No Power At Platform Control - JLG 10VP Service And Maintenance Manual

SECTION 3 - TROUBLESHOOTING

No Power At Platform Control

Overview Of Procedure
The following procedure checks voltage and ground starting from the power source (batteries) through the ground control
station (key switch/E-stop) to the MC-1 box and finally to the platform control.
Check For These Obvious Conditions First:
• Battery voltage 24 volts. (Fully charge batteries)
• Keyswitch is turned to PLAT. (Platform)
• Both Emergency Stop Switches Reset (Ground/Platform). (Out)
• Connection of X102 Cable from MC-1 box to Platform Control, secure on both ends.
STEP
1. Check if the inline 5 amp fuse is blown on the Red, 1-1 wire at the
ground control station. (Ground control cover must be removed)
Check voltage to the Yel/Red, 2-2 wire at the MC-1 box, X101 con-
2.
nector, pin 3.
3. Check for Ground to the Black wire at the MC-1 box, X101 connec-
tor, pin A2.
4. Check voltage to the Yel/Red, 2-3 wire at the MC-1 box, X101 con-
nector, pin 5.
Check voltage to the Yel/Red, 2-5 wire at the MC-1 box, X101 con-
5.
nector, pin A1.
6. Check voltage to the Yel/Red, 2-2 wire at the MC-1 box, X101 con-
nector, pin 3, from the Power Relay pin 30.
Check voltage to the Power Relay, pin 87.
7.
8. Check for Ground to the Power Relay on the Black wire pin 85, to
Ground.
9. Check voltage to the Yel/Red, 2-4 wire at the Main Contactor from
the Power Relay, pin 87.
Check for Ground, on the Black wire to the Main Contactor.
10.
Check voltage at the Battery Cable from Battery to Main Contactor.
11.
Check voltage to the Yel/Red, 2-5 wire at the Main Contactor.
12.
3-18
Table 3-5. No Power At Platform Control.
ACTION
– JLG Lift –
SPEC YES
— If OK, go to Step 2
24 volts Go to Step 3
Ground Go to Step 4
24 volts Go to Step 5
24 volts Go to Step 13
24 volts Go to Step7
24 volts Go to Step 9
Ground Replace Relay
24 volts Go to Step 10
Ground Go to Step 11
24 volts Go to Step 12
Check Yel/Red 2-
24 volts
5 Wire
NO
Replace Fuse
Perform the E-
Stop/Key Switch
Circuit Check
(Table 3-17)
Check connec-
tion/wiring
between Battery
and X101, Pin A2
Replace MC-1
Control Box
Go to Step 6
Check the wire
between the
Power Relay and
Connection
Go to Step 8
Check wiring to
Ground
Connection
Check the Yel/
Red, 2-4 Wiring
Check wiring to
Ground
Connection
Check Battery
Cable
Replace Main
Contactor
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