ABB REM 610 Technical Reference Manual page 129

1MRS755537
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.
The safe stall time setting is calculated or selected from the trip curves at prior
load 1 x FLA. In the figure below, a safe stall time of 30 seconds is selected,
permitting a start-up time slightly longer than the one stated by the motor
manufacturer; see the figure below.
6.2 x FLA
11 s
40°C
REM 610 REM 610
129