The retrofittable circuit board is used to integrate fault indicators of the FLA3.1 product line into a remote indication system. It provides bidirectional connectivity to all functions of the indicators. The board can be equipped with whether a TTL interface, an RS232 or an RS485 interface for the connection to a remote terminal unit (RTU). Further equipment options are a relay output for notifications, a d-sub DE9 socket and an U.FL connector for external antennas.
Via the Modbus protocol or a customer-specific ASCII-based protocol all functions of the fault indicators of the FLA3.1 product line can be used remotely.

Functions provided for the FLA3.1 product line

- Remote setting of all functions, such as trip current, response delay, reset time, automatic recloser settings etc.
- Remote test and reset
- Remote read-out of line current
- Remote indication of faults. Distinct remote indications for permanent and temporary fault or transient currents.

Special functions for the fault indicators type FLA3.1V and FLA3.1VL:

- Remote indication of voltage or current status
- Datalogging of current read-outs and voltage status
- Remote indication via short transmissions for optimized power consumption

FEATURES AND BENEFITS

Bidirectional short range radio connection to fault indicators of the FLA3.1 product line

Retrofittable into existing remote terminal units (RTU)

Serial interfaces:
– TTL
– Or: RS232 
– Or: RS485

Protocol:
– Modbus (RTU mode, slave device)
– Or customer-specified (ASCII-based)

Antenna:
– internal
– optional: U.FL connector for external antenna

Power supply:
– external 3.3V DC - 3.6V DC for TTL interface / RS485 interface
– Or external 5V DC / 8-24V DC for RS232 / RS485 interface