Fronius Backup Controller 3P-35A Operating Instructions

1. Safety rules

1. Safety rules
2. Safety rules

1. Safety rules
2. Safety rules

• Injury or death to the operator or a third party
• Damage to the device and other material assets belonging to the operating company.

• Be suitably qualified
• Have knowledge of and experience in dealing with electrical installations and
• Have fully read and precisely followed these Operating Instructions

The Operating Instructions must always be at hand wherever the device is being used. In addition to the Operating Instructions, attention must also be paid to any generally applicable and local regulations regarding accident prevention and environmental protection.

• Must be kept in a legible state
• Must not be damaged
• Must not be removed
• Must not be covered, pasted or painted over

The terminals can reach high temperatures.

• Injury or death to the operator or a third party
• Damage to the device and other material assets belonging to the operating company

Any safety devices that are not fully functional must be repaired by an authorised specialist before the device is switched on.

Never bypass or disable protection devices.

For the location of the safety and danger notices on the device, refer to the section headed "General remarks" in the Operating Instructions for the device.

Any equipment malfunctions which might impair safety must be remedied before the device is turned on.

This is for your personal safety!

1. Safety rules
2. Safety rules

Operation or storage of the device outside the stipulated area will be deemed as not in accordance with the intended purpose. The manufacturer accepts no liability for any damage resulting from improper use.

1. Safety rules
2. Safety rules

The servicing information contained in these operating instructions is intended only for the use of qualified service engineers. An electric shock can be fatal. Do not carry out any actions other than those described in the documentation. This also applies to qualified personnel.

All cables and leads must be secured, undamaged, insulated and adequately dimensioned. Loose connections, scorched, damaged or inadequately dimensioned cables and leads must be immediately repaired by authorised personnel.

Maintenance and repair work must only be carried out by an authorised specialist.

It is impossible to guarantee that bought-in parts are designed and manufactured to meet the demands made on them, or that they satisfy safety requirements. Use only original spare parts (also applies to standard parts).

Do not carry out any alterations, installations, or modifications to the device without first obtaining the manufacturer's permission.

Components that are not in perfect condition must be changed immediately.

1. Safety rules
2. Safety rules

In certain cases, even though a device complies with the standard limit values for emissions, it may affect the application area for which it was designed (e.g., when there is equipment that is susceptible to interference at the same location, or if the site where the device is installed is close to either radio or television receivers). If this is the case, then the operator is obliged to take action to rectify the situation.

1. Safety rules
2. Safety rules

• backing up any changes made to the factory settings
• saving and retaining personal settings

1. Safety rules
2. Safety rules

Copyright of these operating instructions remains with the manufacturer.

Text and illustrations were accurate at the time of printing, subject to change.
We are grateful for suggestions for improvement and information regarding any discrepancies in the operating instructions.

The Fronius Backup Controller is a fixed piece of equipment designed for use in public grids with TN-C-S/TN-S systems. Its main function is to automatically and securely disconnect all connected loads and generators from the public grid in the event of a grid failure or grid malfunction in accordance with the specifications of the grid operator. As soon as grid stability has been restored, the loads and generators are automatically reconnected to the public grid.

