MDE-4318D Competitive Pump and CRIND (CPC) Hardware/Software Start-up and Service Manual · May 2010 Page 49
Communication Issues - Checklist
Troubleshooting Steps
What are the outgoing voltages of the CPC D-Box Transformer?
Red Wire (Pin 1) to Red Wire (Pin 2)
Must be between 12 – 13 VAC
Green and Yellow Wire (Pin 3) to Chassis
Ground
Must be 0 VAC as this is a reference from ground to
ground
Blue Wire (Pin 4) to Blue Wire (Pin 6)
Must be between 14 – 15 VAC
If outgoing voltages are not present (and incoming voltage is present on the primary), then:
• Inspect the Q12682-01 fuse in the power block as it may have to be replaced.
• The transformer itself may have to be replaced.
Are any pump loop data wires daisy-chained?
Note: Verify this by removing a pair of wires from the distribution box for a fueling position. If
multiple positions lose communication, data wires are daisy-chained at some point at
that location.
Field wiring cannot be daisy-chained at any point of the installation (at the distribution box,
inside the wiring trough, and so on). Daisy-chaining will compromise communication from
the POS to the forecourt. Wiring found to be daisy chained will require reinstallation as per
Gilbarco installation requirements.
Is the T19547 Distribution Board jumpered for 34 mA?
The T19547 two-wire distribution box Board must be jumpered for 34 mA communication
(JP10 installed) when interfaced with Wayne dispensers. If this jumper is not positioned
properly, the variance in amperage will affect communication.
Figure 4-2: T19547 Distribution Board Jumpered for 34 mA
What voltage is present on TP1 of the T19547 Distribution Board?
This must be approximately 13 VDC (unregulated). If this voltage is not present (or out of
specifications), then the T19547 Distribution Board (or transformer) will have to be replaced.
