FENECON Automatic Off-Grid Switch (AVU)

Version: 2026.07.01

1. Version/revision

Table 1. Version/revision
Version/Revision	Change	Date	Name
2026.2.1	Revision of the original automatic off-grid switch instructions	February 15, 2026	FENECON PM
2026.5.1	Note on clockwise rotating field	04/05/2026	FENECON PM
2026.07.01	Application of ISO warnings	07/01/2026	FENECON PM (MRH)

2. Note on the statutory warranty

The automatic off-grid switch is covered by the statutory warranty of 2 years, starting from receipt of the goods.

3. Symbol conventions

3.1. Symbol conventions — ISO admonitions

	DANGER
Indicates an immediately dangerous situation that — if not avoided — will result in death or serious injury.

	WARNING
Indicates a potentially dangerous situation that — if not avoided — could result in death or serious injury.

	CAUTION
Indicates a potentially dangerous situation that, if not avoided, could result in a minor or moderate injury.

	NOTICE
Indicates a potentially dangerous situation that — if not avoided — could result in property damage.

	SAFETY
These safety instructions identify facilities that are important for rescuing people.

3.2. Symbol conventions — Additional Information

IMPORTANT

Indicates important information that is essential for using the product.

NOTE

Additional information and tips.

4. Structure of Warning Labels

When followed, warning notices help prevent potential injury and property damage, and the signal word indicates the severity of the hazard.

Warnings are structured according to the SAFE method:

Table 2. SAFE Method
Signal Word	Meaning
S	Signal Word (DANGER, WARNING, CAUTION, or NOTICE)
A	(German: Art) — Type and source of the hazard Description of the hazard and its cause.
F	(German: Folge(n)) — Consequence Description of the possible consequences for humans, animals, and the environment that may result from the danger.
E	Escape Recommendations on how to avoid dangers.

	DANGER
DANGER Description of the nature and source of the danger and the possible consequences of failure to comply. Preventive Measures/Prohibitions.

5. Terms and abbreviations

The following terms and abbreviations are used in the assembly and service instructions:

Table 3. Terms and abbreviations
Term/Abbreviation	Meaning
AC	Alternating Current
AVU	Automatic off-grid switch
BMS	Battery Management System
DC	Direct Current
EMS	Energy Management System
Energy Meter	Electricity meter for the inverter at the grid connection point
IBN	Commissioning
GCP	Grid connection point
PE	Protective earth conductor
VDE	German Association for Electrical, Electronic & Information Technologies
Widget	Component of FENECON Online Monitoring

6. Safety

6.1. Intended use

The automatic off-grid switch is a supplement to the electrical energy storage system.
It ensures automated, independent and all-pole switching of the entire household consumption from the mains supply to the emergency power output of the inverter (and back when the mains supply is restored). Manual switching from outside is also possible.

6.2. Qualification of staff

The system must only be installed and maintained by qualified personnel.

6.2.1. Qualified electricians

Qualified electricians include persons who

are able to carry out work on electrical systems due to their technical training, knowledge and experience, including knowledge of all relevant standards and regulations.
have been commissioned and trained by the operator to carry out work on electrical systems.
are familiar with how the automatic off-grid switch works.
recognize hazards and prevent them by taking appropriate protective measures.

6.2.2. Service staff

Service personnel includes manufacturer personnel or specialist personnel instructed and authorized by FENECON GmbH who must be requested by the operator to work on the system (e. g. assembly, repair, maintenance, etc.).

6.3. General information about the automatic off-grid switch

Only qualified electricians are allowed to install the automatic off-grid switch and make cable connections.
The automatic off-grid switch must only be used under the specified conditions (see Technical data AVU-63-21).
Do not immerse the unit in water, moisten it or touch it with wet hands.
Maintain clearances to water sources.
Keep the automatic off-grid switch away from children and animals.
The automatic off-grid switch can cause electric shock and burns due to short-circuit currents.
Keep the automatic off-grid switch away from heat sources.
Do not use the automatic off-grid switch if color changes or mechanical damage are detected during assembly, normal operation and/or storage.
Do not set up or use the automatic off-grid switch near open flames, heaters or high-temperature sources.
The heat can cause insulation to melt.
Do not throw or drop the unit.
Read and adhere to the instructions for installation and operation in order to avoid damage due to incorrect operation.
Do not step on the unit.

