Service Manual

Fault
Number
Fault Title
Controller
Affected
Fault Condition/
Circuit
Description
Additional Notes
Service Actions
(Repair or replace any
worn or damaged parts)
78
48V Key Switch Low
Voltage – Cutting
Reel Motor 3
Cutting Reel
Motor Controller
A key switch
undervoltage fault is
reported when the
cutting reel motor
measures a logic
voltage lower than 32
Vdc.
• For this fault, the term “key
switch” refers to the 48 Vdc
logic power circuit, not to the
ignition switch.
• If more than 1 cutting reel
motor is reporting a key
switch undervolt fault, the
problem is more likely to be
with the 48 Vdc system
voltage. Perform the
Recommended Service
Actions for fault 31.
1) Inspect the wiring for cutting
reel motor 1 for damage,
corrosion, foreign debris, and
proper alignment and seating of
the pins inside the connectors.
2) With the ignition key on, check
for 48 Vdc power in connectors
P40 and P41.
3) Perform resistance tests for 48V
logic power in main harness
connectors P40 and P41.
4) Swap cutting reel motors
between cutting units and
replace cutting reel motor if
faulty.
79
48V Key Switch Low
Voltage – Cutting
Reel Motor 4
Cutting Reel
Motor Controller
A key switch
undervoltage fault is
reported when the
cutting reel motor
measures a logic
voltage lower than 32
Vdc.
• For this fault, the term “key
switch” refers to the 48 Vdc
logic power circuit, not to the
ignition switch.
• If more than 1 cutting reel
motor is reporting a key
switch undervolt fault, the
problem is more likely to be
with the 48 Vdc system
voltage. Perform the
Recommended Service
Actions for fault 31.
1) Inspect the wiring for cutting
reel motor 1 for damage,
corrosion, foreign debris, and
proper alignment and seating of
the pins inside the connectors.
2) With the ignition key on, check
for 48 Vdc power in connectors
P48 and P49.
3) Perform resistance tests for 48V
logic power in main harness
connectors P48 and P49.
4) Swap cutting reel motors
between cutting units and
replace cutting reel motor if
faulty.
Reelmaster 5010-H Diagnostic Fault Code Quick Reference Table Page 20 of 38