1
8902/EQ HTTL Speed Feedback Option
HTTL
S
PEED
F
EEDBACK
O
PTION
Description
The HTTL Speed Feedback Option allows incremental encoders to be connected directly to the
motor controller to provide highly accurate speed feedback measurement.
Features
The option has the following features:
•
Contains three optically isolated differential inputs on channels A, B and M
•
Decoding logic to interface the encoder to the microprocessor
•
Supplies variable voltage, isolated encoder power supply
Part Number
The part number for the HTTL Speed Feedback Option is:
8902-EQ-00-00
8902-EQ-00-FF (indicates a factory-fitted option)
Used On
This option can be used on 890 drives with the following Product Codes:
890SD-..
890SD Standalone Drive
890CD-.. 890CD Common Bus Drive
Refer to the 890 Engineering Reference Manual, Appendix E for Product Code details.
Specifications
Maximum Pulse Rate
250kHz (differential)
200kHz (single-ended)
Receiver Current
≤
10mA per channel
Input Format
Two differential channels in quadrature,
clock/dir or clock only
Input Voltage Range
±30V (differential)
0-30V (single-ended)
Input Voltage Threshold
3V ± 1V (differential)
8V ± 1V (single-endedl)
Encoder Supply
Maximum load = 200mA or 2W, whichever
is smaller. Voltage adjustable 10-20V by
firmware
Terminal Wire Size (maximum)
16 AWG
Terminal Tightening Torque
0.22 - 0.25Nm (1.9 - 2.2 pound-inches)
Recommended Spare Parts
We recommend that you keep one option as a spare to reduce down-time.
