Current Limit Starting; Starting With Pump Control (P202 = 2) - WEG SSW-07 Manual Del Usuario

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Chapter 5 - prOGraMMING INFOrMatION aND SUGGeStIONS
5.1.2 Current Limit
Starting
5.1.3 Starting with
Pump Control
(P202 = 2)
40
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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, 20 to 25 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).
I(A)
Start
I Limitation
Maximum Time
0
Current Limitation
Enable
Figure 5.4 - Current limit starting
NOTES!
 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.
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;
Figure 5.5 - Direction of rotation of a hydraulic centrifugal pump
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I Nominal
Disable
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t(s)