Inputs; Outputs; Emergency Start; Restart Inhibit - ABB REM 610 Technical Reference Manual

1MRS 752263-MUM
4.1.1.3.
4.1.1.4.
4.1.1.5.
4.1.1.6.
Motor protection Relay
Technical Reference Manual
• 4.1.4.10. Circuit-breaker failure protection
• 4.1.4.11. Temperature protection (optional)

Inputs

REM 610 includes four energizing inputs, two digital inputs and three optional
digital inputs controlled by an external voltage. Three of the energizing inputs are
for the phase currents and one for the earth-fault current. For details, refer to section
Input/output connections and tables 4.1.4.12-7, 4.2.1-1 and 4.2.1-5. The functions
of the digital inputs are determined with the SGB switches.

Outputs

REM 610 is provided with three power outputs (PO1, PO2 and PO3) and two signal
outputs (SO1 and SO2). Switchgroups SGR1...5 are used for routing internal signals
from the protection stages, the motor start-up signal and the external trip signal to
the desired signal or power output. The minimum pulse length can be configured to
be 40 or 80 ms and the power outputs can all be configured to be latched.

Emergency start

The emergency start function allows motor start ups although the restart inhibit has
been activated. The function is activated in SGB1...5. The emergency start will be
activated when the selected digital input is energized and will remain active for ten
minutes. On the rising edge of the emergency start signal
• the calculated thermal level will be set slightly below the restart inhibit level to
allow at least one motor start up
• the value of the register of the cumulative start-up time counter will be set
slightly below the set restart inhibit value to allow at least one motor start up
• the set trip values of temperature stages ThA> and ThB> will be increased by 10
per cent
• the external restart inhibit signal will be ignored.
The set trip values of stages ThA> and ThB> will be increased by ten per cent and
the external restart inhibit signal ignored for as long as the emergency start is
activated. A new emergency start cannot be made until the emergency start signal
has been reset and the emergency start time of ten minutes has expired.
Activation of the emergency start signal will generate an event code, which cannot
be masked out from the event reporting.

Restart inhibit

The restart inhibit signal is used to inhibit motor start ups when the motor is
overheated, for instance. The restart inhibit signal is routed to PO3 by default, but
can be deselected in SGF1. The signal will be activated when any of the following
conditions exists:
• the trip signal from any protection stage is active
• the restart inhibit signal from the thermal protection stage is active
• the restart inhibit signal from stage Σt
• the external restart inhibit signal is active
is active
si
REM 610
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