1. Application: The Fronius Backup Controller is required for systems with storage batteries to enable automatic backup power switching.
2. Installation: The Fronius Backup Controller is installed either on an indoor DIN rail or in special enclosures with corresponding IP protection, depending on the environmental conditions.
3. Safety precautions: In conjunction with a Fronius Smart Meter, corresponding back-up fuses must be selected to suit the cable cross-sections of the copper conductors and the maximum current of the Fronius Backup Controller.
4. Intended use: The Fronius Backup Controller must only be operated in accordance with the specifications in the enclosed documentation and in accordance with local laws, regulations, provisions, standards and within the limits of technical possibilities. Any use of the product other than as described under intended use shall be deemed to be not in accordance with intended use.
5. Documentation: The available documentation forms part of the product and must be read, observed and kept in good condition. It must also be accessible at all times at the place of installation. The available documents do not replace regional, state, provincial or national laws, or regulations or standards that apply to the installation, electrical safety and use of the product. Fronius International GmbH assumes no responsibility for compliance with or non-compliance with these laws or regulations in connection with the installation of the product.
6. Interventions and modifications: Interventions in the Fronius Backup Controller, e.g. modifications and alterations, are not permitted. Unauthorised interventions will void the warranty and warranty claims and, as a rule, void the user's authority to operate the equipment. The manufacturer shall not be liable for any damage resulting from such use.
7. Reasonably foreseeable misuse: The Fronius Backup Controller is not suitable for supplying power to life-sustaining medical equipment.

1. General information

The Fronius Backup Controller is a fixed piece of equipment designed for use in public grids with TN-C-S/TN-S systems. Its main function is to automatically and securely disconnect all connected loads and generators from the public grid in the event of a grid failure or grid malfunction in accordance with the specifications of the grid operator. As soon as grid stability has been restored, the loads and generators are automatically reconnected to the public grid.

1. Application: The Fronius Backup Controller is required for systems with storage batteries to enable automatic backup power switching.
2. Installation: The Fronius Backup Controller is installed either on an indoor DIN rail or in special enclosures with corresponding IP protection, depending on the environmental conditions.
3. Safety precautions: In conjunction with a Fronius Smart Meter, corresponding back-up fuses must be selected to suit the cable cross-sections of the copper conductors and the maximum current of the Fronius Backup Controller.
4. Intended use: The Fronius Backup Controller must only be operated in accordance with the specifications in the enclosed documentation and in accordance with local laws, regulations, provisions, standards and within the limits of technical possibilities. Any use of the product other than as described under intended use shall be deemed to be not in accordance with intended use.
5. Documentation: The available documentation forms part of the product and must be read, observed and kept in good condition. It must also be accessible at all times at the place of installation. The available documents do not replace regional, state, provincial or national laws, or regulations or standards that apply to the installation, electrical safety and use of the product. Fronius International GmbH assumes no responsibility for compliance with or non-compliance with these laws or regulations in connection with the installation of the product.
6. Interventions and modifications: Interventions in the Fronius Backup Controller, e.g. modifications and alterations, are not permitted. Unauthorised interventions will void the warranty and warranty claims and, as a rule, void the user's authority to operate the equipment. The manufacturer shall not be liable for any damage resulting from such use.
7. Reasonably foreseeable misuse: The Fronius Backup Controller is not suitable for supplying power to life-sustaining medical equipment.

1. General information

Technical data and markings are located on the Fronius Backup Controller. These must NOT be removed or painted over.

Markings:
	CE mark – confirms compliance with applicable EU directives and regulations.
	WEEE mark – waste electrical and electronic equipment must be collected separately and recycled in an environmentally sound manner in accordance with the European Directive and national law.
	RCM mark – tested in accordance with the requirements of Australia and New Zealand.

1. General information

(1)	Fronius Backup Controller
(2)	Quick Start Guide
(3)	Backup power warning notice

1. General information

	PV module generates direct current
	Fronius GEN24 inverter converts direct current into alternating current and charges the battery (battery charging is only possible with Fronius GEN24 Plus inverters). The integrated system monitoring enables the inverter to be integrated into a network by means of WLAN.
	Fronius Backup Controller automatically and securely disconnects all connected loads and generators from the public grid in the event of a grid failure or grid malfunction in accordance with the specifications of the grid operator. As soon as grid stability has been restored, the loads and generators are automatically reconnected to the public grid.
	Inverter in the system e. g. Fronius Primo, Fronius Symo, etc.
	Primary meter records the system's load curve and provides measurement data for energy profiling in Fronius Solar.web. The primary meter also controls the dynamic power of feeding in.
	Utility meter measures the measurement data relevant for billing amounts of energy (in particular kilowatt hours of energy sourced from the grid and energy fed into the grid). Based on the relevant billing data, the electricity retailer will invoice the energy sourced from the grid and the purchaser of the surplus energy will reimburse the energy fed into the grid.
	Grid supplies the loads in the system if insufficient power is being generated by the PV modules or supplied by the battery.
	Battery is coupled to the inverter on the direct current side, and stores electrical energy.
	Loads in the system e. g. washing machine, lamps, TV, etc.

