ABB REM 610 Technical Reference Manual page 118

REM 610
118
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 FLA, permitting a start-up time slightly longer than the one stated by
the motor manufacturer; see the figure below.
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 FLA equals the FLA of the motor.
Thus, the start-up current of the motor is 6.2 x the internal FLA.
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 FLA, permitting a start-up time slightly longer than twice the
one stated by the motor manufacturer; see the figure below.
6.2 x FLA
11 s
40°C
1MRS 755537