Upright LX31, Руководство по обслуживанию

Страница: 56 / 120

4-6 LX31/41 Electric Work Platform
T
R O U B L E S H O O T I N G
Section
4.4
4.4 T
ROUBLESHOOTING THE
MOS90
Important basics applicable to the motor control unit.
•
The MOS90 has a green diagnostics L.E.D. in the
front panel.
• The green L.E.D. will turn on and shine continu-
ously when the MOS90 is powered up and work-
ing correctly.
• The green L.E.D. will be off if no power is sup-
plied to the MOS90.
• The green L.E.D. will flash a sequence of flashes
if the MOS90 is damaged or is receiving an
improper signal. An explanation of the flash
sequences "flash faults" is shown on the following
pages.
• The MOS90 is high temperature protected by
"thermal cutback". The cutback operates
between 80° C (176° F) and 90° C (194° F). Pow-
ered functions will gradually operate slower and
slower until 90° C (194° F). The MOS90 will shut
down at 90° C (194° F). Continued operation at
high temperature will damage the MOS90.
• The MOS90 is low voltage protected by "low volt-
age cutout". The MOS90 shuts down at 14.0
VDC. Powered functions suddenly stop. When
input voltage goes above 14.0 VDC turns back
on.
When a Flash Error occurs
Step 1.
Disconnect the 17 pin connector from the MOS90.
Wait Five (5) seconds and plug it back in again. If the
flash error repeats go to step Two (2). If the green
L.E.D. lights up and stays on continuously - operate
machine. Note which functions are being used when
problem repeats itself.
Step 2.
Disconnect the 17 pin connector from the MOS90.
Connect pin Six (6) to a fused battery supply (14.0
VDC minimum) and observe the green L.E.D. If flash
error stays, replace MOS90. If green L.E.D. lights up
and remains on continuously, check wiring.
NOTE: Troubleshoot the possible cause of the
flash error before replacing the MOS90, for
example an Eight (8) flash error will cure
itself when the MOS90 cools down.
4.5 U
SING THE
C
ALIBRATOR
The calibrator has 20 L.E.D. segments marked as
shown.
Figure 4-1: MOS90 Calibrator LED Segments
The values which should be expected when checking
the machine are shown on the following page.
There are three buttons on the calibrator:
increment,
decrement, marked -
select
When select is pressed, each L.E.D. will light in
sequence until the select button is released. Each
setting can be incremented or decremented using the
+ or - buttons when the adjacent L.E.D. is lit.
When "Test" L.E.D. is lit, the state of the MOS90
inputs is displayed. The first input displayed is the
accelerator which can vary from 0-100%. When the +
button is pressed once the switch Input 1 is dis-
played. This will be seen as "1.0P" until the switch
Input voltage changes. "1.CL" will then be displayed.
This is repeated for all the switch inputs.