ABB REM 610 Technical Reference Manual page 132

REM 610 REM 610
132
Motor Protection Relay
Technical Reference Manual - ANSI Version
Example:
Start-up current of the motor
Start-up time of the motor
One hot start 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.
t/s
50
40
30
20
10
5
4
3
2
1.05
1
2
1
Fig. 6.1.2.2.-3 Selected safe stall time 60 s
6.2 x FLA
11 s
40°C
2.5
3 4 5 6 8
1MRS755537
t
6x
[s]
120
60
30
20
15
10
5
I/FLA
10
A070815