11.Temperature Protection (Optional) - ABB REM 610 Technical Reference Manual

1MRS 752263-MUM
4.1.4.11.
Motor protection Relay
Technical Reference Manual
The CBFP will not be triggered in case of:
• an alarm or a trip of the thermal protection stage
• an alarm or a trip a temperature stage
• a trip of the phase reveral stage
• an external trip
The CBFP can also be selected to be triggered by applying a digital input signal to
the relay. In this case, the CBFP will generate a trip signal via output PO2 if the
current has not been cut off on expiration of the set operate time. External triggering
will be inhibited when all phase currents fall below 12 per cent of the FLC of the
motor, i.e. at standstill.
Internal triggering is selected by activating the CBFP in SGF and external triggering
by activating the CBFP in SGB. Both triggering options can be selected at the same
time.
Normally, the CBFP controls the upstream circuit breaker. However, it can also be
used for tripping via redundant trip circuits of the same circuit breaker, provided that
the circuit breaker has two trip coils.
Temperature protection (optional)
The temperature protection detects too high temperatures in motor bearings and
windings, for instance, measured either using RTD sensors or thermistors.
The optional RTD module includes six inputs divided into two groups: RTD1...3
form ThA and RTD4...6 ThB. Inputs RTD1 and RTD4 can also be used with
thermistors.
The inputs of ThA can be used for measuring the stator temperature and those of
ThB for measuring bearing temperatures and the ambient temperature, for instance.
Each RTD input can be set out of operation. This state will be indicated by dashes
on the LCD and by "-999" when parameters are read via the SPA bus. When RTD
sensors/thermistors are not in use, dashes will be shown on the LCD and "-999"/
"999" when parameters are read via serial communication.
Note!
All RTD inputs will automatically be set out of operation when the self-supervision
of the RTD module has detected a fault.
Temperature protection using RTD sensors
An alarm value, Ta1...6>, and a trip value, Tp1...6>, are set for each input separately.
When one or several measured temperatures exceed their set alarm values, Ta1...3>/
Ta4...6>, stage ThA/ThB will generate an alarm signal on expiration of the set
operate time. When one or several measured temperatures exceed their set trip
values, Tp1...3>/Tp4...6>, stage ThA>/ThB> will generate a trip signal on
expiration of the set operate time.
The alarm signal from ThA>/ThB> will be reset in 800 ms after the temperatures
have fallen below their respective set alarm values (Ta1...3>/Ta4...6>) and the trip
signal in 800 ms after the temperatures have fallen below their respective set trip
values (Tp1...3>/Tp4...6>).
REM 610
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