AF9ZP0BA - EPS-ACW REACH TRUCK - User Manual Page - 15/90
9.4 Sensor in the steering wheel
Only Open Loop mode (Speed control) is admitted, leading to the following
configuration:
1) No limit, multiturn steering wheel. It asks for a command device being a
stepper motor used as a tachogenerator.
9.4.1 Stepper motor
The stepper motor is used as a tachogenerator. The following part numbers
resulted suited to work with epsacW:
1) MINEBEA Type code AA23KM-K227-T20V.
2) JAPAN SERVO Type Code KH56JM2X 1269 DC12V 30 ohm.
They have the same mechanical dimensions (see Figure 9.4.1-1 below).
Obviously, the above information states only these parts are suited for the
epsacW; no reliability evaluation is given here.
Other sources are possible on request, but must be tested for approval.
Figure 9.4.1–1
9.5 Feedback sensors
The Feedback sensors arrangement to work in Open Loop Manual mode only
consists of:
1) Low resolution incremental encoder in the motor shaft (4pulses/rev)
2) Two Toggle switches in the straight ahead orientation (SW1 on CNA#12)
and 90 degrees orientation (SW2 on CNA#11) of the steered wheel.
On request and with a different part number, epsacW may work also in the
closed loop mode with two encoders in the motor shaft together with one (or two)
straight ahead toggle switch.
U This manual deals with above configuration (one incremental encoder in
the motor shaft together with one or two toggle switches on the steered
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