Emc Precautions; Network Connection - Danfoss VLT DriveMotor FCP 106 Programming Manual

RS-485 Installation and Set...

3.1.2 EMC Precautions

To achieve interference-free operation of the RS-485
network, Danfoss recommends the following EMC
precautions.
NOTICE
Observe relevant national and local regulations, for
example regarding protective earth connection. To avoid
coupling of high-frequency noise between the cables,
the RS-485 communication cable must be kept away
from motor and brake resistor cables. Normally, a
distance of 200 mm (8 inches) is sufficient. Maintain the
greatest possible distance between the cables, especially
where cables run in parallel over long distances. When
crossing is unavoidable, the RS-485 cable must cross
motor and brake resistor cables at an angle of 90°.
1
2
90°
1 Fieldbus cable
2 Minimum 200 mm distance
Illustration 3.2 Minimum Distance between Communication
and Power Cables
®
VLT DriveMotor FCP 106 and FCM 106 Programming Guide

3.1.3 Network Connection

Connect the frequency converter to the RS-485 network
as follows (see also Illustration 3.3):
1.
2.
3.
NOTICE
Screened, twisted-pair cables are recommended to
reduce noise between conductors.
COMM. GND Communication ground
P
N
Illustration 3.3 Network Connection
4.
MG03N102 - Rev. 2013-12-02
Connect signal wires to terminal 68 (P+) and
terminal 69 (N-) on the main control board of the
frequency converter.
Connect the cable screen to the cable clamps.
Terminal 61 is normally not used. However when
there is a large potential difference between
frequency converters, connect the screen of the
RS-485 cable to terminal 61. Terminal 61 has an
RC filter to eliminate current noise on the cable.
61 68 69
(P+) Positive
(N-) Negative
Set the control card DIP switch to ON to
terminate the RS-485 bus, and activate RS-485.
For position of DIP switch, see Illustration 3.4. The
factory setting for the DIP switch is OFF.
3 3
17