Functions
8.9 2-/3-wire control
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-47
8.9.4 3-wire control (P0727 = 3)
Description
There are three signals associated with this function:
OFF1/HOLD: Being maintained closed the opening of the contact will switch the
inverter OFF and cause a ramp down to 0 Hz.
ON_PULSE: This will run the motor in a forward direction (run right).
REV: This will change the direction of the motor to reverse (run left).
Function
The switch OFF1/HOLD uses negative logic: the contact will need to be maintained closed in
order to switch the inverter ON or keep it running.
A momentary closure (positive edge) of the ON_PULSE switch latches and starts the inverter
if it was OFF before.
The direction can be determined and changed any time using the REV signal.
Opening or closing the ON_PULSE switch while the drive runs has no effect.
Only enabling (i.e. Opening) OFF1/HOLD will unlatch the run-state and then stop the
inverter.
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Figure 8-32 3-wire control using ON_PULSE, OFF1/HOLD and REV
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