Dahlander" Control Function - Siemens SIMOCODE pro System Manual

4.2.9

"Dahlander" control function

Description
With this function, SIMOCODE pro can control motors with only one stator
winding at two speeds (FAST and SLOW). SIMOCODE pro wires the stator
winding via the contactors so that there is a high pole number at low speed
and a low pole number at high speed.
Control commands
• SLOW: Start with "ON >" first activates the QE2 contactor control (SLOW).
• FAST: Start with "ON >>" first activates the QE3 contactor control (star
contactor, FAST) and then immediately activates the QE1 contactor control
(network contactor, FAST)
• Stop with "OFF" deactivates the QE1, QE2 and QE3 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.
Every fault message causes the QE1, QE2 and QE3 contactor controls 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.
SIMOCODE pro prevents the contactors for the "FAST" speed from being
switched on at the same time as the contactor for the "SLOW" speed.
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.
SIMOCODE pro
GWA 4NEB 631 6050-22 DS 03
Motor control
4-37