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Affinity User Guide
87
Issue Number: 5 www.controltechniques.com
As a general rule, if the circuits are to pass outside the building where
the drive is located, or if cable runs within a building exceed 30m, some
additional precautions are advisable. One of the following techniques
should be used:
1. Galvanic isolation, i.e. do not connect the control 0V terminal to
ground. Avoid loops in the control wiring, i.e. ensure every control
wire is accompanied by its return (0V) wire.
2. Shielded cable with additional power ground bonding. The cable
shield may be connected to ground at both ends, but in addition the
ground conductors at both ends of the cable must be bonded
together by a power ground cable (equipotential bonding cable) with
cross-sectional area of at least 10mm
2
, or 10 times the area of the
signal cable shield, or to suit the electrical safety requirements of the
plant. This ensures that fault or surge current passes mainly through
the ground cable and not in the signal cable shield. If the building or
plant has a well-designed common bonded network this precaution
is not necessary.
3. Additional over-voltage suppression - for the analog and digital
inputs and outputs, a zener diode network or a commercially
available surge suppressor may be connected in parallel with the
input circuit as shown in Figure 4-33 and Figure 4-34.
If a digital port experiences a severe surge its protective trip may operate
(O.Ld1 trip code 26). For continued operation after such an event, the
trip can be reset automatically by setting Pr
10.34
to 5.
Figure 4-33 Surge suppression for digital and unipolar inputs and
outputs
Figure 4-34 Surge suppression for analog and bipolar inputs and
outputs
Surge suppression devices are available as rail-mounting modules, e.g.
from Phoenix Contact:
Unipolar TT-UKK5-D/24 DC
Bipolar TT-UKK5-D/24 AC
These devices are not suitable for encoder signals or fast digital data
networks because the capacitance of the diodes adversely affects the
signal. Most encoders have galvanic isolation of the signal circuit from
the motor frame, in which case no precautions are required. For data
networks, follow the specific recommendations for the particular
network.
4.11.7 EMC wiring for E12/E54 and E12/E66 drives
Size 1-2
The gland plates have pre-prepared holes installed with grommets for
power and motor connection. The cable should pass through these and
the shield connected to ground using the supplied grounding clamp (see
section 4.11.1
). Alternatively the grommets can be
replaced with EMC glands.
Size 3-6
Custom holes have to be drilled for the power and motor cables. Suitable
glands should be installed to the gland plate, the cable passed through
the glands and the cable shield connected to ground inside the drive.
Alternatively EMC glands can be used.
If EMC glands are used they should rated to the required IP rating and
installed in accordance with the supplier's recommendations.
4.12 PC communications connections
4.12.1 Communications port
The drive has a serial communications port (serial port) as standard
supporting 2 wire EIA485 communications. Please see Table 4-16 for
the connection details for the RJ45 connector.
Figure 4-35 Location of the RJ45 serial comms connector
Table 4-16 Connection details for RJ45 connector
The communications port applies a 2 unit load to the communications
network.
Minimum number of connections are 2, 3, 7 and shield. Shielded cable
must be used at all times.
Signal from plant
Signal to drive
0V
0V
30V zener diode
e.g. 2xBZW50-15
Signal from plant
Signal to drive
0V
0V
2 x 15V zener diode
e.g. 2xBZW50-15
Pin
Function
1
120
Ω
Termination resistor
2
RX TX
3
Isolated 0V
4
+24V (100mA)
5
Isolated 0V
6
TX enable
7
RX\ TX\
8
RX\ TX\ (if termination resistors are required, link to pin 1)
Shell
Isolated 0V
NOTE
1
8
Содержание Affinity
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