AEMZP0BA - EPS-AC0 - User Manual Page - 25/95
7 CONNECTIONS: SUGGESTIONS AND
CAUTIONS
Read the following suggestions to get a correct connection of the steering
equipment.
7.1 Stepper Motor connections
The stepper motor has 4 connections: two are the stepper motor channels (CNA#9
and CNA#8) and two are the common (negative) references (CNA#10 and
CNA#11). In the past we had 6 wires connected between stepper motor and eps-ac.
We consider this 4-wire connection fulfils the norm because it is still possible to
detect all of the single stepper motor electrical fault.
4 Note: The stepper motor should be connected with two distinct common (negative)
references (CNA#10 and CNA#11). We advice against using just one
common wire. That is because it takes long delay to detect when a single
common wire is broken.
7.2 Twin pot connections
The twin pot is connected, in alternative to the stepper motor, between CNB#5
(PPOC: 5 V positive supply), CNA#10 (negative supply), CNA#9 (CPOC1: 1
st
wiper),
CNA#8 (CPOC2: 2
nd
wiper). CNB#5 is connected to a 5 Vdc supply source through
a 22 ohms resistance. Take care the supply current of the Twin pot stays lower than
5 mA.
7.3 Encoder connections
The encoder may be supplied either with 5 Vdc or 13 Vdc (factory set jumper J8) on
CNB#4 (default set is 5 Vdc on CNB#4). A 10 ohms resistance is connected
between the internal supply source and the pin CNB#4. The encoder outputs may
be either open collector NPN type or Push-Pull type.
7.4 Feedback pot connections
When a feedback pot is adopted it will be connected between CNB#2 (PPOT:
positive supply), CNB#1(NPOT: negative supply), CNB#6 (CPOT: wiper).
Pay attention, inside the eps-ac0, a 470 ohms resistance is connected between
PPOT and 5 V supply and also between NPOT and the minus battery. That is done
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