EP Equipment CQD16, Service Manual

Page: 159 / 251

REV. 07/2016
ELECTRICAL SYSYTEM
8
145
Error Message
Possible cause Fault elimination
Error Error text
247 CAN BUS KO
This alarm occurs only when the
setting CAN BUS is PRESENT.
Then the eps-ac0 must receive the
event messages from the traction
controller. If these messages lack
more than about 1 sec, this alarm
occurs.
C h e c k t h e C A N B u s
communication system and
analyse the frames from
the traction controller to the
steer controllers.
248 S.P OUT OF RANGE
This alarm occurs for a fault on the
command potentiometer (CPOC1
on CNA#9, CPOC2 on CNA#8).
When a single command pot is
chosen, the alarm occurs if its wiper
(CPOC1) exits the range from 0.8
Vdc to 4.2 Vdc. When the twin
pot is chosen, the alarm occurs if
the sum of the two wiper voltages
(CPOC1+CPOC2) exits the range
from 4.5 Vdc to 5.5 Vdc.
Check the connections of
the potentiometer. This
alarm occurs when one
connection of the command
potentiometer is broken.
249 F.B OUT OF RANGE
This alarm occurs for a fault on the
feedback potentiometer (CPOT on
CNB#6). This alarm occurs if CPOT
exits the range from 0.3 Vdc to 4.7
Vdc. Check the connections of
the feedback potentiometer.
This alarm occurs when one
connection of the feedback
potentiometer is broken.
250 MICRO SLAVE
It occurs when the information on
the status bus between the main
uC and the slave uC is frozen
to the 0xFF value (the slave uC
does not update the status bus
con
fi guration).
It is necessary to replace
the controller.
251 KM OPEN
This alarm occurs if the slave uC
detects the safety contact, of the
main uC, open when expected
being closed.
It is necessary to replace
the controller.
252 KS OPEN
This alarm occurs if the main uC
detects the safety contact, of the
slave uC, open when expected
being closed.
It is necessary to replace
the controller.