Current Limit Starting; Starting With Pump Control (P202 = 2) - WEG SSW-08 Manual Del Usuario

Programming Information and Suggestions

5.1.2 Current Limit Starting

1) To start with a current limitation it is necessary to start with a load. Initial test without load can
be done with a voltage ramp;
2) Set the acceleration time with the necessary starting time, initially with short times, 15 to 20
seconds. This time will be used as the stall time in case the motor does not start;
3) Set the current limit according to the conditions that your electric installation allows, as well
as to the values that supply enough torque to start the motor. It can initially be programmed
with values between 2x and 3x the nominal current of the motor (ln of the motor).
5
NOTE!
If the current limit is not reached during the start, the motor will start immediately;
„
Very low Current Limit values do not provide sufficient torque to start the motor.
„
Always keep the motor rotating once it is started.
For loads that need a higher initial starting torque, the Kick Start function can be used;
„
If faults occur during the start, check all the connections from the Soft-Starter to
„
the supply network, motor connections, supply network voltage levels, fuses and
circuit breakers.

5.1.3 Starting with Pump Control (P202 = 2)

1) To start with pump control a load is necessary. No-load tests can be done with voltage ramp;
2) The starting parameters setting depend mainly on the types of hydraulic installations. Thus
we recommend optimizing factory settings, if possible.
3) Check if the motor rotation direction is an indicated on the pump frame. If not, connect the
phase sequence as indicated at P620;
36 | SSW-08
I(A)
Start
I Limitation
Maximum Time
0
Current Limitation
Enable
Figure 5.4: Current limit starting
Figure 5.5: Direction of rotation of a hydraulic centrifugal pump
I Nominal
t(s)
Disable