Jacobsen Eclipse 322, Repair Manual

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4-74 4222983 Second Edition
ELECTRICAL
4
Fault: 48 Volt System Low or Short Run
Time – All Electric Units Only
1. Fault: System voltage drops to 43VDC for 10
seconds or more.
2. Possible root cause(s) and troubleshooting
procedure:
a. High resistance on battery cables or battery
terminals. Visually inspect for corrosion at
terminals. Note that it is necessary to remove
upper batteries to inspect lower ones.
b. Bad battery/batteries
i. Ensure that all batteries are filled with water
(electrolyte.)
ii. Fully charge pack until charger stops. Verify
full charge is indicated on charger and
measure specific gravity of two or three cells.
iii. Perform a discharge test using a 48VDC
digital discharger.
iv. Check correct algorithm is selected on the
charger.
3. Fixes:
a. For issue 2.a: Clean or replace battery cables.
Use proper torque specs.
b. For issue 2.b.i: Add distilled water until plates are
covered. Charge batteries fully. Fill to proper
level.
c. For issue 2.b.ii: If specific gravity is not 1.28
(adjusted to 80
r F (26° C)) charger may be
faulty. Calibrate and/or diagnose using the
service manual.
d. For issue 2.b.iii: If batteries are discharged in
less than 90 minutes, measure individual battery
voltage to determine which one is faulty.
e. For issue 2.b.iv charger algorithm should be 38.
4. If run time is still diminished after performing all the
above procedures, please contact Technical Support
immediately.
Fault: Vehicle Will Not Start – Gas and
Diesel Hybrid Units Only
1. Fault: System voltage is below 38VDC, hence not
enough power in LDU to start vehicle. LDU will not
operate when system voltage is below 38VDC
2. Possible root cause(s) and troubleshooting
procedure:
a. High resistance on buffer battery cables or buffer
battery terminals. Visually inspect for corrosion
at terminals.
b. Bad buffer battery/batteries. Load test buffer
batteries individually using carbon pile tester. A
good battery will maintain 10VDC or higher when
loaded to 200 Amps for 10 seconds.
c. Batteries were discharged due to a sticky
contactor inside the PDU. Charge buffer batteries
and check for power at:
i. MCU or RCU with key ignition OFF. If power
is present, 48VDC switched contactor is
stuck closed.
ii. TCU B+ terminal with key ignition OFF for
more than 5 seconds. If power is present,
traction contactor is stuck closed.
d. 12 volt battery not fully charged
3. Fixes:
a. For issue 2.a: Clean or replace buffer battery
cables. Use proper torque specs.
b. For issue 2.b: Replace faulty buffer
battery/batteries.
c. For issue 2.c.i: Replace 48VDC switched
contactor.
d. For issue 2.c.ii: Replace traction contactor.
e. For issue 2.d: Check 12 volt battery system.
4. If unit still does not operate after performing all the
above procedures, please contact Technical Support
immediately.