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LED Fault Diagnostics
LEDs 1 - 9 will flash once when the ECU is powered on (LED check)
LED 1 - Failed (RED)
Will activate under the following conditions:
Relay 3 (K3) contact weld
•
Relay 1 and 2 (K1, K2) contact weld
•
Direction input short circuit on control PCB (not wiring loom)
•
Q1 failure
•
Q2 failure
•
Motor disconnected / Open circuit
•
Action:
Reset board, re-check. Test for presence of short circuit.
•
Change PCB
Check motor connections
•
LED 2 - Low Voltage LED (RED)
Will activate when supply voltage (when running under load is <20V
Action:
Check batteries
•
Check cable resistance
•
LED 3 - Current Limit LED (RED)
Will activate when lift stalls or draws excessive run current (>18A)
Action:
Check motor, rollers, weight of user, obstruction of rail
•
LED 4 - Brake LED (RED)
Will activate if there is a brake fault or it is not connected, or if Q6 is
short circuit
Action:
Check brake circuits, check for output voltage
•
Change board
•
58
LED 5 - RMU LED (RED)
Will activate when the RMU switch operates and will be continually
on if the RMU has tripped
Action:
Check RMU operation
•
Check output from ECU
•
Check continuity of Reed switch
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Check continuity of wiring and connections
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Replace RMU switch
•
LED 6 - Halfspeed switch LED (YELLOW)
Will activate when the lift is in half speed i.e. travelling on inside
bend rail section
LED 7 - Slow switch LED (YELLOW)
Will activate when the slowing switch operates
Action:
Use for setting slowing ramps
•
LED 8 - Call exists (YELLOW)
Will activate when a call has been placed and received at the control
PCB
Action:
Lights when call button is pressed and the direction safety circuit
•
is closed
LED 9 - PIC Diagnostics LED (GREEN)
Will pulse once per second indicating correct software operation
Action:
No pulse, reset, re-check
•
Change board
•
LED 10 - 5V LED (GREEN)
Indicates active 5V supply
Action:
No lights, check battery supply voltage, fuses and ultimate limit
•
circuit on all on / off switches
LED 1
LED 2
LED 3
LED 4
LED 5
LED 6
LED 7
LED 8
LED 9
LED 10
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