Xylem SSW-07 Soft-Starter - Manual (Page 42)

CHAPTER 5 - PROGRAMMING INFORMATION AND SUGGESTIONS
41
English
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
acceleration 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;
Enable
0
100%Un Start
Pump Control
P102
P101
U(V)
Figure 5.6 - Manometer showing pressure increase
7) Program the deceleration initial voltage (P103) only when no
pressure drop is detected at the deceleration begin. With this
deceleration initial voltage you can improve the linear pressure
drop during the deceleration;
8) Set the deceleration time according to the application, and,
ensuring that the pump stops smoothly within the expected
limits. The set of excessively long times may result in vibrations
or harmful motor overheating;
Pára
0
100%Un Parada
P104
P105
t(s)
P103
U(V)
Figure 5.7 - Manometer showing the pressure drop
9) Generally, the current increases at the end of the deceleration ramp
and in this case the motor requires more torque to achieve a smooth
water flow stop. When the motor has already stopped, but is still
enabled, the current will increase too much. To prevent this condition,
set P105 to a value that as soon it stop it is also disabled;