Em Joystick - Troubleshooting Procedures - Skyjack SJIII Series Maintenance & Parts Manual

Problem
1. The function will not operate when the handle is moved. The LE s do not light
A. Check that voltage is present at the positive (+)input terminal.
B. Check that ground is connected to the negative (-) terminal.
C. If there is an in-line fuse, check to see if it is good.
. Check the controller on/off switch and the connectors. Voltage should
be present at the (X) terminal when the controller is turned on.
E. Check that valve wiring is not shorted to ground. The LE s will not light.
F. Check that valve wiring is not open. The LE s will light, but the
intensity will not vary.
G. Check trimpot settings. Fully "CCW" turns output off, "CW" turns
output fully on.
2. The function jumps or lurches when turned on.
A. Perform "Threshold" adjustment procedures.
3. The function reaches maximum speed before the handle is fully deflected,
A. Perform "Maxout" adjustment procedures.
4. The function speed remains constant regardless of the degree of handle deflection.
A. Perform "Maxout" adjustment procedures. "
IR Option
1. Function speed reacts too slowly or too quickly in relation to handle deflection.
A. Check "IRS" (Ramp) trimpot adjustment. "CW" increases ramp
time, "CCW" decreases ramp time.
Integrated Ramp ystem (IR )
Provides smooth function response ,when reacting to an abrupt change in handle deflection. "CW" rotation of the
trimpot increases ramp time and slows the response time. "CCW" decreases ramp time and increases the response
time. To increase the ramp time, turn the adjusting screw "CW" a few turns, then move the controller handle abruptly.
Continue to adjust until a smooth response is observed. Most controllers have on/off contacts which remove power
from the P .C. Board when the handle is returned to the off position. When the handle is abruptly returned to neutral,
the output will not ramp down, and the function will stop.
Ramp Thru Off
The P .C. Board should be adjusted as outlined in the IRS adjustment procedure. If the handle is abruptly returned to
neutral (OFF) the output will ramp down to off. Ramp time is factory set to 2 seconds, unless otherwise specified.
Note: Trimpots should be sealed with nail polish or enamel based paint.
DO NOT U E RTV ILICONE
ECTION 5, Page 8
OEM Joystick - Troubleshooting Procedures
SJIII Series - The Compacts 118941