Installation manual

ManualsBrandsDanaher Motion ManualsComputer equipmentServostar M-SS-005-03

Wiring 08/04 Danaher Motion Kollmorgen

36 M-SS-001-01 Rev. T SERVOSTAR S Installation

4.9.3 DIGITAL ENCODER

The SERVOSTAR can use encoder feedback to monitor the motor

shaft position. As opposed to a resolver, which is an absolute

position feedback device, the encoder is an incremental device that

indicates changes in position. The encoder resolution of the

SERVO

STAR (and therefore the drive’s encoder equivalent output)

is fixed because it is a hardware characteristic of the encoder

device. The encoder interface includes three groups of wires:

1. A/B (and complement) lines make up the encoder quadrature

signals. The signals are received differentially through line

receivers before being passed through a wire-break detection

circuit.

2. The narrow Index pulse normally appears once per revolution

and indicates a known physical position of the shaft. This pulse

is received differentially through a line receiver before being

passed through a wire-break detection circuit. This signal is

hardware capturable.

3. Hall signals provide information representing the approximate

absolute location of the motor shaft. From this information, the

motor can sinusoidally commutate forward until the index

signal is detected. at which time the true position is known.

These signals are isolated by an opto-coupler and can be

differential or open-collector type signals.

4.9.3.1. Specifications

Encoder Requirements

Required Signals

Types: A, B with or without Index pulse

A, B, Index with or without Hall Channels

* Halls may be integral or discrete

Signal Type: A-quad-B and Marker

Halls

Differential: do not connect single-ended

Differential or Open Collector

System Voltage 5 VDC

Maximum Input Frequency

From encoder: 3 MHz (before quad), 12 MHz

(after quad)

Maximum Cable Length

System Dependent: 50 ft. (15 m)

Recommended

Maximum Line Count Per Motor

Electrical Cycle

10,000,000

Maximum Supply Current from

SERVOSTAR

250 mA

Protection

Separate Voltage Regulator, Broken wire

detector for A, B, Index, and Hall channels,

Illegal Hall Code Detection