ABB REM 610 - Page 132

Example:
Start-up current of the motor 6.2 x FLA
Start-up time of the motor 11 s
One hot start allowed
Ambient temperature 40°C
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.
t/s
I/FLA
50
10
20
5
1
2
3
4
30
40
2345 1068
1.05
t
6x
120
60
30
20
15
10
5
2.5
[s]
1
A070815
Fig. 6.1.2.2.-3 Selected safe stall time 60 s
132
REM 610REM 610
Motor Protection Relay
Technical Reference Manual - ANSI Version
1MRS755537