3
GND
resolver SIN
IN
4
COS
resolver COS
IN
5
GND
resolver COS
IN
6
REF
drive signal to resolver
OUT
7
GND
drive signal to resolver
OUT
8
GND
The ACU resolver interface is designed for resolvers with an impedance of 100 Ohms or more
and transfer factor 0.5. The interface applies 4Veff / 2000Hz to the resolver drive coil. It expects
2Veff at the sine / cosine inputs at the maximum positions.
When connecting a resolver to the ACU, please consider the following:
Use a shielded, twisted pair cable.
Connect the cable shield either to pin 1/8 at the ACU or to the ground at the resolver
housing. Never connect the shield at both ends, this will introduce a ground loop and cause
a significant degradation of the resolver's accuracy.
CON18, CON19, CON20 SSI Positional Encoder Interface
Below the pinout of a SSI type positional encoder interface board is shown. The ACU is available
with resolver, SSI or analog position sensor interfaces. You have to select type of interface when
you order the ACU.
The SSI positional encoder may be powered from the ACU internal power supply. +5V and +24V
clamps are provided at the connector. To avoid ground loops, the cable shield should be
connected either to pin 1 at the ACU or to the ground at the encoder housing, never at both
ends.
pin
signal
description
type
1
GND
2
SSI-Data+
SSI data
IN
3
SSI-Data-
SSI data
IN
4
SSI CLK+
SSI clock
OUT
5
SSI CLK-
SSI clock
OUT
6
(C) 2022, SatService GmbH
www.satnms.com
ACU-ODM-UM-2209 Page 20/73
