ABB Relion REM615 Product Manual page 11

ABB
Motor Protection and Control
REM615
Product version: 3.0
Figure 4. Motor protection and control of contactor and circuit-breaker controlled motors
using REM615s with the standard configurations A and B. To prevent possible power
system instability due to busbar voltage collapse, the simultaneous starting of several
motors is inhibited. The motor start-up signal from each REM615 is connected to the
"Restartinhibit" inputs of the other REM615s. Hence while one motor is starting-up,
the starting of the other motors is inhibited. The same motor start-up signal is also
used to dynamically increase the setting level of the lowest O/C protection stage of the
REF615 on the incoming feeder. The optional RTD/mA inputs are utilized for motor
winding and bearing temperature supervision.
GUID-52860380-D410-4969-A44E-7C7311221D0F V2 EN
1MRS756890 D
Issued: 2010-06-29
11