Page - 42/95 AEMZP0BA - EPS-AC0 - User Manual
10 INSTALLATION PROCEDURE
As stated in the topic 4.5 there are two equipments that it is possible to adopt for the
feedback sensor:
1) Encoder and Feedback pot.
2) Encoder and toggle switches.
The standard handling in both cases consists in performing an automatic centering
at key-on. The automatic centering at key-on is used to initialize the incremental
encoder.
When a straight-ahead switch is used to initialize the encoder, the steered wheel
rotates automatically until an edge is detected on the straight ahead switch.
When a Feedback pot is used to initialize the encoder, the steered wheel rotates
automatically until the potentiometer reaches the straight-ahead position.
On request, it is possible to avoid the automatic centering at key-on. In case of
feedback pot, the feedback encoder counting will be initialized at key-on with the
angle measured on the feedback pot; in case of the toggle switches, the truck speed
will be limited until the driver rotates the steered wheel and an edge on the straight
ahead switch is detected.
Several feedback sensors and command sensor combinations are not described
below. That is because they are not handled yet.
10.1 Twin Pot with Encoder and Feedback pot: one shot installation
procedure
This procedure is relative to the connecting drawings Figure 6-3. It describes the
step by step installation procedure to get the prototype working in manual mode: to
raise the AUTC function it is necessary to make the complete set-up procedure (see
topic 11).
For every truck released on the field, the default set-up shall reply the prototype
settings and so no installation procedure is required except for the acquisition of the
limiting position (see the quick set-up 11.2).
Carry out the procedure in the following order.
Step1 Connect the AC motor phases in such a way the phase references U, V, W
on the steering motor correspond to the terminals references (U, V, W) on
the eps-ac0.
Step2 In the SET MODEL menu set the SYSTEM CONFIG setting to LEVEL 1 to
steer in closed loop with a twin pot in manual mode (RTC). Turn off and on
the key in order the setting is acquired.
Step3 Set the FEEDBACK DEVICE to OPTION #1 to specify your feedback
solution is the sole FEEDBACK POT. Switch off the key after the change. (It
is necessary to start with the sole feedback pot to avoid a POSITION
ERROR due to the unknown scaling between the encoder counting and the
feedback pot value before of an encoder learning operation - Step 9 and 11
below).
Step4 Set option ENCODER CONTROL to OFF.
Step5 Connect the feedback pot in such a way the FEEDBACK POT reading in the
tester menu assumes higher voltage when the FREQUENCY in the tester
menu is positive. When a FB POT LOCKED alarm occurs immediately after
switching on the key, it means the motor is turning away from the wished
position (i.e. FEEDBACK POT decreases when the FREQUENCY is
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