1. General information

The Fronius Backup Controller must be installed in the following position in the system.

1. General information

1. Control elements and connections

(1)	1-pin push-in terminal for the neutral conductor connection to the Fronius Smart Meter (max. 1 A).
(2)	Push-in terminal for digital inputs/outputs. (I/Os).
(3)	3-pin push-in terminal for the supply from the public grid.
(4)	4-pin push-in terminal for the loads in the backup power circuit.
(5)	4-pin push-in terminal for the generators in the backup power circuit.

1. Control elements and connections

1. Control elements and connections

The LED status indicator shows the operating status and the Fronius Backup Controller.

Symbol	LED status	Description
	Lights up green	The "Grid" LED indicates that all connected loads and generators in the backup power circuit are being supplied by or are connected to the public grid.
	Lights steady blue	The "Full Backup" LED indicates that all connected loads and generators in the backup power circuit are safely disconnected from the public grid and that the Full Backup power supply is active.

1. Installation

Single-core	Multi-stranded	Fine-stranded	Fine-stranded with ferrule and collar	Fine-stranded with ferrule without collar

1. Installation
2. Prerequisites for connecting the Backup Controller

Single-core	Multi-stranded	Fine-stranded	Fine-stranded with ferrule and collar	Fine-stranded with ferrule without collar

1. Installation
2. Prerequisites for connecting the Backup Controller

Round copper conductors can be connected to the terminals as described below.

Push-in terminals for the supply from the public grid.* Select a sufficiently large cable cross-section based on the actual connected output.
2.5 - 10 mm2	2.5 - 10 mm2	2.5 - 10 mm2	2.5 - 6 mm2	2.5 - 6 mm2

Push-in terminals for the loads/generators in the backup power circuit.* Select a sufficiently large cable cross-section based on the actual connected output.
2.5 - 10 mm2	2.5 - 10 mm2	2.5 - 10 mm2	2.5 - 6 mm2	2.5 - 6 mm2

Push-in terminal for the neutral conductor connection to the Fronius Smart Meter (max. 1 A)
1 - 4 mm2	1 - 4 mm2	1 - 4 mm2	1 - 2.5 mm2	1 - 2.5 mm2

1. Installation
2. Prerequisites for connecting the Backup Controller

Round copper conductors can be connected to the push-in terminals for digital inputs/outputs (I/Os) as described below.

IO connections with push-in terminal
Max. distance	Stripping length					Cable recommendation
30 m * 32 yd *	10 mm  0.39 inch	0.14 - 1.5 mm2 AWG 26 - 16	0.14 - 1.5 mm2 AWG 26 - 16	0.14 - 1 mm2 AWG 26 - 18	0.14 - 1.5 mm2 AWG 26 - 16	Single conductor possible

1. Installation
2. Prerequisites for connecting the Backup Controller

• Upstream overcurrent protection as specified in chapter Technical data on page (→).
• A surge protective device (SPD) as specified in chapter Technical data on page (→).

1. Installation

1. Installation
2. Installation

1. Installation
2. Installation

1

Turn off the automatic circuit breaker. Set the DC disconnector to the "Off" switch position.

2

Switch off the battery connected to the inverter.

Wait for the capacitors of the inverter to discharge (2 minutes).

1. Installation
2. Installation

The Fronius Backup Controller can be mounted on a 35 mm DIN rail. The housing comprises 8 modules according to DIN 43880 and conforms to unit size 2.

