T M 1 0 - 4 6 1 0 - 2 3 2 - 12
Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CARBON MONOXIDE (CO) MONITOR.
1. Alarm does not activate at 25 or at 50 ppm display.
Adjust setpoints (para. 4-63).
Notify direct support maintenance.
2. Monitor does not dispfay.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
NOTE
The monitor will work on either 28 VDC or 115VAC. It does not require both voltages
for operation. The monitor will automatically work off of the higher voltage that ap-
pears at its terminals.
Open the monitor and check for 110-120 VAC across terminals ACHI and ACLO. Check for 24-28
VDC across DC+ and DC-.
(a) If 24-28 VDC is not present, go to step 3.
(b) If 110-120 VAC is not present, go to step 6.
Reset the circuit breaker.
If the monitor does not display, notify direct support maintenance.
Disconnect the 28 VDC supply connector 2A at the power supply. Test the CO monitor fuse and check
for continuity across the fuse
(a) Replace the fuse if it is blown (para. 4-63).
(b) If the monitor does not show a display after replacing the fuse, notify direct support mainte-
nance.
Check if the diesel fuel heaters operate.
Refer to power suppIy troubleshooting if the heaters do not operate.
Disconnect the 28 VDC supply connector 2A at the power supply. Disconnect the 115 VAC connector
3A at the power supply. Check continuity from the power suppIy + terminal to DC+ in the monitor.
Check continuity from the power supply - terminal to DC-in the monitor.
If either wire is open, notify direct support maintenance.
Shut down the ROWPU. Shutdown the generator. Open the control panel and check continuity from
terminal strip 1-52 to ACHI in the monitor. Check continuity from terminal strip 1-88 to ACLO in the
monitor.
If either wire is open, notify direct support maintenance.
DIESEL HEATERS.
W A R N I NG
Electrical high voltage can cause serious injury or death. Some tests performed in
troubleshooting require power to be connected. Always take proper measures to en-
sure personal safety.
NOTE
Diesel heater wiring diagrams are shown in Figure 4-5.
NOTE
Ensure that all circuit breakers are set before troubleshooting.
4-68
