Electrical Connections - Renishaw RGH34 Installation Manual

Electrical connections

Grounding and shielding
Conductive Output
shield signals
FPC Cable
Conductive
RGH34
mounting plate
readhead
*
Maximum extension cable length
RGI34B-100 m, RGI34T, D, G and X - 50 m, RGI34N, W, Y and H - 20 m
For optimum performance, ensure 100% screening
• Ground the readhead mounting bracket
• Ensure continuity of all shields
• Use double shielded extension cable
• Connect interface CASE to ground
• Use shielded connector shells on all cable connections
• Terminate the inner shield to 0V power at the customer interface
• Maximise the distance between encoder and motor cables
RGH34 RGS40 installation guide
Double-shielded extension cable
Outer shield
Inner shield
0 V
Interface 'case'
connected to Case
ground
Recommended signal termination
Digital outputs - RGI34T, D, G, X, N, W, Y and H
*
Interface
A B Z Q+
= 120 Ω
Cable Z
0
A B Z Q-
Standard RS422A line receiver circuitry
Capacitors recommended for improved noise immunity.
Analogue output - RGI34B
V V V +
0 1 2
120 Ω
V V V -
0 1 2
Remote LED driver outputs
The remote LED driver output allows remote monitoring of readhead installation.
150 Ω
Green
+
Green
Red
–
0 V
Customer
220 pF
electronics
120 Ω
220 pF
0 V
Red/Green
LED
Red
10