Progressive International Electronics PCXZ - Manual (Page 51)

Progressive International Electronics PCXZ
Version 4.2/April 2005 Page 43
PCXZinstall
Diagnostics
Troubleshooting Procedures
Gilbarco Dispenser/CRIND
In addition to the general diagnostic procedures that should be employed when troubleshooting a
fuel system, there are some unique considerations when working with Gilbarco dispensers and
readers.
DBox Configuration. Gilbarco uses several electrical interfaces for communications to and from the
dispenser, such as two-wire interface (TWI) and RS422. The distribution box must match the PIE
configurator ordered for the system. Both the Gilbarco Universal DBox and PIE’s DBox can be set up
as either a TWI or RS422 box and can easily be changed in the field. Refer to the appropriate DBox manual
for configuration information.
TWI Current Level. Current level needs to be 45mA on Gilbarco DBoxes using TWI communication.
The signal current is generated by the PIE configurator box. Occasionally this current level needs to
be set to accommodate the Gilbarco DBox input circuitry. See Diagram: PCXZ Connector/Jumper Layout in the
PCXZ Installation section of this manual for details on how to alter this setting in the PIE configurator box.
Polarity Sensitivity. Gilbarco TWI communication is polarity sensitive. If the two loop wires
connecting the PIE configurator box to the DBox are reversed polarity, they must be switched. Some
Gilbarco DBoxes and PIE’s DBox have reverse polarity LEDs to indicate this condition. If this occurs in
a system that uses the PIE universal cable, unplug the cable, reverse ends and reconnect. The cable
is designed to reverse polarity when switched end to end.
Configurator Board LED Indicator for Open Loop Condition. The PIE Gilbarco-style configurator
board has an LED that will assist in determining if the TWI is open. If this LED remains on solid with
prices sent to the PCXZ controller, then there is a possibility of an open loop condition. Check loop
wiring between the PIE configurator and the DBox.
Blender Dispensers and Hose Numbering. Gilbarco blender dispensers use slightly different hose
numbering systems than a standard MPD. A Gilbarco blender can have up to five product selections
on a side, plus an optional single-product hose. The hose numbers returned by the dispenser can be
modified by the dispenser option programming. To determine which hose numbers are returned for
which product or dispenser, using PCC or your POS application, send prices for six hoses. Then test
the dispenser by dispensing a small quantity of each product and note which hose number is returned
at the end of the sale for each product. Below is an example of different ways a 3-product blender
can be set up.
Example:
Gilbarco Blender Hose Assignments
3-Product
Blender
(Example 1)
3-Product
Blender
(Example 2)
product 1 -> hose 1 product 1 -> hose 1
product 2 -> hose 2 product 2 -> hose 3
product 3 -> hose 3 product 3 -> hose 5
Contact your Gilbarco representative for additional information on Gilbarco blenders.