Fault 93: 48V Bus Undervolt-M/G - Toro Reelmaster 5010-H Diagnostic Manual

Fault 93: 48V Bus Undervolt—M/G
InfoCenter Display:
Fault Description
The motor/generator controller has detected that the 48 Vdc bus dropped below the low voltage limit.
Circuit Description
The motor/generator supplies the 48 Vdc bus power to the 48 Vdc battery pack.
Conditions for Setting the Fault
When the M/G controller detects that the 48 Vdc bus has dropped below the low voltage limit of 36 Vdc,
the M/G controller disables its motor. The TEC-5002 filters this fault and allows it to occur only when the
motor/generator contactor is closed.
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 the motor/generator is reporting a 48 Vdc Bus Undervolt, the problem is more likely to be with the 48 Vdc
bus connection to the motor/generator. Go to Step 3.
If more than 1 cutting reel motor and the motor/generator are reporting a 48 Vdc Bus Undervolt, the problem is
more likely to be with the 48 Vdc bus voltage. Perform the Recommended Service Actions for
Battery Low Voltage (page
Step 3: Test the main 48 Vdc contactor.
1. Raise and support the operator's seat, then remove the cover from the main contactor. See
_____FAULT
48V
Returning the Machine to Service (page 22)
101).
#93_____
Bus V
LO
Clearing Faults from the InfoCenter (page
362
21).
and follow the steps listed.
Fault 29: 48V
Figure 155.