GMG 3394-RT, Service Manual

Section

3394RT---6094RT Scissor Lifts - 

Service Pack

Page 

1

8

5

 - Troubleshooting

GP400 HELP MESSAGES

 (

continued)

FAULT: CHECK PRESSURE SENSOR 

6/2 

The pressure sensor is giving an out-of-range voltage (below 0.5V or above 

4.5V) 

Check for open- or short- circuit wiring; replace pressure sensor and re-calibrate 

load if necessary 

FAULT: CUSTOMER 

1/1 

The 

GP400

 must be configured to the customer requirements – this should have 

been done before the controller was shipped from factory 

FAULT: ENERGIZED LINE CONTACTOR - CHECK P5 WIRING! 

3/4 

There is a voltage on the line contactor coil output, when it should be off 

Check wiring to line contactor coil 

3/2 

FAULT: ENERGIZED VALVE - CHECK P5 WIRING! 
FAULT: VALVE FEEDBACK HIGH - CHECK VALVE WIRING! 

3/2 

There is a voltage on one or more valve outputs, when all outputs should be off 

Check wiring to each valve coil 

FUNCTIONS LOCKED - ARMGUARD 

2/2 

During descent, the 

GP400

 can stop movement for a configurable time (see 

ADJUSTMENTS/ LIFT/ ARMGUARD), to allow a safety check that no-one is 

close to the machine. The operator must release and then re-select DOWN to 

continue lowering (after the delay timeout) 

If the armguard feature is not wanted, set ADJUSTMENTS/LIFT/ 

ARMGUARD/HEIGHT to 101% 

4/4 

FUNCTIONS LOCKED - BATTERY 

Battery voltage is too low (or too high!) to allow movement. 

FUNCTIONS LOCKED - EXTERNAL SHUTDOWN 

2/2 

An external shutdown is preventing functions – check 

DIAGNOSTICS/SYSTEM/MODE/ INTERLOCK to see which external interlock is 

active. 

FUNCTIONS LOCKED - NO VALVE SUPPLY 

2/3 

Check P3-2, which carries power to energize the valve outputs (separate to P3-1 

EMS). 

FUNCTIONS LOCKED - NOT CALIBRATED 

1/1 

If platform overload functions are active (ADJUSTMENTS/OVERLOAD TRIP@, 

LAMP@ or ALARM@ set to a non-zero value) then both height and load must be 

calibrated 

If overload functions are not active, but height-based decisions are active 

(ADJUSTMENTS/ HEIGHT values set to between 1% and 100%) then height 

must be calibrated 

Calibration procedures are accessible from the SETUPS menus