6.3.1. Installation, operation and maintenance

Always observe the following safety instructions when installing, operating or maintaining the automatic off-grid switch:

Installation/maintenance work and making cable connections must only be carried out by qualified electricians.
Place on a dry, insulating mat and do not wear any metal objects (e. g. watches, rings and necklaces) during maintenance work/operation.
Use insulated tools and wear personal protective equipment (PPE).
Live contacts with a potential difference must not touch each other.
Measure the battery voltage with a multimeter and ensure that the output voltage is 0 V in Off Mode.
If an abnormality is detected, switch off the device immediately.
Only continue the maintenance work after the causes of the anomaly have been removed.

6.3.2. Fire protection

Do not expose the unit to direct sunlight.
Avoid contact with conductive objects (e. g. wires).

7. Technical data AVU-63-21

7.1. General

Table 4. Technical data — Automatic off-grid switch
Designation		Value/dimension
Installation/ Ambient conditions	IP classification	IP20
	Installation site	Indoor
	Operating altitude above sea level	≤ 2,000 m
	Overvoltage category (OVC)	\|\|
	Protection class	I (PE protective conductor)
	Max. Humidity	95 %
	Installation/operating temperature	-5 °C to +45 °C
	Grid connection	L1, L2, L3, N, PE
	Fuse protection of grid connection	63 A
	Residual current monitoring	Observe requirements depending on installation location
	Rated frequency	50 Hz to 60 Hz
	Output voltage AC	400 V
	Max. Mains operation current	63 A
	Suitable network configurations	TN-S and TT
	Load connection	L1, L2, L3, N
Emergency power operation	Apparent power emergency power operation	15,000 VA
	Max. Current emergency power operation	21.7 A
	Network configuration emergency power operation	TN-S
	Switchover times	Mains failure > Emergency power supply operation: approx. 3 s Emergency power supply operation > Mains operation: approx. 3 s
Certification/guideline	Complete system	CE
General	Width \| Depth \| Height in mm	486 \| 147 \| 486
	Weight, approx.	16 kg
	Degree of soiling	2
	Mechanical force/impact resistance	IK8

7.2. Dimensions

The dimensions are given in mm.

Image 1. Automatic off-grid switch — Dimensions

7.3. Terminal assignment

7.3.1. Overview — Interior

Image 2. Overview — Interior — Automatic off-grid switch

Table 5. Overview — Interior — Automatic off-grid switch
List item	Description
1	3-phase monitoring relay — incl. neutral monitoring
2	DIN rail power supply unit 12 V/DC; 4.5 A; 54 W
3	3 x fuse terminals (incl. fuse) + 1 x feed-through terminal
4	Automatic circuit breaker: C6 miniature circuit breaker; 1-pole
5	Automatic circuit breaker: C32 miniature circuit breaker, 4-pole
6	Gave motorized switch (automatic off-grid switch)
7	Optional: FENECON Home 10 energy meter
8	Feed-through terminal blocks for the power supply of the energy meter
9	Feed-through terminal blocks Internal power supply (12 V)
10	Feed-through terminal blocks for connection to the relay — for LED status query
11	Feed-through terminal blocks for the power supply to the EMS box
12	Feed-through terminals for connecting to the inverter — OnGrid/grid
13	Feed-through terminal blocks for connection to the inverter — OffGrid/emergency power
14	Feed-through terminal block for grid connection
15	Feed-through terminal blocks for connecting consumer loads

7.3.2. Detailed terminal assignment

Image 3. Detailed terminal assignment — Automatic off-grid switch

Table 6. Detailed terminal assignment — Automatic off-grid switch
List item	Description
X16	Optional: Supply FENECON Home 10 energy meter
X12	12 V DC
X10	Relay status
X6	AC supply — EMS box
X4	Inverter — Grid
X5	Inverter — Off-Grid
X1	Grid connection
X7	Load connection

8. General description

The automatic off-grid switch is a supplement to an electrical energy storage system. The unit allows for an unrestricted supply of the consumer loads with max. 43 kW or 63 A in parallel mains operation.
The automatic off-grid switch ensures automated, independent switching of the entire household consumption from the grid supply to the emergency power output of the inverter and back when the grid is restored. Manual switching is also possible. For the installation of the storage system, please follow the instructions of the respective system found here: docs.fenecon.de/en!

The compliant grid disconnection still takes place in the inverter. The automatic off-grid switch is used exclusively for switching the consumer loads.

