Summary
Preface
P. 6
Chapter 2
P. 17
Technical data
Chapter 5
P. 76
Reception, storage
and installation
Chapter 4
P. 54
General information
Chapter 3
P. 47
Application notes
Chapter 6
P. 115
Options
Chapter 7
P. 129
Preventive maintenance
Chapter 1
P. 15
Overview
and installation diagram
Answer Drives 1000
113
5
5.9.4.3 SIGNAL CABLES SCREENING
The cables for digital signals longer than 3 metres and all cables for
analogue signals must be screened. The screen must not be interrupted
and, normally, must be connected at both ends by metal clamps or
similar devices, placed directly on clean metal surfaces, provided that
the grounding points are part of the same ground line. Otherwise, it is
necessary to connect a capacitor (10 nF-2 KV) to the ground line on one
end. In the rare cases in which the current flowing in the screen interferes
with the signals to be screened, the screen must be connected only on the
drive side.
In the drive cabinet, it is necessary to make this type of connection directly
on the sheet near the terminals and if the cable comes from outside, also
on the PE bus bar; at the other end of the cable, the screen must be firmly
connected to the housing of the transmitting or receiving unit. When
grounding screened cables, use a 360° connection and avoid the pigtail
connection, i.e. connect the screen to ground via a cable or use the screen
rolled up and connected to ground. Use a screened twisted pair for the
analogue signals. This type of cable is recommended also for encoder
signals. Use a twisted pair for each signal.
A screened twisted pair is the best solution for low voltage digital signals
but also multi-core screened twisted pair cables can be used.
Using digital signal cables separated from the analogue signal cables.
Use twisted cables for the relay, such cables (with voltage not exceeding
48 V) can travel together with digital signals.
Do not mix 24 VDC wires and 115 / 230 VAC wires in the same cable.
Control cables maximum cross-section: 1.5mm2 (AWG16)
5.9.4.3 SIGNAL CABLES SCREENING
The control cables must be kept at a
distance greater than 0.3 m (1 foot)
from the power cables.
Install the power cables and the signal
cables in separate cable-ducts.
If it is necessary to cross the power and
signal cables carry out the intersection
with a 90° angle.
AD1000
Figure 5.9.4.3.1 Cables path
Summary of Contents for AD1A008FBBNH
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