Display Module; Power Supply Module - ABB REL300 Instruction Manual

I.L. 40-385.7

1.3.6 Display Module

The Display module has two (four-digit) alphanumeric displays for settings, metering fault des-
ignation and information. The metering display shows three-phase voltage, current and angle.
Fault data, stored in the Microprocessor module, is accessible through the front panel display.
Fault data includes: pre-fault phase A voltage, current and angle. It also shows the type of fault,
fault voltages, currents, angles and fault location. The Display module is attached to the front
panel (see Figure 1-1); it can be used to access and store data, and contains 7 LEDs, as fol-
lows:
• Relay in Service (ready to use)
• Settings (can read or change settings)
• Volts/Amps/Angles (can read measuring inputs)
• Last Fault (when flashing, indicates new fault information available)
• Previous Fault (when last fault LED flashes twice/minute, indicates information for the fault
preceding the last fault)
• Value Accepted (when the Settings LED is also "ON", a new setting value is accepted; when
the Test LED is also "ON", the output contacts can be tested)
• Test (can verify self-check and perform functional test)
The display will be blocked momentarily, every minute, for the purpose of self-check; this will
not affect the relay protection function.
A display saver software is also built in. The REL300 display will be on only for 5 minutes after
turning the dc power on or depressing any one of the front panel push-button or detecting faults
on the line.

1.3.7 Power Supply Module

The Power Supply module (see Appendix G) is available in three ranges:
• 38 - 70 Vdc
• 88 - 145 Vdc
• 176 - 290 Vdc
Provides isolation from station battery; includes overcurrent and overvoltage protection. Status
monitoring and loss-of-power indication are accomplished via a failure-alarm relay (on the In-
terconnect module). Relay is normally picked up, but the processor deenergizes it when a prob-
lem is found. Total power loss also drops-out the relay. Front-panel test points provide access
to power-supply output voltages for test purposes:
• +12 Vdc
• -12Vdc
• -24 Vdc
• + 5 Vdc
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