ABB REM 610 Technical Reference Manual page 117

1MRS 752263-MUM
Motor protection Relay
Technical Reference Manual
In this case, a safe stall time setting of 23 seconds is selected from the trip curves at
prior load 1 x FLC, permitting a start-up time slightly longer than the one stated by
the motor manufacturer; see the figure below.
t/s
50
40
30
20
10
5
4
3
2
1.05
1
1 2 3
Fig. 5.1.2.2.-2 Selected safe stall time=23 s
Example 3
Start-up current of the motor
Start-up time of the motor
Two hot starts allowed
Ambient temperature
At an ambient temperature of 40°C the internal FLC equals the FLC of the motor.
Thus, the start-up current of the motor is 6.2 x the internal FLC.
In Fig. 5.1.2.2.-3, a safe stall time setting of 60 seconds is selected from the trip
curves at prior load 1 x FLC, permitting a start-up time slightly longer than twice the
one stated by the motor manufacturer; see the figure below.
t
6x
[s]
120
60
30
20
15
10
5
2.5
4 5 6 8 10
I/I
n
6.2 x FLC
11 s
40°C
REM 610
117