Trip-Circuit Supervision - ABB REM 610 Technical Reference Manual

REM 610
4.1.5.
54
Motor Protection Relay
Technical Reference Manual
Table 4.1.4.13-10 Elements 49/38-1 and 49/38-2
Feature
Operate time accuracy at
definite-time characteristic
RTD sensors
Set alarm value, RTD1...6A
Operate time, RTD1...6A TDLY
Set trip value, RTD1...6T
Operate time, RTD1...6T TDLY
Hysteresis
Operation accuracy
Thermistors
Set trip value, PTC1 and PTC2
Operate time
Operation accuracy
Table 4.1.4.13-11CBFAIL
Feature
Set Operate time
Phase-current threshold for external
triggering of the CBFAIL
• pick-up/drop-off
1)
The setting step is 0.5.
2) 2
Elements (48/14 PICKUP) x (48/14 TDLY) and 48/14 cannot be used concurrently.
3)
The element can be set out of operation in SGF. This stat will be indicated by dashes on the LCD and
by "999" when parameters are read via the SPA bus.
4)
The element can be set out of operation in SGF
Note!
The accuracies apply only when the FLA secondary scaling factor has been set to 1.

Trip-circuit supervision

The trip-circuit supervision (TCS) detects open circuits, both when the circuit
breaker is open and closed, and trip-circuit supply failure.
The trip-circuit supervision includes:
• a current limiter including the necessary hardware
• a software-based function in the self-supervision system
The trip-circuit supervision is based on the constant current injection principle: by
applying an external voltage over the relay's trip contacts, a constant current is
forced to flow through the external trip circuit. If the resistance of the trip circuit
exceeds a certain limit for more than 21 seconds, due to oxidation or a bad contact,
for instance, the trip-circuit supervision will be activated and a warning will appear
on the LCD together with a fault code. The warning signal from the trip-circuit
supervision can also be routed to SO2 by setting switch SGF1/8 to 1.
Value
±3% of the set
operate time or
200 ms
0...200°C
1...100 s
0...200°C
1...100 s
5°C
±1°C
(±3°C for Cu10)
0.1...15.0 kΩ
2 s
±1% of the setting
range
Value
0.10...60.0 s
0.13/0.11 x FLA
1MRS 755537