7
VPIFb
FEB 2008
TROUBLESHOOTING GUIDE FOR VPIF
Problem/Complaint
Check /Solution
Valve stuck
– Wire size/gauge to small
– Supply power not adequate
– Cable connectors wired incorrectly
– Check signal polarity - #3 and #4, #5 and #6 wires
– Excessive dir t in valve; Use MOV T tool to check for rough
movement
No Valve Position Feedback or Display 25%
– Check 24 VDC power supply
– Check signal polarity - #3 and #4, #5 and #6 wires
– Cable connectors wired incorrectly
– VPIF in the Local and Remote Feedback Mode
No visual data on LED Display
– Check 24 VAC supply power is good (+/-5%)
– Cable connectors wired incorrectly
Valve % open span is ver y limited
– Recalibrate SMV
VPIF indicates % open greater than 100.0%
– Recalibrate SMV
– +/- 3% is within tolerance
VPIF indicates % open less than 0.0%
– Recalibrate SMV
– +/- 3% is within tolerance
VPIF LED Display value is greater than or less
than what is indicated by the system controller
or PLC
– If reading between the two devices are /- 3%, this
is normal
System computer or PLC displays open for SMV
valve position feedback
– VPIF configured in wrong feedback mode
– Cable connectors wired incorrectly
– Check signal polarity - #3 and #4, #5 and #6 wires
VPIF % open 10
ths
position is not stable
– +/- 3% is within tolerance
VPIF % open is not stable
– Check wiring is sufficient size for the distance from 24 VAC
power supply and number of valves connected to the 24 VAC
power supply
– Check 24 VAC power source
– System controller or PLC operation is erratic
– RFI/EMI inter ference
