Zapi EPS-ACW User Manual page 73

- Remedy:
AF9ZP0BA - EPS-ACW REACH TRUCK - User Manual
feedback sensors. Here we have an encoder and one (two)
toggle switches.
This alarm occurs whether the sector (toggle switches
configuration) and the encoder counting are not matched. The
sector is provided with the FEEDBACK SECTOR reading in the
tester menu (see 13.3.8.2); the encoder counting is provided
with the STEER ANGLE reading in the tester menu.
In case of two toggle switches:
STEER ANGLE
[degrees]
-15 to +15
+15 to +75
+75 to +105
+105 to +165
+165 to -165
-165 to -105
-105 to -75
-75 to -15
In case of one toggle switch:
STEER ANGLE
[degrees]
+15 to +165
-165 to -15
When the FEEDBACK SECTOR and STEER ANGLE don't
meet the above correspondence, an alarm POSITION ERROR
occurs in less than 100msec.
NOTE: The thresholds of the STEER ANGLE admitted for every
FEEDBACK SECTOR reported in the above tables, refers to an
ideal case with STEER 0-POS DEG set to 0 degrees (no offset
between SW1 and null angle) and a cam 180 degrees long. The
real thresholds affected by SW1 offset and cam length are
shown real time on the FEEDBACK SECTOR reading.
If the alarm occurs when installing a new controller, be sure the
AUX FUNCTION 11 corresponds to the toggle switches
arrangement you have (see 12.3 and 12.4) and PULSE IN 180
DEG. was correctly set (see 12.5 and 12.6).
If the alarm occurs after the set-up was correctly performed,
search for a failure on a toggle switch or on the encoder.
The troubleshooting consists of comparing STEER ANGLE and
FEEDBACK SECTOR when this alarm occurs. In case of an
alarm, they are expected to infringe the admitted
correspondences of the above tables. Then the problem could
be in a sensor (check PROX SWITCH 1 and PROX SWITCH 2)
or in the encoder (check STEER ANGLE and FEEDBACK
SECTOR).
A list of possible failures mode follows:
1. A switch changes its level despite it is not engaged by the
iron plate (cam) on the steered wheel.
2. If the encoder consists of a sensor bearing, a ring of the
sensor bearing has a slip (the sensor bearing has two rings:
one is connected to the rotor shaft; the other is connected to
the motor frame). Check these two rings are strictly
Admitted
FEEDBACK SECTOR
st th
1 or 4
st
1
st nd
1 or 2
nd
2
nd rd
2 or 3
rd
3
rd th
3 or 4
th
4
Admitted
FEEDBACK SECTOR
st
1
th
4
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