8.1. System structure

Anlage — schematische Darstellung mit optionalen Komponenten

Image 4. System — Schematic representation with optional components

9. Assembly preparation

9.1. Scope of delivery

The following items are included in the scope of delivery.

Table 7. Scope of delivery — Automatic off-grid switch
Image	Amount	Description
	1	Automatic off-grid switch
	1	Wall bracket
	2	Screw for wall mount
	4	M6 x 67 mm screw and 8 x 60 mm screw anchor for wall mounting
	1	Nut, body washer and spring washer for earthing
	2	Filler plug for unused bolt connections
	1	Assembly and operating instructions

9.2. Tools required

The following tools are required for assembly of the system components:

Table 8. Tools required
Image	Description	Image	Description
	Pencil		Spirit level
	Impact drill or cordless screwdriver		Screwdriver set
	Meter stick		Side cutter
	Allen key, 3 mm		Set of flat spanners
	Crimping tool		Multimeter
	Pliers for cable glands		Protective eyewear
	Safety footwear		Dust mask
	Rubber mallet		Vacuum cleaner
	Wire stripper		Protective gloves
	Torque wrench		Stripping knife

The tool is not included in the scope of delivery.

10. Assembly — Automatic Off-grid Switch

Before installation, carefully check whether the packaging and the product are damaged and whether all accessories listed in the scope of delivery are included. In the event that accessories are missing or damaged, contact the manufacturer/dealer.

10.1. Warnings and Safety Instructions

	DANGER
Electric shock from live parts Death or serious injury to the body and limbs due to electric shock when touching live cables connected to the system. Before beginning work, disconnect the inverter, the BMS box, the battery modules, and the automatic off-grid switch from the power supply and secure them against being switched back on. Wait at least 5 minutes after shutting down the system before beginning work on the inverter. Please follow the safety instructions provided by FENECON GmbH in the Safety section. Do not touch any exposed live parts or cables. Do not remove the terminal strip with connected DC wires from the slot under load. Wear appropriate PPE during all work.

DANGER

Electric shock from live parts
Death or serious injury to the body and limbs due to electric shock when touching live cables connected to the system.

Before beginning work, disconnect the inverter, the BMS box, the battery modules, and the automatic off-grid switch from the power supply and secure them against being switched back on.
Wait at least 5 minutes after shutting down the system before beginning work on the inverter.
Please follow the safety instructions provided by FENECON GmbH in the Safety section.
Do not touch any exposed live parts or cables.
Do not remove the terminal strip with connected DC wires from the slot under load.
Wear appropriate PPE during all work.

	DANGER
Death or serious injury from electric shock Installation must be performed only by a licensed electrician. Connection or installation must be performed by qualified specialists after ensuring that the system is de-energized and free of current! It is essential to verify that the circuit is de-energized! Always observe the accident prevention regulations and VDE regulations!

	DANGER
Electric arcs caused by short-circuit currents Death or serious injuries to the body and limbs due to burns caused by heat generation and electric arcs resulting from short-circuit currents in the battery modules. Before performing any work on the battery modules, disconnect them from the power supply. Follow all safety instructions provided by the battery manufacturer.

	DANGER
Death or serious injury to the body and limbs due to electric shock when touching the live housing of a measuring instrument + A power surge can damage a measuring instrument and cause a voltage to be present on the instrument’s housing. Use only measuring instruments with a DC input voltage range of at least 1000 V.

	DANGER
Fire and explosion Death or serious injury to the body and limbs due to fire or explosion; in the event of a malfunction, a flammable gas mixture may form inside the components and modules. Operating the controls in this condition may cause a fire or trip an explosion inside the product. If an error occurs, do not take any direct action on the system. Make sure that unauthorized persons do not have access to the system. Disconnect the battery modules from the inverter using the DC fuse on the battery tower. Turn off the AC miniature circuit breaker, or if it has already tripped, leave it off and secure it to prevent it from resetting. Perform work on the inverter (e. g., troubleshooting, repairs) only while wearing PPE designed for handling hazardous substances (e. g., protective gloves, eye and face protection, and respiratory protection).

DANGER

Fire and explosion
Death or serious injury to the body and limbs due to fire or explosion; in the event of a malfunction, a flammable gas mixture may form inside the components and modules. Operating the controls in this condition may cause a fire or trip an explosion inside the product.