1. Installation
2. Installation

1

Strip the insulation of the single conductors by 12 mm.
Select the cable cross-section in accordance with the instructions in Permissible cables for the electrical connection from page (→).

2

Lift the operating levers of the terminals to open. Insert the stripped single conductors into the slot provided in the terminal, in each case as far as it will go.

3

Close the terminal operating levers until they engage.

1. Installation
2. Installation

1

Strip the insulation of the single conductors by 12 mm.
Select the cable cross-section in accordance with the instructions in Permissible cables for the electrical connection from page (→).

2

Lift the operating levers of the terminals to open. Insert the stripped single conductors into the slot provided in the terminal, in each case as far as it will go.

IMPORTANT!
The neutral conductor must be connected to the public grid.

3

Close the terminal operating levers until they engage.

1. Installation
2. Installation

1

Strip the insulation of the single conductors by 12 mm.
Select the cable cross-section in accordance with the instructions in Permissible cables for the electrical connection from page (→).

2

Lift the operating levers of the terminals to open. Insert the stripped single conductors into the slot provided in the terminal, in each case as far as it will go.

IMPORTANT!
The neutral conductor must be connected to the public grid.

3

Close the terminal operating levers until they engage.

1. Installation
2. Installation

1

Strip the insulation of the single conductors by 10 mm.
Select the cable cross-section in accordance with the instructions in Permissible cables for the electrical connection from page (→).

2

Lift the operating levers of the terminals to open. Insert the stripped single conductor into the slot provided in the terminal as far as it will go.

3

Close the operating lever of the terminal until it engages.

1. Installation
2. Installation

• Use network cables of type CAT5 STP or higher.
• Use a mutual twisted cable pair for corresponding data lines.
• Use double-insulated or sheathed data lines when they are close to bare conductors.
• Use shielded twisted pair cables to avoid faults.

1. Start-up

1

Switch on the battery connected to the inverter.

2

Set the DC disconnector to the "On" switch position. Switch on the automatic circuit breaker.

1. Start-up

IMPORTANT!
Settings under the "Device configuration" → "Functions and I/Os" menu item are only to be made by trained and qualified personnel! The service password must be entered in order to access the "Device configuration" menu item.

1. Start-up

The Full Backup backup power mode has been configured.

1. Start-up

• During the initial installation and configuration
• After working on the switch cabinet
• During ongoing operation (recommendation: at least once a year)

For test mode, a battery charge of min. 30% is recommended.

A description on how to run test mode can be found in the backup power checklist (https://www.fronius.com/en/search-page, item number: 42,0426,0365).

Clean the Backup Controller as required with a damp cloth.
Do not use cleaning agents, abrasives, solvents or similar to clean the Backup Controller.

1. Appendix

Clean the Backup Controller as required with a damp cloth.
Do not use cleaning agents, abrasives, solvents or similar to clean the Backup Controller.

1. Appendix

Maintenance and servicing may only be carried out by Fronius-trained service technicians.

1. Appendix

Waste electrical and electronic equipment must be collected separately and recycled in an environmentally responsible manner in accordance with the EU Directive and national law. Used equipment must be returned to the distributor or through a local, authorised collection and disposal system. Correct disposal of the used device promotes sustainable recycling of resources and prevents negative effects on health and the environment.

• Collect separately
• Observe locally valid regulations
• Compress the cardboard box to reduce volume

1. Appendix

Detailed, country-specific warranty conditions are available at www.fronius.com/solar/warranty.

To obtain the full warranty period for your newly installed Fronius product, please register at www.solarweb.com.

1. Appendix

1. Circuit diagram

1. Circuit diagram
2. Fronius Backup Controller 3-pin separation, e.g. Austria

1. Dimensions

1. Dimensions
2. Dimensions - Fronius Backup Controller 3P-35A