Connections: Suggestions And Cautions; Stepper Motor Connections; Twin Pot Connections; Encoder Connections - Zapi EPS-AC0 SWs&ENC User Manual

6 CONNECTIONS: SUGGESTIONS AND
CAUTIONS
Read the following suggestions to get a correct connection of the steering
equipment.

6.1 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)

6.2 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
CNA#8 (CPOC2: 2
a 22 ohms resistance. Take care the supply current of the Twin pot stays lower than
5 mA.

6.3 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 for F07115; 13Vdc on CNB#4 for F07145). 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.

6.4 General Purpose Analog Input CNB#6

CNB#6 is an analog input in the range 0 to 5Vdc. It can be used as a general
purpose input.
Pay attention, inside the eps-ac0, a 470 ohms resistance is connected between
CNB#2 (PPOT) and 5 V supply and also between CNB#1 (NPOT) and the minus
battery. That is done in order it will be possible to detect if a potentiometer
connected between CNB#2, CNB#1 and CNB#6 (see Figure 6-1 below) has a
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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.
nd
wiper). CNB#5 is connected to a 5 Vdc supply source through
AEMZP0EA - EPS-AC0 SWs&ENC - User Manual
st
wiper),