Functions
8.9 2-/3-wire control
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-43
ON/OFF1 and REV
This method allows the inverter to be started and stopped using the ON/OFF1 command and
the direction of the inverter changed using the REV command. These commands can be
assigned to any of the digital inputs through parameters P0701 … P0709 (and P0712,
P0713 for AI used as DI) or BICO connections.
The REV commands can be given at any time, independent of the frequency output of the
inverter.
Function
On receiving an ON/OFF1 command the inverter will run the motor in a forward direction and
ramp-up the motor to the frequency setpoint.
When a REV command is issued, the inverter will ramp-down the frequency through 0 Hz
and run the motor in the reverse direction. When the REV command is removed the inverter
will ramp-up through 0 Hz and run in a forward direction until the frequency setpoint is reach.
When the ON/OFF1 command is removed, the inverter will stop the motor by performing an
OFF1.
The REV command initiated by itself cannot start the motor.
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Figure 8-28 Siemens standard control using ON/OFF1 and REV
ON/OFF1 and ON_REV/OFF1
This method allows the inverter to run the motor in a forward direction (run right) using the
ON/OFF1 command and in the opposite direction (run left) using the ON_REV/OFF1.
However, for a direction reversal the drive will first have to decelerate with OFF1 and when
reaching 0 Hz the reverse signal can be applied.
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