Upright Motor Controller Diagnostics; Figure 4-1: Motor Controller; Table 4-1: Led Fault Codes - Upright SL20 Series Service & Parts Manual

4.3 U M
PRIGHT

Table 4-1: LED Fault Codes

Flash Code
LED on The controller is operational.
LED off There is no power to the controller. The fault is internal.
Procedural fault. Lift, drive, or steer switch is engaged at
2 Flash
startup, or lift and steer are attempted at the same time.
3 Flash Permanently low power output from M2 t.erminal
4 Flash Permanently high power output at M2 terminal.
Power output at M2 terminal does not match the position
5 Flash of the control handle (i.e. High output when handle is in
neutral, or low output when movement is attempted).
6 Flash Control handle fault.
Battery voltage fault. Voltage has dropped below 12 volts
7 Flash
or exceeded 45 volts
Thermal fault. Heat sink temperature has exceeded 80
8 Flash
degrees Celsius.

Figure 4-1: Motor Controller

SL20
Troubleshooting - 4.3 - Upright Motor Controller Diagnostics / Adjustment
C
OTOR ONTROLLER
Batteries must be fully chargesd before troubleshooting.
Check/Repair all connections before replacing any components
Status
D
IAGNOSTICS
None.
Replace the controller.
Turn the chassis key switch to off. Make sure that the control handle and steering
switch are in neutral. Turn Chassis key switch on.
Replace the controller.
Check/Replace motor contact.
Check/Replace motor.
Check/Replace motor contact.
Check/Replace controller.
Check/Replace motor
Check/Replace control handle
Turn Chassis Key Switch off. Make sure that the control handle and steering switch
are in neutrol. Turn Chassis Key Switch on. Drive slowly to charging station.
Automatically clears when controller cools.
LED Indicator
Procedures
Corrective Action
M2 Terminal
Page 4-3