If an error occurs, do not take any direct action on the system.
Make sure that unauthorized persons do not have access to the system.
Disconnect the battery modules from the inverter using the DC fuse on the battery tower.
Turn off the AC miniature circuit breaker, or if it has already tripped, leave it off and secure it to prevent it from resetting.
Perform work on the inverter (e. g., troubleshooting, repairs) only while wearing PPE designed for handling hazardous substances (e. g., protective gloves, eye and face protection, and respiratory protection).

	WARNING
Weight of the automatic off-grid switch Injuries to the body and limbs caused by crushing during a fall while transporting or performing assembly work on the automatic off-grid switch. Handle the automatic off-grid switch with care when transporting and lifting it. Be aware of the weight of the automatic off-grid switch and its center of gravity. Wear appropriate PPE when performing any work on the AVU.

WARNING

Weight of the automatic off-grid switch
Injuries to the body and limbs caused by crushing during a fall while transporting or performing assembly work on the automatic off-grid switch.

Handle the automatic off-grid switch with care when transporting and lifting it.
Be aware of the weight of the automatic off-grid switch and its center of gravity.
Wear appropriate PPE when performing any work on the AVU.

	CAUTION
DANGER due to improper use Improper use of the product may compromise the protection provided by the device. Use the product only as intended and not outside the scope of use defined by the manufacturer.

	NOTICE
Sand, Dust, and Moisture The ingress of sand, dust, and moisture can damage the automatic off-grid switch and impair its operation. Prevent sand, dust, and moisture from entering the automatic off-grid switch.

	NOTICE
Damage to the automatic off-grid switch caused by electrostatic charge Touching electronic components can damage or destroy the automatic off-grid switch due to electrostatic discharge. Ground yourself before touching any component. When handling electronic components, wear appropriate PPE (e. g. antistatic shoes and gloves).

	NOTICE
Cleaning agents The use of cleaning agents can damage the automatic off-grid switch and parts of the automatic off-grid switch. Clean the battery towers and all parts of the automatic off-grid switch using only a cloth dampened with clean water.

10.2. Pictograms

Pictograms on the system indicate dangers, prohibitions and instructions. Illegible or missing pictograms must be replaced by new ones.

Table 9. Pictograms
Pictogram	Meaning	Description
	Warning: Dangerous Electrical Voltage	Pictogram on the housing and labeling of components where it is not immediately apparent that they contain electrical equipment that could pose a risk of electric shock.
	General warning symbol
	Warning Regarding Hazards Associated with Battery Charging	Pictogram on the housing and labeling of components where it is not immediately apparent that they contain electrical equipment that could pose a risk due to battery charging.
	No open flames; Fire, open ignition sources, and smoking prohibited	Pictogram on the housing and labeling of components where it is not immediately apparent that they contain electrical equipment that could pose a risk due to open flames, fire, open ignition sources, and smoking.
	Protective grounding symbol
	Separate Collection of Electrical and Electronic Equipment
	Follow instructions
	Use protective headgear
	Use protective footwear
	Use protective gloves
	CE mark
	Product is recyclable.

10.3. Operating materials/equipment

10.3.1. Electrolyte solution of the battery modules

Electrolyte solution is used in the battery modules (lithium iron phosphate).
The electrolyte solution in the battery modules is a clear liquid and has a characteristic odor of organic solvents.
The electrolyte solution is flammable.
The electrolyte solution in the battery modules is corrosive.
Contact with electrolyte solution can cause severe burns to the skin and damage to the eyes.
Do not inhale the vapors.
If the electrolyte solution is swallowed, induce vomiting.
Leave the contaminated area immediately after inhaling the vapors.
Eye and skin contact with leaked electrolyte solution must be avoided.
- After skin contact: Immediately wash skin thoroughly with neutralizing soap and consult a doctor if skin irritation persists.
- After eye contact: Immediately flush eye(s) with running water for 15 minutes and seek medical advice.

Delayed treatment can cause serious damage to health.

