PROJOY PEFS Firefighter Safety Switch

General Notice

• Changes or modifications not explained/approved in this manual void your authority to operate this equipment.
• PROJOY shall not be held responsible for any damage caused due to incorrect installation of the product and/or misunderstanding of this manual.
• PROJOY reserves the right to make any modification to this manual or the information contained herein at any time without notice.
• No design data such as sample pictures provided in this manual may be modified or duplicated except for personal use.
• To ensure the recycling of all possible materials and proper disposal treatment of components, please return the product to PROJOY at end-of-life.
• Check the system regularly (once per 3 months) for faults.

Important Safety Precautions

Components in the installations are exposed to high voltages and currents. Follow these instructions carefully to reduce the risk of fire or electric shock.

The following regulations and standards are considered applicable and mandatory to read prior to the installation of electrical equipment:

• International Standards: IEC 60364-7-712 Electrical installations of buildings - Requirements for special installations or locations - Solar Photovoltaic (PV) power supply systems.
• Local building regulations.
• Guidelines for lightning and overvoltage protection.

Note: It is essential to uphold the limits for voltage and current in all possible operating conditions. Also keep in mind the literature on correct dimensioning and sizing of cabling and components.

The installation of these devices may only be performed by certified technical personnel.

The wiring schematics of the Firefighter Safety Switch can be found at the end of this manual.

All installation works should be tested in accordance with relevant local legislation at the time of installation.

Intended Use of the Firefighter Safety Switch

The Firefighter Safety Switch (PEFS) has been especially developed as a safety device for direct current (DC) photovoltaic installations. The DC disconnect switch is used to disconnect the connected strings of the installation in case of an emergency situation, such as in case of fire.

Location of the Firefighter Safety Switch

The PEFS needs to be placed as close to the solar panels as possible. Due to its enclosure, the switch is protected against external influences like dust and moisture. The whole set-up conforms to IP66, making it suitable for outdoor usage when needed.

NOTE: The switch enclosure may not be installed in direct sunlight or be in direct contact with (continuous) ingress water.

Operation Modes

Normal Operation

The PEFS will automatically switch to the off position, breaking the DC connection between the solar panels and the inverter, after the AC power to the PEFS is interrupted for longer than five seconds. The PEFS will automatically switch to the on position, restoring the DC connection between the solar panels and the inverter, once the AC power to the PEFS is restored longer than five seconds.

Special Operation

If the temperature inside the PEFS enclosure exceeds 70 ℃ (70 degrees Celsius), the PEFS will automatically switch to OFF to protect the internal components and create a safe situation. When the installation is checked and the PEFS is not affected, the PEFS can be switched ON again by removal and re-applying the AC voltage to the PEFS. The PEFS will also automatically switch to OFF if there is an internal failure. If this occurs, please try to reset the PEFS by removal and re-applying the AC voltage to the PEFS.

Wiring Options

The PEFS is available in several wiring configurations:

• Kit 1: With knock-outs. Available for 5 x M12 (1 String) or 9 x M12 (2 Strings). This kit features knock-out openings for cable entry.
• Kit 2: With cable glands. Available for 5 x M12 (1 String) or 9 x M12 (2 Strings). This kit includes cable glands for secure cable entry. The outer diameter of the cable should be between 3mm and 7.5mm.
• Kit 3: With pre-wired connectors. Includes 4 x BC03D connectors (1 String) or 8 x BC03D connectors (2 Strings) and 1 x M12 cable gland for AC. This kit comes with pre-attached connectors for faster wiring.

Installation Procedure

Step 1: Installation Requirements

Open the box, take out the PEFS unit, read this manual thoroughly, and prepare a cross/straight screwdriver. Ensure you have the correct M4 screws.

Visual Description: The image shows the product packaging, the PEFS unit, two types of screwdrivers (Phillips and flathead), a warning symbol ⚠️, and an open book symbol ?.

Step 2: Remove the Lid

Remove the four M4 screws using a cross screwdriver to open the lid of the enclosure.

Visual Description: The image shows the PEFS unit with its lid being detached, held by a screwdriver.

Step 3: Mount the Switch Enclosure

Mount the switch enclosure securely on the wall. Note: The screw used for mounting is an M8 self-tapping screw.

Visual Description: The image depicts the PEFS enclosure being attached to a wall using an M8 screw, with a screwdriver shown.

Step 4: Wire the Power AC Connection

Connect the power AC to the terminals. The terminals are labeled CN4, FB1, FB2, P, E, N, L. The AC current rating is 30mA, and the operating voltage is 100Vac - 270Vac. The AC cable should not exceed 0.75 mm².

Note: FB1 and FB2 are used to remotely display the ON and OFF states of the switch. When the switch is closed, FB1 is connected to FB2; when the switch is open, FB1 is disconnected from FB2. An M12 cable gland is required if the remote display function is needed.

Visual Description: A diagram shows the internal wiring terminals for AC connection (FB1, FB2, P, E, N, L). Another diagram illustrates a circuit with the PEFS unit, a MCU-CONTROL, a resistor, an indicator light ?, an external power source, and an AC distribution box. Notes specify external power requirements (+5~48V, >150mA) and resistance (metal shell, >10W). The resistor is selected based on supply voltage to ensure circuit current is less than the rated current of the indicator light and 320mA.

Step 5: Wire the String Cables (DC)

Connect the DC string cables to the interface. Please follow the marks for PV wiring: PV IN terminals are labeled 1+, 1-, 2+, 2- and PV OUT terminals are labeled 1+, 1-, 2+, 2-.

Visual Description: The image shows the front of the PEFS unit with PV IN and PV OUT terminals clearly marked. DC cables are shown being connected to these terminals. The maximum torque for these connections is 1.7Nm.

Step 6: Close the Switch Enclosure

Close the switch enclosure using a cross screwdriver. Secure it with the four M4 screws, ensuring a maximum torque of 1.7Nm.

Visual Description: The image shows the PEFS unit with the lid being closed and secured by screws, with a screwdriver.

Testing Procedure

Follow these steps to test the PEFS functionality:

• Step 1: Activate the AC power circuit. The PEFS should switch ON. (Approx. 35 seconds) ▶️
• Step 2: Wait one minute. The UPS is charging. (Approx. 1 minute) ⏳
• Step 3: Deactivate the AC power circuit. The PEFS will switch OFF in about 7 seconds. The Red LED will turn OFF. ❌
• Step 4: Activate the AC power circuit again. The PEFS will switch ON in approximately 8 seconds. The Red LED will turn ON. ✔️
• Step 5: The test is completed.