Big Joe J1-192 Maintenance Repair Parts Manual page 33

Table 3-4 Troubleshooting Chart (EPS-AC0 Controller) - Continued
ERROR ERROR TEXT
228 POSITION ERROR
238 EPS NOT ALIGNED
239 WAITING FOR TRAC
241 ENCODER ERROR
242 Q LINE SENSOR KO
243 D LINE SENSOR KO
BL-J1-192-0315 - 11-19-2019
POSSIBLE CAUSE
This alarm occurs for an error in the
redundant test o the feedback sensors.
This is a real alarm that cuts off the trac-
tion. It occurs at the initial alignment if
the straight-ahead condition is not
matched within 6 sec. Throughout this
6 secs delay, the steer is not activated
yet, the safety relays are open and the
traction is stopped.
At key-on the eps-ac0 needs an assent
from the traction controller to close the
safety contacts and to turn on opera-
tional mode. Until this assent is not
relieved, this warning occurs. The
steer is not activated yet and the safety
relays remain open when this warning
is present.
It occur when ENCODER CONTROL is
set ON and the real frequency does
not pursuit the commanded frequency.
This alarm occurs when the mean volt-
age on the Quadrature line of the step-
per motor (connection CNA#8) is not
null: the voltage on every stepper
motor line is a sine wave with null
mean voltage.
This alarm occurs when the mean volt-
age on the Direct line of the stepper
motor (connection CNA#9) is not null:
the voltage on every stepper motor line
is a sine wave with null mean voltage.
FAULT CLEARANCE
Check the potentiometer connected to
CNB#6 is working correctly. If toggle
switches are connected to CNA#2 and
CNA#3, verify that they are working cor-
rectly and setting AUX FUNCTION 11 is
correct. Also the sensor bearing in the
motor (encoder). The sensor bearing
has two rings: one connected to the
rotor safety; the other is connected to
the motor frame. Check these two rings
are strictly connected to their structure
without slip.
This condition occurs several times due
to either, a mismatch between the
Encoder resolution used in the SW and
the real encoder resolution, or a wrong
connection between th4e two encoder
channels. In this latest case exchange
in between the two encoder channels.
Check continuity of the stepper motor
connections. In particular the resis-
tance between CNA#8 and the minus
battery (with the stepper motor at rest)
is expected to be very low (close to 30
ohms).
Check continuity of the stepper motor
connections. In particular the resis-
tance between CNA#9 and the minus
battery (with the stepper motor at rest)
is expected to be very low (close to 30
ohms)
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