10.3.2. Electrical equipment

Work on electrical equipment must only be carried out by qualified electricians.
The five safety rules must be observed for all work on electrical components:
1. Disconnect.
2. Secure against restarting.
3. Check that there is no voltage.
4. Earth and short-circuit.
5. Cover or shield neighboring live parts.
Maintenance work must only be carried out by trained specialist personnel (service personnel).
Before starting work, carry out visual checks for insulation and housing damage.
The system must never be operated with faulty or non-operational electrical connections.
To avoid damage, lay supply lines without crushing and shearing points.
Only insulated tools must be used for maintenance on uninsulated conductors and terminals.
Control cabinets (e. g. inverter housing) must always be kept locked. Only authorized personnel with appropriate training and safety instructions (e. g. service personnel) should be allowed access.
The inspection and maintenance intervals for electrical components specified by the manufacturer must be observed.
To avoid damage, lay supply lines without crushing and shearing points
If the power supply is disconnected, specially marked external circuits may still be live!
Some equipment (e. g. inverters) with an electrical intermediate circuit may still carry dangerous residual voltages for a certain period of time after disconnection. Before starting work on these systems, check that they are de-energized.

10.4. Personal protective equipment

Depending on the work on the system, personal protective equipment must be worn:

Protective footwear
Protective gloves, cut-resistant if necessary
Protective eyewear
Protective headgear

10.5. Spare and wear parts

The use of spare and wear parts from third-party manufacturers can lead to risks. Only original parts or spare and wear parts approved by the manufacturer must be used. The instructions for spare parts must be observed. Further information can be found in the wiring diagram.

Further information must be requested from the manufacturer.

10.6. IT security

FENECON systems and their applications communicate and operate without an internet connection. The individual system components (inverters, batteries, etc.) are not directly connected to the internet or accessible from the Internet. Sensitive communications via the internet are processed exclusively via certificate-based TLS encryption.

Access to the programming levels is not barrier-free and is accessible at different levels depending on the qualifications of the operating personnel. Safety-relevant program changes require additional verification.

FENECON processes energy data of European customers exclusively on servers in Germany and these are subject to the data protection regulations applicable in this country.

The software used is checked using automated tools and processes established during development in order to keep it up to date and to rectify security-relevant vulnerabilities at short notice. Updates for FEMS are provided free of charge for life.

10.7. Installation conditions and clearances at the installation site

Image 5. Recommended clearances at the installation site — AVU unit

Installation conditions

The wall must be stable enough for mounting the automatic off-grid switch and must not be flammable.
The room should be permanently ventilated.
Maintain a clearance of at least 300 mm above the automatic off-grid switch.
Maintain a clearance of at least 300 mm below the automatic off-grid switch (cable ducts are not measured here).
Maintain a clearance of at least 1000 mm from the front of the automatic off-grid switch.
Keep at least 100 mm clearance to the left of the automatic off-grid switch.
Maintain a clearance of at least 400 mm to the right of the automatic off-grid switch.

10.8. Wall mounting

Proceed as follows to install the automatic off-grid switch on a wall:

Assembly of the wall bracket

Please observe the minimum clearances.

Mark the holes for the wall mount and drill them (Ø 8 mm, depth 80 mm).

Attach the wall mount to the wall. Screw anchors and bolts are included for this purpose. Always check the type of wall to determine whether the screw anchors can be used.

Hang the automatic off-grid switch on the wall mount using the bracket on the back.
Then secure it on the left side using the provided bolts.

Loosen the eight bolts on the front and remove the cover (Torx T20).

11. Electrical installation

11.1. Overview of the connections

Gesamtübersicht der Anschlussverbindungen

Image 6. Overview of the connections

Table 10. Components of the general overview
List item	Description
1	Bi-directional meter from energy supplier
2	Earth circuit connector or earthing connection
3	Fuse protection of the consumer loads with RCD type A and suitable MCBs
4	Consumer loads/emergency power consumers
5	EMS box connection (uninterruptible) (AC supply to the EMS box)
6	Automatic off-grid switch (AVU)
7	Inverter
8	External status signal
9	Grid
10	Optional: FENECON Home 10 energy meter (energy flow direction meter)

Clockwise rotating field mandatory
The automatic off-grid switch is designed for operation with a clockwise rotating field.
The automatic off-grid switch may malfunction with a left-hand rotating field.

Before installation, use a two-pole voltage tester to check whether a clockwise rotating field is present.

Between positions 1 and 6:

In addition, the currently valid national regulations and the specifications of the relevant grid operator must be observed. (If an RCD is required by the grid operator, an RCD type A with a tripping current of 300 mA is recommended; at 30 mA, unwanted shutdowns may occur).
The currently valid national regulations, the specifications of the associated grid operator and the manufacturer’s specifications must be complied with.

Optional earthing connection:
Depending on the network configuration, earthing can be done via the supply cable or through the earth circuit connector.

