Control Logix/Powerflex analog input problems
Control Logix/Powerflex analog input problems
(OP)
I have a control logix plc and two powerflex drives with speed and current feedback to the PLC (4-20ma). 24V is supplied from a common powersupply.
When I have any combination of 3 or more of the analog input signals connected all signals go crazy. Signals work fine if less than 2 are connected.
Any ideas?
When I have any combination of 3 or more of the analog input signals connected all signals go crazy. Signals work fine if less than 2 are connected.
Any ideas?





RE: Control Logix/Powerflex analog input problems
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One day my ship will come in.
But with my luck, I'll be at the airport!
RE: Control Logix/Powerflex analog input problems
What about the size of 24v power supply?
RE: Control Logix/Powerflex analog input problems
Sounds like you may have a grounding issue between the two drives. One way to fix this is to use loop powered signal isolators.