Fault 85: 48V Key Switch Overvolt-Crm 4 - Toro Reelmaster 5010-H Diagnostic Manual

Fault 85: 48V Key Switch Overvolt—CRM 4
Important:
For this fault, the term "key switch" refers to the 48 Vdc logic power circuit, not to the
ignition switch.
Note:
When any individual cutting reel motor is shut off due to a fault, the TEC-5002 shuts off the other 4
cutting reel motors.
Note:
If multiple machine faults are reported within a few seconds, troubleshooting should begin with the
first cutting reel motor to report a fault.
InfoCenter Display:
Fault Description
Cutting reel motor 4 has detected that the 48 Vdc logic voltage has exceeded the high voltage limit. This
fault causes the cutting reel motor to be disabled.
Note:
All 48 Vdc devices are connected to the same 48 Vdc bus. If this is a system issue, the TEC-5002
combines all 6 48 Vdc Key Switch Overvolt faults (faults 82 through 87) into a single fault (code 31, 48 Vdc Key
Switch Overvolt).
Circuit Description
All 5 cutting reel motors share the 48 Vdc logic power with the motor/generator.
Conditions for Setting the Fault
Cutting reel motor 4 has detected that the 48 Vdc logic voltage has exceeded the high voltage limit of 67.5 Vdc.
Note:
This fault can also occur if the TEC-5002 loses communication with the motor/generator and reverts
to limp mode. When the TEC-5002 loses communication, it loses engine speed control, and the mechanical
governor limits engine speed to 3,200 rpm.
Recommended Service Actions
Step 1: Verify that the fault repeats.
1. Clear the system faults from the InfoCenter. Refer to
2. Operate the machine.
Pass The fault did not repeat. Go to
Note:
If the fault does not repeat, an isolated event has occurred.
Fail The fault repeated. Go to Step 2.
Step 2: Determine the troubleshooting strategy.
If only 1 cutting reel motor is reporting a 48V Key Switch Overvolt fault, the problem is more likely to be with the
48 Vdc logic power connection to that cutting reel motor. Go to Step 3.
_____FAULT #85_____
V
48V HI
Clearing Faults from the InfoCenter (page
Returning the Machine to Service (page 22)
325
4
and follow the steps listed.
21).