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External triggering is disabled when all phase currents fall below 12 percent of the
FLA of the motor, that is, 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.
5.1.4.11.
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 49/38-1 and RTD4...6 49/38-2. Inputs RTD1 and RTD4 can also be used with
thermistors.
The inputs of 49/38-1 can be used for measuring the stator temperature and those of
49/38-2 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.
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, and a trip value, RTD1T...RTD6T, are set for each
input separately. When one or several measured temperatures exceed their set alarm
values, RTD1...3A/RTD4...6A, element 49/38-1/49/38-2, element 49/38-1/49/38-2
will generate a trip signal on expiration of the set operate time.
The alarm signal from 49/38-1/49/38-2 will be reset in 800 ms after the
temperatures have fallen below their respective set alarm values (RTD1...3A/
RTD4...6A) and the trip signal in 800 ms after the temperatures have fallen below
their respective set trip values (RTD1...3T/RTD4...6T).
Motor Protection Relay
Technical Reference Manual - ANSI Version
REM 610
REM 610
1MRS755537
Содержание REM 610
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