CHAPTER 7 - APPLICATIONS AND PROGRAMMING
124
7.1.2
Starting by Current Limit
(P202=1)
1) To start the motor with a current limit you must apply a load to the
motor. No-load tests can be done by voltage ramp;
2) Set P102 to the time required for the load start. At first set short
times, 20 to 25s. This time will be used as the locked rotor time,
when the motor is unable to start;
3) Set P110 with Current Limit by considering its electrical installation
and ensuring sufficient torque for the motor start. Initially you can
set firstly 2x to 3x the rated motor current (In of the motor).
Figure 7.4
– Starting by constant current limit
NOTES!
1) If the current limit is not reached during the starting, the motor will
start immediately.
2) P401 must be set according to the motor current;
3) Current Limits that are too low result in torques that are too low for
the motor start. Always maintain the motor running after it has been
enabled;
4) For loads requiring a higher initial starting torque, you can use the
kick start function, P520, or the current ramp method;
5) If errors are detected during the motor start, check all connections
of the Soft-Starter to the power line, the motor connections, the
voltage levels of the power line, the fuses, circuit-breakers and
disconnecting switches.
I(A)
Start
I Nominal
P110
P102
0
Enable
Limit Current
Disable
t(s)
I Limit
Maximum Time
P110
P102
Current
Limit
P640
P406
P401
P400
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