Electrical Connections - Renishaw RGH40 Installation Manual

Electrical connections

Grounding and shielding
RGH40
Inner shield
Outer shield
*
Contact Renishaw for information about using extension cables.
IMPORTANT: The outer shield should be connected to the machine earth (Field Ground). The inner shield should be connected
to 0 V at receiving electronics only. Care should be taken to ensure that the inner and outer shields are insulated from each
other. If the inner and outer shields are connected together, this will cause a short between 0 V and earth, which could cause
electrical noise issues.
Recommended signal termination
Digital outputs – RGH40T, D, G, X, N, W, Y, H
0 V
Readhead
220 pF
A B Z+
= 120 Ω 120 Ω
Cable Z
0
A B Z-
220 pF
0 V
Standard RS422A line receiver circuitry
Capacitors recommended for improved noise immunity.
Single ended alarm signal termination
(option 05)
5 V
Readhead
4k7 Ω
electronics
1k8 Ω
100 Ω
E-
4k7 Ω
100nF
RGH40 RGS40-G
installation guide
*
Extension cable
Analogue output – RGH40A
V
Customer
electronics
Limit output
5 V to 24 V
V
Customer
†
Select R so that the maximum current
does not exceed 20 mA.
Alternatively, use a suitable relay or
opto-isolator.
Customer
electronics
5 V
Output
signals
0 V
V V +
0 1 2
120 Ω
V V V -
0 1 2
†
R
V P Q
p q
11