DIAGNOSTIC STATUS CODES
SX TRANSISTOR CONTROL Page 28
January 2000
TRACTION
STATUS CODE
DESCRIPTION OF STATUS CAUSE OF STATUS INDICATION
-27
Control’s power supply is less than 10
Volts DC.
This status code will be displayed when the control’s
power supply is less than 10 volts.
MEMORY RECALL
YES
CORRECTIVE ACTIONS TROUBLE-SHOOTING DIAGRAM
Circuits valid
for
Traction
Controller
SYMPTOM
Line contactor opens and closes, then can only
be closed by opening and closing the key
switch.
POSSIBLE CAUSE
Discharged Battery
•= Check battery to insure proper state of charge.
Voltage may be dropping below 10 Volts DC
under load.
Loose connection at P1.
•= Insure that the wire connection at P1 is tight.
Defective control.
•= Replace controller unit.
NEG
+
-
FU3
KEY
SWITCH
P1
P2
FU5
TRACTION
STATUS CODE
DESCRIPTION OF STATUS CAUSE OF STATUS INDICATION
-28
Motor field current is too high during
the run mode.
This status code will be displayed when the current
draw in the motor field is sustained above a preset
limit for longer than 70 seconds.
MEMORY RECALL
YES
CORRECTIVE ACTIONS
TROUBLE-SHOOTING DIAGRAM
Circuits valid
for
Traction
Controller
SYMPTOM
Control will not operate.
POSSIBLE CAUSE
Continued operation of vehicle in high motor
current condition.
•= Operate vehicle at lower motor current
condition for 70 seconds.
Function 7 is mis-adjusted to allow higher than
normal motor field current.
Adjust function per OEM instructions.
KEY SWITCH
L
P7
P1
P17
P2
P6
P9
P3
P12 P8
P4
P5
SEAT SW.
START SW.
FOR. SW.
REV.
SW.
P10
P18
PY7
PY12
PY10
PY11
SP
P1
P5
P4
P2
F
U
7
TO
ACCESSORIES
FU6
P3
OSCILLATOR CARD
LEFT CONTROL
FU1
STEER
ANGLE
POT
LINE
POWER
CONNECTIONS
LEFT CONTROL
POS
A1 F1
NEG A2
F2
FIELD
ARMATURE
ACC POT
BDI INTERRUPT
+
-
SP
SP
FU4
A1
FU2
P
P
POWER
CONNECTIONS
RIGHT CONTROL
POS A1 F1
NEG
F2
FIELD
ARMATURE
FU5
BRAKE SW.
A2
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