WEG SSW-06 - 7.1.5 Starting with Pump Control (P202=2)

CHAPTER 7 - PROGRAMMING INFORMATION AND SUGGESTIONS
149
7.1.5 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;
Figure 7.7 - Direction of rotation of a hydraulic centrifugal pump
4) Set the initial voltage - P101 – so the motor starts smoothly as
soon as it is enabled.
5) Set the acceleration time according to the application, and, that
the motor is able to start the load smoothly, but the required ac-
celeration is not exceeded. If acceleration times are set too long,
this may result in vibration or harmful motor overheating;
6) To check the correct starting process, always use a manometer
in the hydraulic installation. Pressure increase should not result
in sudden oscillations. Thus the pressure increase should be as
linear as possible;
7) Program the voltage step during the deceleration only when no
pressure drop is detected at the deceleration begin. With this de-
celeration voltage step you can improve the linear pressure drop
during the deceleration;
8) Set the deceleration time according to the application, and, ensu-
ring that the pump stops smoothly within the expected limits. The
set of excessively long times may result in vibrations or harmful
motor overheating;
Figure 7.8 - Manometer showing pressure increase
Enable
P102
Pump Control
0
P101
U(V)
Start
100%Un
P611
P610
P401
P400
Pump
Control
P105
P104
P103
P102
P101
P130
P640
P406
P620