Oem Controller Troubleshooting - Skyjack SJ 3215 Service Manual

Service and Maintenance
5.1-2

OEM Controller Troubleshooting

Problem
1. The function will not operate when the handle is
moved. The LEDs 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.
D. 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 LEDs will not light.
F. Check that valve wiring is not open. The
LEDs 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. P e r f o r m " T h r e s h o l d " a d j u s t m e n t
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.
SKYJACK, Page 4
IRS 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 System (IRS)
Provides smooth function response ,when reacting
to an abrupt change in handle deflection. "CW" rota-
tion of the trimpot increases ramp time and slows the
response time. "CCW" decreases ramp time and in-
creases 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.
wARNiNG
Do not use RTV silicone.
Section 5 - Procedures
SJIII Series