AggieRalph
Member
with 1769 OF4. Setting output to 20ma
If measured with meter at output no device connected get
PLC -- Meter
20ma output
If measured with meter at end device
PLC - Wires - Meter
20ma
If I then connect VFD to the output
PLC -- wires -- VFD
Signal = 16ma
(meter in series measurement and as read by VFD with meter)
If I connect a meter and source using meter 20ma from where PLC is
Meter -- same wires -- VFD
20ma at VFD as read by VFD
anyone seen something like this. Only thing I can think of is faulty output card but can't think of why it would be faulting like this. Any other ideas?
If measured with meter at output no device connected get
PLC -- Meter
20ma output
If measured with meter at end device
PLC - Wires - Meter
20ma
If I then connect VFD to the output
PLC -- wires -- VFD
Signal = 16ma
(meter in series measurement and as read by VFD with meter)
If I connect a meter and source using meter 20ma from where PLC is
Meter -- same wires -- VFD
20ma at VFD as read by VFD
anyone seen something like this. Only thing I can think of is faulty output card but can't think of why it would be faulting like this. Any other ideas?