Emergency Start Esmgapc; Motor Startup Supervision Sttpmsu; Motor Stall Protection Jamptoc - ABB RELION 630 Series Applications Manual

Section 3
REM630 variants
3.2.6.2
3.2.6.3
3.2.6.4
32
The thermal overload alarm and trip provide an LED indication on the LHMI. The
thermal overload alarm, thermal overload trip and restart inhibit signals are connected
to the disturbance recorders.

Emergency start ESMGAPC

Emergency start function is used in an emergency where motor needs to be started
even with a knowledge that it may result into damage to the motor. The function only
forces the IED to allow restarting of the motor but it does not actually restart it.
The set of three phase currents, I3P, is connected to the inputs. Emergency start is
allowed when binary input COM BI11 is activated.
The emergency output is connected to the disturbance recorder and is used to provide
a LED indication on the LHMI.

Motor startup supervision STTPMSU

The motor startup supervision function protects against excessive starting time and
locked rotor conditions of motors during startup.
Further, on exceeding the specified number of startups within certain duration, the
function prevents restarting. After any motor start, further restarts are also inhibited
until settable duration of time.
The starting of the motor is supervised by monitoring the true RMS magnitude of all
phase currents. During the startup of the motor, the function calculates the integral of
2
I t value and if the calculated value exceeds the set value, the operate signal is
activated. A speed switch information, which indicates whether the rotor starts to
rotate or not, can also be used in this function.
The output signals indicating I
motor restart inhibit are connected to the disturbance recorders and used to provide a
LED indication on the LHMI. The motor startup information is also available at binary
output PSM SO3.

Motor stall protection JAMPTOC

The motor load jam protection function is used for protection against mechanical jam
when motor is running. The function is blocked during motor startup.
The set of three phase currents, I3P, is connected to the inputs. The function operates
when the measured current is above the setting. The operation characteristic is definite
time.
The operate signal is used to trigger the disturbance recorder and to provide a LED
indication on the LHMI.
2
t operate, motor startup, motor stall condition and
1MRS756785 G
REM630
Application Manual