5
8902/EQ HTTL Speed Feedback Option
Wiring the System
WARNING!
Disconnect all sources of power before attempting installation.
Caution
This option contains ESD (Electrostatic Discharge) sensitive parts. Observe static control
precautions when handling, installing and servicing this option.
X34 Connections
For correct operation, A, /A, B and /B
must
be connected as shown. If any is left unconnected,
the HTTL speed feedback option will not operate.
The M input is not normally connected - it is for use with future versions of the drive software.
M: for connection to the once-per-revolution marker output from the encoder to
verify correct operation of the encoder.
Take special care wiring the encoders to the Option due to the low level of the signals.
Use twisted-pair, screened cable, preferably with an overall screen and a screen over each
individual pair. To ensure compliance with the EMC Directive the overall cable screen should
be connected to the encoder body and to the cable clamp.
Recommended cable:
3 pairs individually screened, plus overall screen, characteristic impedance 100 to
120
Ω
, e.g. Belden 8163
1 GND
2 -V
3 +V
4 /M
5 M
6 /B
7 B
8 /A
9 A
X34
X34
Terminal
OPTION BOARD
ENCODER
(supply)
M
A
B
+ -
A
/M
GND
/A
B /B
M
+ -
(supply)
OPTION BOARD
ENCODER
(supply)
M /M
A /A
B /B
+ -
(supply)
Single-Ended
Encoder Outputs
Differential
Encoder Outputs
1
6
9
2
3
4
5
7
8
A
/M
GND
/A
B /B
M
+ -
1
6
9
2
3
4
5
7
8
Figure 4 Wiring Diagram