11.2. Connection between the individual components

11.2.1. Connection to the inverter

Image 7. AC connection — Inverter

Table 11. Components for the inverter connection (not included in the scope of delivery)
List item	Description
1	Inverter
X4	Grid connection inverter to X4 (on-grid) (5 x 4 mm²)
X5	Emergency power connection inverter to X5 (OFF-Grid) (5 x 4 mm²)

11.2.2. Connection to the EMS box

Image 8. AC supply to the EMS box

Table 12. Components — EMS box connection (not included in the scope of delivery)
List item	Description
1	EMS box (AC connection)
X6	AC supply connection — EMS box to X6 (3 x 1.5 mm²)

11.2.3. Energy meter connection without external generators

Image 9. Energy meter in the automatic off-grid switch

Table 13. Components for the SmartMeter connection (optional)
List item	Description
1	Grid
2	Bi-directional meter of the energy supply company (grid operator)
3	Power supply from energy meter X16 (4 x 1.5 mm²)
4	Split-core CT (directly behind the grid operator’s meter) already pre-assembled on the Energy Meter
5	Inverter
6	Modbus connection between Energy Meter and inverter

If you have an existing system with an Energy Meter already installed, the Energy Meter does not need to be modified.

11.2.4. Connection of an external status display (optional)

Image 10. External status display connection

Table 14. Components for an external status display (optional)
List item	Description
1	External status display (three states, each state: 12 V DC/100 mA)

The external status display is a separate installation by the installer.
No product is provided for this, neither as part of the scope of delivery nor as an option.

11.3. Electrical installation with external AC generator

11.3.1. Overview of the connections

Installationsübersicht mit externem AC-Erzeuger

Image 11. Installation overview with external AC generator

Table 15. Components of the complete overview with external AC generator
List item	Description
1	Bi-directional meter of the energy supply company (grid operator)
2	Earth circuit connector or earthing connection
3	Fuse protection of the consumer loads with RCD type A and suitable MCBs
4	Consumer loads/emergency power consumers
5	EMS box connection (uninterruptible) (AC supply to the EMS box)
6	Automatic off-grid switch (AVU)
7	Inverter
8	External status signal
9	Grid
10	FENECON Home 10-Energy meter (energy flow direction meter)
11	External AC generator

PV inverters, CHP units, small wind turbines or other generators in the existing sub-distribution board must be installed at point 11.

11.3.2. Energy meter connection with external AC generator

Anschluss Energy Meter mit externem AC-Erzeuger

Image 12. Energy meter connection with external AC generator

Table 16. Components for the smart meter connection & external AC generator (optional)
List item	Description
1	Grid
2	Bi-directional meter of the energy supply company (grid operator)
3	FENECON Home 10 Energy meter (voltage supply from X16: 4 x 1.5 mm²)
4	Split-core CT (directly behind AC generator) already pre-assembled on the smart meter
5	FENECON Inverter
6	Modbus between Smart Meter and FENECON inverter
7	AC generator (directly behind the grid operator’s meter and behind the split-core CTs of the energy meter)

If you have an existing system with an Energy Meter already installed, the Energy Meter does not need to be modified.

12. Display and operation

12.1. LED status display

Image 13. LED status display

Table 17. LED status display
List item	Description
Blue	The system is in automatic mains operation
Red	The system is in emergency power mode (automatic/manual)
Green	The system is in manual mains operation

12.2. Operating activities

Image 14. Operating activities

Table 18. Automatic off-grid switch operation
List item	Switch position	Description
1	Press LED switch	Motor in switch 2 is switched off (LED lights up green)
2	Put on switch and turn	The mode can be changed manually. Pos. 1: Mains operation (LED lights up green) Pos. 0: Off Pos. 2: Emergency power mode (LED lights up red)

13. Initial commissioning

13.1. Checking the installation, connections and cabling

Check the system as follows before initial commissioning:

All components (clearances, environment, mounting) are installed correctly.
All internal wiring is complete and properly connected.
All external supply lines (power supply, communication cable) are properly connected.
All connected loads are matched to the system and the necessary settings have been made.
All necessary tests of the system were carried out in accordance with the standards.

