Taylor-Dunn B0-T48-48 Taylor Truck T48, Operation, T Roubleshooting And Replacement Parts Manual

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Sevcon Troubleshooting
Page 19
Electrical Troubleshooting
Status LED Code Table
The status LED on the Sevcon power unit logic card can be used to give you an idea of where
the problem may be. It is recommended that you complete the troubleshooting procedure to
confirm failure of any component.
# of
Flashes
Description Possible Cause Action
1 Personality fault
Corrupted controller
program or faulty logic card
Attempt reprogram or replace
controller
2 Sequence fault
Startup switches not
operated in the correct
order
Reset the switches and start over
(Refer to Vehicle Operating
Instructions)
3 MOSFET fault
Shorted controller or motor Repair as required
See note
4
Line contactor fault or
open motor
• Contactor failure
• Open motor circuit
Check contactor and motor
5 Not used - -
6 Throttle fault
• FS-1 switch failure
• Faulty wiring
• Throttle module Failure
Check throttle module and wiring
7 Low battery volts
Discharged battery or loose
connections
Check battery and connections to
controller
8 Controller overheated Overloaded vehicle Wait for controller to cool
9
Line contactor coil
shorted
Line contactor coil short
circuit or faulty wiring
Check coil continuity and replace as
required
10 Not used - -
11 Not used - -
12 Can Buss Fault
Fault in the wiring to the
dash display or a faulty dash
display
Check wiring. If vehicle is not
equipped with a dash display, check
for debris in the 6-pin connector on
the logic card
Note
Flash code 3 can also be a result of a missing buss bar between the B+ and R terminals on the
controller