Gasboy TopKAT Operation Manual - Manual (Page 28)

System Overview Mechanical Interface Option
Page 20 MDE-4338A TopKAT™ Fuel Management System Operation Manual · February 2009
Mechanical Interface Option
The mechanical interface option (Mechanical I/F) allows the TopKAT to control and monitor
up to two mechanical pumps. TopKATs equipped with the mechanical interface can also be
used as part of a master/satellite configuration. Use of this interface results in additional
hardware (Pump Control PCB and solid-state relays) and additional software parameters.
Hardware
The Pump Control PCB is mounted on the inside rear of the chassis; solid state relays which
control power to the pump are located within the chassis. The Pump Control PCB controls all
mechanical pumps by driving the relays which control the pump power, monitors status of the
pump handle to turn relays off, monitors incoming pulses to count quantity, and contains
status LEDs and manual override switches for each hose outlet. Wiring connections and
switch settings for the Pump Control PCB are discussed in more detail in the Installation
Manual.
Software
When a mechanical interface-equipped TopKAT is used as part of a master/satellite
configuration, the TopKAT is configured using PCU assignments (refer to
“About the PCU
File” on page 52 ). When used in standalone mode (one TopKAT controlling two mechanical
hoses), two parameters in the Pump File are used with the mechanical interface option: pump
switch timer and pulse rate. The parameters are loaded via the keypad under LOAD PUMP
TABLE in the Pump file or via the terminal using the L PU (LOAD PUMP) command.
Pump Switch Timer Parameter
The pump switch timer parameter prevents new fueling transactions at a pump when the
handle has been left on from a previous transaction. In this case, when a new transaction is
initiated, the pump cannot reset and, if pumping is allowed, the quantity shown at the pump
includes the previous transaction quantity.
When the pump switch timer parameter is set, the handle is checked at the beginning of each
transaction. If it is found to be on, the user will see the message TURN OFF PUMP HANDLE
and the transaction will be terminated. A transaction is generated with the message PUMP
SWITCH ERROR. The user must turn off the pump handle and begin a new transaction in
order to fuel.
The pump switch timer parameter sets a time period during which the pump is checked. This
time period must be less than the time that it takes for your pump to reset and transmit a switch
detect signal back to the fuel management system. Nearly all pumps take more than one
second to reset and transmit switch detect, so the values for this option range from .1 to 1
second, in tenths of a second, with .5 being a commonly used value. This value may need to be
adjusted for your pumps. A setting of zero disables this option.