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19.0 TROUBLESHOOTING THE DE-2500 CONTROLLER SYSTEM
19.1 The power LED’s on the Power Supply and Terminal Module are blank as well as the LCD
on the display module:
A. Check the power supply voltage at the 12-24 Vdc input terminals; should be between
12 and 24 Vdc.
B. Check the power supply power fuse and replace if blown. NOTE: A spare fuse (part
number 601653 - 6.3 amp) is provided on the power supply board.
C. If the Terminal Module power LED or the Display Module LCD is not on, make sure the
25-pin connectors and cable assembly are connected and secured.
19.2 The normally open sensors do not cause a fault:
A. Make sure the power supply minus terminal is grounded to the panel and the panel is
grounded to the engine block. They must all be at the same potential for normally open
sensors that use the engine block as a return path. Use an ohmmeter and measure
between the power supply minus terminal and the panel and engine block - this reading
should be less than 2 ohms.
19.3 The output LED’s are changing state but the relays or solenoid valves connected to the
outputs are not tripping:
A. Check that the wiring is correct and check the output module fuse. NOTE: A spare fuse
(part number 601653 - 6.3 amp) is provided on the power supply board.
19.4 The power LED’s are lit as well as the LCD backlighting but the LCD is blank or shows
“WARNING: THE DE-2500 Controller MUST BE CONFIGURED PRIOR TO USE ON AN
ENGINE”:
A. The controller system needs to be configured. See the programming instruction form
DE-2500 PI to configure the system.
19.5 The home screen displays NO COMM. message for either the speed, suction or discharge:
A. Communications from the terminal PCB to the DE-2500 controller have been broken.
Check cable connections.
19.6 The home screen displays dashes for the speed, suction or discharge:
A. A channel was not configured in the initial configuration for that parameter. See the
programming instructions form DE-2500 PI to reprogram the controller system.
19.7 The fault screen shows that outputs one and two should be tripping the fuel valve and shorting
the ignition but the fuel valve and ignition do not trip:
A. Make sure the fuel valve and ignition shutdown lead are wired to power supply terminals
FV1 and FV2 for the fuel valve and IGN+ and IGN- for the ignition shutdown lead.
B. Make sure that Altronic output module 691124 is in power supply output slots OUT 1 and
OUT 2.
19.8 The time and date, after being set (refer to section 14.11 to set the time and date), are not
correct after removing and reapplying the input power:
A. The real time clock/RAM module (U10) needs replaced.
19.9 LCD contrast ratio on the DE-2500 Display Module is either too light or too dark:
A. The contrast ratio needs to be adjusted. See section 16.0 CONTRAST RATIO
ADJUSTMENT in these instructions.
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