13.2. Settings on the monitoring relay

Image 15. Settings on the monitoring relay (depending on variant)

Table 19. Settings on the monitoring relay
List item	Description
1	Neutral monitoring (with or without) Setpoint: With neutral
2	Switch-off delay (between 0.5 and 60 seconds) Setpoint: 0.5 seconds or 0.1 seconds
3	Maximum voltage (between 380 and 480 V) Setpoint: 450 V
4	Nominal voltage (between 4 and 25 %) Setpoint: 15 %
5	Minimum voltage (between 300 and 400 V) Setpoint: 350 V
6	Rotary function switch for various pick-up and drop-out voltages Setpoint: U2 - 3Ph

13.3. Switching on the miniature circuit breakers

The miniature circuit breakers in the automatic off-grid switch must then be switched on.

Einsichern der Leitungsschutzschalter in der AVU

Image 16. Racking in the miniature circuit breakers in the automatic off-grid switch

13.4. Final assembly

Proceed as follows for final assembly of the automatic off-grid switch:

Installation of the cover

Connect the plug of the push-button in the cover to the plug in the automatic off-grid switch.

Attach the grounding wire in the automatic off-grid switch to the grounding bolt on the mounting plate as shown. Use the enclosed body washer, spring washer and nut (M8) for this. Then tighten with a torque wrench to 8.9 Nm (wrench size 13).

Replace the cover and tighten the 8 bolts (Torx T20).

13.5. Switching the system on/off

13.5.1. Switch on

The system must be switched on in the following order:

Switch on the main fuse.
Switch on the inverter.
Switch the battery energy storage system.
Check whether the push-button is set to automatic mode.

The automatic off-grid switch now automatically switches to grid operation when the grid is connected.

If back-up power has not yet been activated on the Home system, the commissioning must be performed again to activate the back-up power function.

13.5.2. Switching off

If the system must be taken out of operation, please proceed in the following order:

Switch off the battery energy storage system.
Switch off the inverter.
Switch off the main fuse on the meter.
Switch off the circuit breaker in the automatic off-grid switch.

Make sure the device is de-energized before dismantling or modifying it!

13.6. Replacing the cartridge fuses

If a cartridge fuse is defective, it must be replaced as shown in the following image.

DANGER

DANGER of electric shock due to residual voltage when the inverter/grid is turned on! Replacing the fuse requires opening the automatic off-grid switch and may involve contact with live parts.

The fuse must be replaced only by qualified electricians!
Verify that the automatic off-grid switch is de-energized before opening it.
Follow the 5 VDE safety rules!
- Disconnect
- Secure against accidental restart
- Verify the absence of voltage
- Ground & short-circuit
- Cover or shield adjacent live parts

Image 17. Replacing the cartridge fuses

Only cartridge fuses, medium time delay (250 V/6.3 A), are to be used! (Littlefuse 021506.3)

Electrical data

Materials

Housing:
Caps: nickel-plated brass
Cables: tin-plated copper

Clamping strength

MIL-STD-202, method 211, test condition A

Solderability

MIL-STD-202 Method 208

Marking of the product

Cable 1: Brand logo, current and voltage values Cable 2: Test seal

Operating temperature

-55 °C to +125 °C

Thermal shock test

MIL-STD-202, method 107, test condition B (5 cycles, -65 °C to +125 °C)

Vibration test

MIL-STD-202, method 201

Humidity test

MIL-STD-202, method 103, test condition A (high humidity (95 %) and elevated temperature (40 °C) for 240 hours)

Salt spray test

MIL-STD-202, method 101, test condition B

14. FENECON Service

If the system malfunctions, contact FENECON Service:

Phone: +49 (0) 9903 6280 0

E-mail: service@fenecon.de

Our service hours:
Mon. to Thurs.: 8 a.m. to 12 p.m. | 1 p.m. to 5 p.m.
Fri.: 8 a.m. to 12 p.m. | 1 p.m. to 3 p.m.

15. Technical maintenance

15.1. Tests and inspections

No regular tests and inspections need to be carried out on the system in accordance with the normative specifications.

15.2. Maintenance work

No regular maintenance work needs to be carried out on the system in accordance with the normative specifications.

15.3. Repairs

Contact FENECON Service in the event of defective components.

16. Handover to the operator

16.1. Information for the operator

The following information must be provided to the operator:

Table 20. Information for the operator
Component	Information/Document	Comment
System	Assembly and operating instructions

17. Dismantling and disposal

17.1. Dismantling

Only have the automatic off-grid switch dismantled by authorized qualified electricians.

17.2. Disposal

The automatic off-grid switch must not be disposed of in normal household waste.
Disposal of the product must comply with local regulations for disposal.