4.3 - Upright Motor Controller Diagnostics; Table 4-2: Motor Controller Diagnostics - Upright TM12 Service & Parts Manual

Troubleshooting
4.3 U R M
P IGHT

Table 4-2: Motor Controller Diagnostics

Flash Code Meaning
Power to the controller and the
LED on
controller is operational.
No power to the controller, or
LED off
internal fault in the controller.
2 Flash Procedural fault.
Controller senses B- at the M2
3 Flash
terminal.
Controller senses B+ at the M2
4 Flash terminal before engaging the
motor start relay.
Controller senses open circuit at
5 Flash M2 after engaging the motor start
terminal.
Faulty signal from control handle
6 Flash
or I/O board.
Battery voltage below 12V or
7 Flash
above 45V.
8 Flash Thermal cut-off.
LED Indicator
TM12 Work Platform - European
C
OTOR ONTROLLER
Batteries must be fully charged before troubleshooting.
Check/Repair all connections before replacing any components
Status
System is functional
Battery cables not connected properly;
Failed controller
Lift, drive, or steer switch is engaged at
startup; Drive/Lift Switch rotated while
operating
Short circuit at the motor; M2 cable in
contact with B- cable; Short circuit within
controller
B+ cable routed incorrectly; M2 cable
making contact with B+ cable; Motor
start relay contacts welded closed.
Cables loose or not connected; Faulty
motor start relay
Faulty control handle; Wiring error
Dead batteries; Bad cable connections
Controller is overheated due to overuse
or other failure

4.3 - UpRight Motor Controller Diagnostics

D
IAGNOSTICS
Corrective Action
None.
Check battery cable connections.
Replace the controller.
Cycle the control handle through neutral to clear fault.
Check cable routing and connections.
Test terminals for source of B-.
Replace the controller
Check cable routing and connections.
Test terminals for source of B+.
Replace the motor start relay.
Check the cable routing and connections.
Check the signal from motor controller to relay.
Check/replace the motor start relay.
If upper controls are affected, check/replace the control handle.
If lower controls are affected, check/replace the I/O board.
Check batteries and cable connections.
Allow system to cool.
Locate and repair other source of overheat.
B- Terminal
M2 Terminal
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