Pole Changing Starter" Control Function - Siemens SIMOCODE pro System Manual

Motor control
4.2.11

"Pole changing starter" control function

Description
With this function, SIMOCODE pro can control motors with two stator
windings at two speeds (FAST and SLOW).
Control commands
• SLOW: Start with "ON >" activates the QE2 contactor control (SLOW).
• FAST: Start with "ON >>" activates the QE1 contactor control (FAST).
• Stop with "OFF" deactivates the contactor controls.
The control commands can be issued to SIMOCODE pro from arbitrary
control stations (see also the description of "control stations"). Thus, the
inputs (plugs) must be connected to the corresponding sockets, preferably
to the "Enabled control command" sockets.
It does not matter in what order the control commands are given.
Every fault message causes the contactor control to be deactivated.
Switching the speed
The speed can be switched once the "Feedback ON" signal has expired
(motor is switched off) AND when changing from "FAST" => "SLOW" after
the change-over pause has elapsed:
• Via the OFF control command.
• Directly when "Saving change-over command" is activated.
Change-over pause
The "Change-over pause" parameter can be used to delay switching from
"FAST" to "SLOW" to give the motor enough time to run down.
Notice
Two set currents must be set for this control function:
• I 1 for the slow speed
s
• I 2 for the fast speed.
s
Depending on the current range, the current can in many cases be directly
measured at both speeds with a single current converter. Otherwise you
will need two external current converters according to the corresponding
speed (e.g. 3UF18 with a 1 A secondary transformer rated current), whose
secondary cables must lead through the current measuring module with the
range 0.3 - 3 A. The set current I
the secondary currents of the external transformers. For further information,
see Chapter 3.2 "Overload
4-44
1 or I 2 must be converted according to
s s
protection".
SIMOCODE pro
GWA 4NEB 631 6050-22 DS 03