Tennant 7200, Service Manual

Page: 247 / 272

ELECTRICAL
4-89 7200 330045 (10--99)
Step 2. Connect the programmer, put it in
diagnostic mode, and read the display fault
information. In this example, the display
shows ”No Faults Present” indicating that
the controller has not detected anything out
of the norm.
Step 3. Put the programmer in test mode, and
observe the status of the inputs and outputs
in the forward direction. In this example, the
display shows that the forward switch did not
close when ”forward” was selected, which
means the problem is either in the forward
switch or the switch wiring.
Step 4. Check or replace the forward switch and
wiring and repeat the test. If the programmer
shows the forward switch closing and the
vehicle now drives normally, the problem
has been corrected.
NOTE: Refer to the troubleshooting chart (table 2)
for suggestions covering a wide range of possible
faults.
TABLE 2: TROUBLESHOOTING CHART
LED
CODE:
PROGRAMMER LCD
DISPLAY:
EXPLANATION:
POSSIBLE CAUSE:
1 -- 2 HW FAILSAFE Hardware fail--safe
error
1. Controller defective.
1 -- 3 M-- FAULT M-- output shorted 1. M-- output shorted to
ground
2. Direction contactor not
closing
3. Direction contactor not
closing fast enough
4. Internal motor short to
ground
1 -- 4 SRO SRO fault 1. Improper sequence of KSI,
brake, and direction inputs.
2. Wrong SRO type selected
3. Brake or direction switch
circuit open
4. Sequencing Delay too short
2 -- 1 THROTTLE FAULT 1 5k W --0 or wiper fault 1. Throttle input wire open.
2. Throttle input wire shorted
to ground.
3. Throttle pot defective.
4. Wrong throttle type
selected.
2 -- 2 BB WIRING CHECK Emergency reverse
wiring fault
1. BB wire open.
2. BB check wire open.
2 -- 3 HPD HPD sequencing fault 1. Improper sequence of KSI,
brake, throttle inputs.
2. Wrong HPD type selected.
3. Mistrusted throttle pot.