DIAGNOSTIC STATUS CODES
IT TRANSISTOR CONTROL
Page
33
April 2012
TRACTION
STATUS CODE
DESCRIPTION OF STATUS
CAUSE OF STATUS INDICATION
-77
Capacitor (1C) voltage too high during
motoring.
This status code will be displayed when the voltage at
1C exceeds 96 volts during motoring.
MEMORY RECALL
YES
CORRECTIVE ACTIONS
TROUBLE-SHOOTING DIAGRAM
Circuits valid
for
Traction
Controller
SYMPTOM
Line contactor opens and closes, then
opens and can only close by opening and
closing the key switch.
POSSIBLE CAUSE
Regen current too high, cycle key
switch off then on.
Defective control.
Replace controller unit.
TRACTION
STATUS CODE
DESCRIPTION OF STATUS
CAUSE OF STATUS INDICATION
-81
No tachometer signal is detected.
This status code will be displayed when no
tachometer signal is detected.
MEMORY RECALL
YES
CORRECTIVE ACTIONS
TROUBLE-SHOOTING DIAGRAM
Circuits valid
for
Traction
Controller
SYMPTOM
Vehicle’s speed will limited to about
half of the normal speed.
POSSIBLE CAUSE
Defective tachometer.
Replace tachometer unit
Defective wiring between tachometer
and the control.
Check and repair wiring as required.
Stalled motor
Cycle key switch off then on.
L
P9
P7
P8
P1
P17
P2
P6
P4
P5
TU
RF SW
.
FO
R
W
A
R
D SW
.
REV
E
RS
E SW
.
ACC POT
TACHOMETER
P15 P14 P16
P10
BU
ZZ
ER
RE
D
GR
E
E
N
BL
AC
K
P12
REGEN
B
R
AK
E S
W
P21
MO
T
O
R
OV
ER T
E
MP
+72V
+72V
+72V
+72V
+72V
+72V
+72V
P22
P23
P20
RS232
72V
NEG
P3
NE
G
I
N
PUT
ST
A
R
T SW
.
72V
NEG
P13
NE
G
I
N
PUT
BR
AKE
S
W
.
72V
NEG