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

1MRS 755537
4.1.4.11.
Motor protection Relay
Technical Reference Manual
The CBFAIL will not be triggered in case of:
• an alarm or a trip of the thermal protection element
• an alarm or a trip a temperature element
• a trip of the phase reveral element
• an external trip
The CBFAIL can also be selected to be triggered by applying a digital input signal
to the relay. In this case, the CBFAIL 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 diabled when all phase currents fall below 12 per cent of the FLA
of the motor, i.e. at standstill.
Internal triggering is selected by activating the CBFAIL in SGF and external
triggering by activating the CBFAIL in SGB. Both triggering options can be selected
at the same time.
Normally, the CBFAIL 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 and RTD4...6
49/38-1
thermistors.
The inputs of can be used for measuring the stator temperature and those of
49/38-1
for measuring bearing temperatures and the ambient temperature, for
49/38-2
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,
RTD1A...RTD6
input separately. When one or several measured temperatures exceed their set alarm
values,
RTD1...3A/RTD4...6A
on expiration of the set operate time. When one or several measured temperatures
exceed their set trip values,
generate a trip signal on expiration of the set operate time.
The alarm signal from 49/38-1
temperatures have fallen below their respective set alarm values (
) and the trip signal in 800 ms after the temperatures have fallen below
RTD4...6A
their respective set trip values (
. Inputs RTD1 and RTD4 can also be used with
49/38-2
, and a trip value,
RTD1T...RTD6T
, element
49/38-1/49/38-2
, element 49/38-1
RTD1...3T/RTD4...6T
/
49/38-2 will be reset in 800 ms after the
).
RTD1...3T/RTD4...6T
REM 610
, are set for each
will generate an alarm signal
/
49/38-2 will
RTD1...3A/
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