28
CHAPTER 4 – Connections
SMT-BD2/m
1.3
-
RS-232
SERIAL LINK CONNECTION
2 - WIRING (according to CEI 801 and EN 55011 standards)
2.1
-
GND
WIRING AND GROUNDING
The reference potential is the
earth (ground)
. Motors and sensors (e HES) are grounded via their
housing. If a potential reference is existing, like a main chassis or a cabinet, with a low impedance between its
various elements, it should be used to connect ALL references to it and also connect this reference to the earth
(ground).
Long reference potential connections are suitable
ONLY
if these connections have an impedance < 0,1
Ω
. Cables
with low potential should
NEVER
run in the proximity of power lines.
Each conductor cable
(carrying a potential)
must be
shielded
. Several wires in the
same sleeve
must be
twisted
and
shielded
.
According to the
CEI 801 standard
, the connectors must be metallic or metal plated and must have
a 360° shield
connection
.
2.2
-
M
OTOR AND SENSORS CABLES
Cable ends should have a metallic collar allowing a 360° shield connection.
Motor cables must be shielded to avoid common mode effects.
Encoder and HES cable must also be shielded.
2.3
-
A
NALOG INPUTS AND SERIAL LINK CABLES
The analog input signals requires a pair twisted and shielded cable. The shield must have a "360°" connection via
metallic collars at both ends. If the shield is connected by means of a wire thread, it must be connected at one end
to a 0 Volt pin of X4 on the amplifier side with a connection as short as possible. For the 0 Volt, X4-15 and X4-16
pins must be connected together on the X4 connector.
The serial link cable must also be shielded according to the above mentioned shielding recommendations.
SMT-BD2
X5
PC
SERIAL PORT
360° shield connection
Sub D 9 pts female
Sub D 9 pts female
RxD 2
TxD 3
GND 5
5 GND
2 RxD
3 TxD
