Compac CNG

Diagnostic and Output LEDs
Indicator LEDs
Compac Industries Ltd.
Page 72
www.compacngv.com
Diagnostic and Output LEDs
The diagnostic and output LEDs indicate the operational state of the
dispenser.
Diagnostic LED
The diagnostic LED D18 flashes in three different states when the
processor is working properly, as outlined in the table below.
State
LED Flashes
When
1
Slowly and
consistently.
The hose is idle and in stand-
alone mode.
2
Slowly but
erratically.
The hose is idle and
communicating with a
Controller.
3
Quickly.
Start button is being pressed
or the nozzle has been lifted
from its holster.
Output LED
The 10 output LEDs (D8-D17) pictured correspond to the output triacs,
which engage power terminals (T1-T10).
When the output triac switches on and engages a power terminal, the
corresponding output LED lights up. When the power is disengaged, the
LED is not lit.
The output LEDs can be used to troubleshoot problems with the
components supplied by the power terminals.
The table below outlines which LED is associated to which power terminal
and the component that it controls.
LED
Power Terminal
Component Controlled
D8
T1
Solenoid Low Bank Side A.
D9
T2
Spare.
D10
T3
Solenoid Medium Bank Side A.
D11
T4
Solenoid High Bank Side A.
D12
T5
Spare.
D13
T6
Solenoid Low Bank Side B.
D14
T7
Solenoid Medium Bank Side B.
D15
T8
Finished dispensing. (Turns off
when the nozzle is stowed.)
D16
T9
Solenoid High Bank Side B.
D17
T10
Error indication.
The Solid State Relays (Triacs) Layout and Function part of the C4000
Supply Board section (see page 92) show the physical locations of triacs
and power terminals.