Fronius Backup Controller 3P-35A Operating instructions

1. General information

1. General information
2. Safety rules

1. General information
2. Safety rules

• serious or fatal injury to the operator or a third party,
• and 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 kept on hand wherever the device is being used. In addition to the Operating Instructions, all applicable local rules and regulations regarding accident prevention and environmental protection must also be followed.

• must be kept in a legible state
• must not be damaged/marked
• must not be removed
• must not be covered, pasted, or painted over.

The terminals can reach high temperatures.

• serious or fatal injury to the operator or a third party,
• and damage to the device and other material assets belonging to the operating company.

Any safety devices that are not functioning properly must be repaired by an authorized 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” in the Operating Instructions for the device.

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

Your personal safety is at stake!

1. General information
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. General information
2. Safety rules

The information contained in these operating instructions is intended only for qualified personnel. 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 must be secured, undamaged, insulated, and adequately dimensioned. Loose connections, damaged or under-dimensioned cables must be repaired immediately by an authorized specialist company.

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

It is impossible to guarantee that third-party parts are designed and manufactured to meet the demands made on them, or that they satisfy safety requirements. Only use original spare parts.

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

Replace any damaged components or have them replaced immediately.

1. General information
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, the operator is obliged to take action to rectify the situation.

1. General information
2. Safety rules

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

1. General information
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 on any discrepancies in the operating instructions.

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 (see Fronius Backup Controller3P-35A on page (→)).
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. Unauthorized 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.

1. General information
2. General

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 (see Fronius Backup Controller3P-35A on page (→)).
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. Unauthorized 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.

1. General information
2. General

The backup power switching is not suitable to supply loads that require an uninterruptible supply (e.g., IT networks, life-sustaining medical devices).

1. General information
2. General

Technical data and markings are located on the Fronius Backup Controller. This information must be kept in a legible condition and must not be removed, covered, pasted or painted over. These must not be removed or painted over.

Labelling
	CE label – confirms compliance with applicable EU directives and regulations.
	WEEE marking – 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 marking – tested according to the requirements of Australia and New Zealand.

1. General information
2. General

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

1. General information
2. General

		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 WiFi.
		Fronius Symo Hybrid inverter Converts the direct current into alternating current and charges the battery. The integrated system monitoring enables the inverter to be integrated into a network by means of WiFi.
		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
		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 for 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

1. General information
2. General

The Fronius Backup Controller must be installed in the backup power circuit of the photovoltaic system.

Fronius GEN24 Inverter

Fronius Symo Hybrid inverter

1. General information
2. General

1. General information

(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)	8-pin push-in terminal for loads/generators in the backup power circuit.

1. General information
2. Operating controls 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)	8-pin push-in terminal for loads/generators in the backup power circuit.

1. General information
2. Operating controls and connections

1. General information
2. Operating controls and connections

The LED status indicator shows the operating status.

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 up 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.

• Upstream overcurrent protection as specified in chapter Fronius Backup Controller3P-35A on page (→).
• A surge protection device (SPD) as specified in chapter Fronius Backup Controller3P-35A on page (→).

1. Installation and Startup

• Upstream overcurrent protection as specified in chapter Fronius Backup Controller3P-35A on page (→).
• A surge protection device (SPD) as specified in chapter Fronius Backup Controller3P-35A on page (→).

1. Installation and Startup
2. Prerequisites for connecting

• Upstream overcurrent protection as specified in chapter Fronius Backup Controller3P-35A on page (→).
• A surge protection device (SPD) as specified in chapter Fronius Backup Controller3P-35A on page (→).

1. Installation and Startup
2. Prerequisites for connecting

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

1. Installation and Startup
2. Prerequisites for connecting

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 and Startup
2. Prerequisites for connecting

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 conductors possible

1. Installation and Startup

1. Installation and Startup
2. Installation

1. Installation and Startup
2. Installation

1

Switch off the house connection fuse and 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 and Startup
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 and Startup
2. Installation

1

Strip the insulation of the single conductors by 12 mm.
Select the cable cross-section in accordance with the instructions in Permitted 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 and Startup
2. Installation

1

Strip the insulation of the single conductors by 12 mm.
Select the cable cross-section in accordance with the instructions in Permitted 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 and Startup
2. Installation

1

Strip the insulation of the single conductors by 12 mm.
Select the cable cross-section in accordance with the instructions in Permitted 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 and Startup
2. Installation

1

Strip the insulation of the single conductors by 10 mm.
Select the cable cross-section in accordance with the instructions in Permitted 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 and Startup
2. Installation

• Use network cables of type CAT5 STP or higher.
• Use a twisted cable pair for corresponding data cables.
• Use double insulated or sheathed data cables when near bare conductors.
• Use shielded twisted pair cables to avoid interference.

1. Installation and Startup
2. Installation

• Use network cables of type CAT5 STP or higher.
• Use a twisted cable pair for corresponding data cables.
• Use double insulated or sheathed data cables when near bare conductors.
• Use shielded twisted pair cables to avoid interference.

1. Installation and Startup

1

Switch on the battery connected to the inverter.

2

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

1. Installation and Startup
2. Commissioning

1

Switch on the battery connected to the inverter.

2

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

1. Installation and Startup
2. Commissioning

IMPORTANT!
Settings in the Device configuration > Functions and I/Os menu item may only be implemented by staff trained to do so! The service password must be entered for the Device configuration menu item.

1. Installation and Startup
2. Commissioning

1. Installation and Startup
2. Commissioning

• 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).

1. Installation and Startup

1. Installation and Startup
2. Commissioning (Fronius Symo Hybrid)

1. Installation and Startup
2. Commissioning (Fronius Symo Hybrid)

	1Press the "Menu" key on the inverter
	The menu level is displayed. 2Press the unassigned "Menu / Esc" key 5 times
	Access Code is displayed in the CODE menu; the first digit starts flashing. The access code for the CONFIG menu is: 39872
	3Select the value for the first digit of the code with the keys
	4Press the "Enter" key
	The second digit flashes.
	5Repeat steps 3 and 4 until the entire access code (39872) flashes.
	6Press the "Enter" key
	The first parameter of the CONFIG menu is displayed.

1. Installation and Startup
2. Commissioning (Fronius Symo Hybrid)

• EmergencyPower 50Hz: for all countries with a nominal frequency of 50 Hz
• EmergencyPower 60Hz: for all countries with a nominal frequency of 60 Hz

		1Use the 'Up' and 'Down' keys to select the Alternative (emergency power) setup
		2Press the ‘Enter’ key.

1. Installation and Startup
2. Commissioning (Fronius Symo Hybrid)

• 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
2. Care, maintenance, and disposal

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
2. Care, maintenance, and disposal

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

1. Appendix
2. Care, maintenance, and disposal

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. Used equipment must be returned to the distributor or through a local authorized collection and disposal system. Proper disposal of the used device promotes sustainable recycling of resources and prevents negative effects on health and the environment.

• Collect separately
• Observe local regulations
• Crush cardboard boxes

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
2. Warranty provisions

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. Appendix
2. Technical data

1. Circuit diagram

1. Circuit diagram

1. Circuit diagram

1. Dimensions