No Emergency Down Function From Base Control Console - Skyjack SJ3220 Service Manual

Electrical System
6. Loose or broken wire #00C from Holding valve
coils to Control Module CM1 pin #P2-8.
7. Defective Lift cylinder Holding valve coil 2H-13-1
or 2H-13-2.
8. Machine overloaded and Overload Lights PL-1
and PL-2 on Emergency Stop buttons flashing
9. External or internal fault detected by Control
Module CM1.

4.2-6 No Emergency Down Function from Base Control Console*

NOTE
*circuit has redundant wiring and a multiple position (left-spring neutral center-right) Emergency
Lowering toggle switch S51, which will allow function of lowering in either position from neutral center .
(see below scenarios)
1. Loose or broken wire #98 from Battery to Circuit
Breaker CB2 or the circuit breaker is open.
2. Loose or broken wire #98A from Circuit Breaker
CB2 to Main Disconnect S1.
3. Main battery disconnect switch S1 open or
defective.
Scenario A:
Emergency Lowering toggle switch S51 held in "up" position as per electrical schematic.
▪
Loose or broken wire #98B from Main
▪
Disconnect S1 to Emergency Lowering switch
S51.
Loose or broken wire #05 from Circuit Breaker
▪
CB1 to Emergency Lowering switch S51.
Open or defective Emergency Lowering switch
▪
S51.
SJ3220, SJ3226, SJ4720, SJ4726, SJ4732
Section 4 – Troubleshooting Information
Check continuity. Replace if defective.
Check continuity through coil. Replace if defective.
Check machine limits and reduce weight as
required.
Check Pressure Transducers PT1 and Angle
Transducers AT1 and AT2 functionality
Check wire #60 from Control Module CM1 pin
#P1-8 (overloaded signal)
Test for 24V Output voltage between wire #60 and
wire #02.
Use HMI Diagnostic menu to make sure Output
P1-8 signal is present (pulsed).
Check Control Module display screen. Use
Diagnostic Menu to see switch and sensor status.
Correct trouble code as displayed. Replace module
if defective.
Check continuity to circuit breaker. Test Circuit
Breaker CB2. Replace if defective.
Check continuity. Replace if defective.
Close switch. Check continuity. Replace if
defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity between wire #98B and wire
#00D on switch, and check continuity between wire
#05 and wire #13 on switch.
Replace switch if no continuity on both of these two
(2) contacts of switch.
223198ABA
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