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Manual – MOVI-PLC® Application Solution "SyncCrane"
3
Hardware limit switches
Project Planning
3.7 Hardware limit switches
3.7.1 Preliminary work
Hardware limit switch processing is not supported by default. If you still want to use hard-
ware limit switches, you will have to perform the following steps:
• Example of 2 inverters each of them with own hardware limit switches:
– Connect the CW hardware limit switch of inverter 1 in series with inverter 2.
– Set a hardware input for each inverter to "/Hardware limit switch CW".
– Connect the CW hardware limit switches to the two inputs.
– Wire the CCW hardware limit switch in an analogous manner.
3.7.2 Fault response
In the event of a fault, the drive inverter goes to status F29 "Limit switch approached".
Ongoing movements are interrupted with the "Emergency stop ramp".
3.7.3 Moving clear of the hardware limit switch
Correct the operating mode selection in such a way that travel movement away from the
hardware limit switch position can be triggered.
You can use one of the following ways to do so:
• Move group unsynchronized away from the limit switch:
– Select "jog" mode.
– Specify the jog direction away from the limit switch position.
– Acknowledge the fault.
– The travel movement is started.
– The drives have moved clear of the limit switch once they change from unit status
"9" (limit switch approached) to "A".
– You can interrupt the motion sequence by deselecting the operating mode.
• Move group synchronized away from the limit switch:
– Select "automatic" mode.
– Select the jog mode of the virtual encoder.
– Specify the jog direction away from the limit switch position.
– Acknowledge the fault.
– The travel movement is started.
– The drives have moved clear of the limit switch once they change from unit status
"9" (limit switch approached) to "A".
– You can interrupt the motion sequence by deselecting the operating mode.