Installation and Commissioning
GARD 8000 SYS RFL Electronics
November 28, 2017 4-57 973.334.3100
4.6.4.7 CURRENT DIFF RELAY CONFIGURATION SETTINGS VERIFICATION
1. At the ‘Home’ page click on “Settings,” and select ‘Chassis Configuration’
2. At ‘Chassis Configuration’ page click on “Current Diff Relay”
3. At ‘Current Diff Protection’ page shown below, confirm all of the Current Diff Relay settings
related to a specific application.
4. Ensure the Current Diff Relay Settings programmed at the Factory match the required settings.
4.6.4.8 CURRENT DIFF RELAY COMMUNICATIONS STATUS VERIFICATION
The GARD 8000 will exhibit a Communications Alarm if the communications channel for the
Current Diff Relay is not established. If the Current Diff Relay testing is going to be performed
only at one end, the communications interface for the Current Diff Relay channel has to be
under a local ‘loopback’.
While the GARD unit is under a local loopback, the functional testing is limited to
INTERNAL FAULT TRIPPING.
A ‘loopback’ can be performed either by a ‘hard loopback’ or ‘software loopback. The type of
hard loopback depends on the Comms Interface used for the Current Diff Relay channel.
If the Comms interface is a Short Haul or Long Haul Fiber Optic module, connect a short patch
cable between the TX to RX connectors (rear of the GARD). If the Comms interface is one of
the Electrical Interface modules (T1/E1, RS-449, X.21, V.35, G.703) a ‘hard loopback’
connector would have to be made. Please refer to the GARD 8000 Instruction Manual, Section
4.5 to obtain the ‘pinouts’ for the Electrical Interface adapters.
A software loopback can be enabled through the GARD test pages: From the ‘Home’ page
click on “Test,” and select the proper Comms Interface module used for the Current Diff
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