AMCI NEXUS NX2A4E2, User Manual

Page: 40 / 76

I
NSTALLING THE
NX2A4E2
NX2A4E2 User Manual
ADVANCED MICRO CONTROLS INC.
40
1.9 Transducer Wiring (continued)
1.9.3 AMCI Dual Resolver Multi-turn Transducers
The following diagram shows how to wire a dual resolver multi-turn transducer into the Transducer Input
Connectors of the NX2A4E2.
Figure T1.11 AMCI CML Cable Wiring
1) There are two ways to reverse the count direction when using a dual resolver transducer.
One method is to set the Count Direction parameter when programming the NX2A4E2. The
other method is to reverse connections on two of the stator pairs. These two pairs are the
CS2-CS4 pair, which is the green/black pair, and the FS2-FS4 pair, which is the blue/black
pair. The green CS4 wire goes into the CS2 terminal of the NX2A4E2 while the black CS2
wire goes into the CS4 terminal. The blue FS4 wire goes into the FS2 terminal of the
NX2A4E2 while the black FS2 wire goes into the FS4 terminal.
2) The cable shields must be isolated from earth ground at the transducer to prevent ground
loops and ground shifts. If using a junction box, treat the cable shields as a signal carrying
conductor at the junction. Do not tie the shields to earth ground at the junction box.
1.9.4 Foreign Dual Resolver Transducers
Trial and error may be involved when connecting a foreign dual resolver transducer to an NX2A4E2 module
for the first time. This is because the resolvers must appear to be rotating in the same direction before the
NX2A4E2 can decode the multi-turn position correctly. The direction of rotation of the coarse resolver
depends on the number of gear train stages between this resolver and the input shaft. Because of this, part of
the commissioning procedure when using a foreign dual resolver transducer is to verify the direction of rota-
tion of both resolvers and changing wire connections as needed. It is possible to temporarily program the
NX2A4E2 as a two channel single turn module. This allows you to see the position of the two resolvers inde-
pendently so you can verify rotation direction.
1) When using a foreign dual resolver multi-turn transducer, note how the signals are paired in
the AMCI CML cable and use this pairing when generating your wiring diagrams.
2) The cable shields must be isolated from earth ground at the transducer to prevent ground
loops and ground shifts. When using a foreign transducer, do not attach the shields to a
transducer pin, even if this follows the standard of your transducer’s manufacturer.
CML-(x) CABLE
BELDEN 9731 Cable or exact equ.
Transducer
Connector
AMCI Part #: MS-20
Bendix #:
MS3106A20-27S
CS4
FS1
FS4
CS3
CS1, CS2, FS2, FS3
Shields
CR2, FR2
CR1, FR1
Module Connector
AMCI Part #: MS-8
Phoenix #: MSTB 2.5/8-ST-5.08
17 57 07 7
F
L
J
RED
BLK
BRN
BLK
SHIELDS
YEL
BLK
BLU
BLK
WHT
BLK
GRN
BLK