Troubleshooting
P/N 06-237041-001 6-3 February 2011
BATTERY DISCONNECTED
FAULT On
Faulty battery connection, no batteries
connected or battery connection is
reversed.
Note: Battery disconnected-fault
messages do not disappear immediately
when corrected. The control unit only
rechecks the battery connection once
every 5 to 10 seconds.
• Check battery connections to Power
Management Unit (PMU) Board J10. Refer
to Figure 1-10.
• Disconnect battery leads from Power
Management Unit (PMU) Board J10 and
use digital volt-ohm meter to measure
battery open-circuit voltage. Replace
batteries if open-circuit voltage is less than
22 Vdc.
• Replace the fuse on the PMU Board if
blown. See Figure 1-10
PMU# PSU1 NOT PRESENT On The PMU is not detecting a power
supply unit on connection 1.
• Check the PSU connection
• Measure PSU #1 output voltage at
terminals 4 & 5 (refer to Figure 2-8).
Voltage should measure 27.6 Vdc.
PMU# PSU2 NOT PRESENT On The PMU is not detecting a power
supply unit on connection 1 or 2.
• If the second power supply unit is not
used, change and upload the configuration
using the PC configuration software or the
control unit menu to disable the second
PSU.
NOTE:
The terms "-VDC" and "+VDC" in the Ground Fault error messages below refer to the measured
ground fault voltage offset, not to the PMU Board terminal J9 itself. If the value of the
voltage offset is too low (less than 6.6 VDC, measured between the Earth Ground stud and PMU J9
(-) terminal), the ground fault is considered a negative
fault. If the value of the voltage
offset is too high (greater than 6.6 VDC, measured between the Earth Ground stud and PMU J9 (-)
terminal), the ground fault is considered a positive fault.
PMU GROUND FAULT -VDC On Low impedance path between negative
field conductor and earth ground.
Normal earth-ground offset voltage is
6.6 Vdc (nom.) relative to system
common (e.g.. PMU J9 (-) terminal, refer
to Figure 2-9)
• Use the control unit menu to view the
ground fault offset voltage.
• Use the control unit menu to execute the
Find Ground Fault option.
• Continuously monitor DC voltage between
earth-ground stud on left side of back box
and PMU J9 (-) terminal. Voltage should
be 6.6 (nom.) Vdc. Earth ground is
positive relative to system common.
• If the menu operation does not find the
origin of the ground fault, remove field
circuits one at a time until earth-ground
offset voltage restores to 6.6 (nom.) Vdc.
• Check for connections to earth ground on
field circuit whose removal restored
proper earth-ground offset voltage.
• If applicable, disconnect USB port-to-PC
connection and check for ground fault.
Table 6-1. General System Events (Continued)
General System Events
Error Message Probable Cause Corrective Action
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