3.2 Electrical Installation
3.2.1 EMC Precautions
The following EMC precautions are recommended to
achieve interference-free operation of fieldbus cable(s) and
digital and analog inputs and outputs.
Observe relevant national and local regulations, for
example regarding protective earth connection. Keep the
fieldbus cable(s) away from motor and brake resistor
cables to avoid coupling of high frequency noise from one
cable to another. Normally, a distance of 200 mm (8
inches) is sufficient, but keeping the greatest possible
distance between the cables is recommended, especially
where cables run in parallel over long distances. When
crossing is unavoidable, the fieldbus cable(s) must cross
motor and brake resistor cables at an angle of 90°, see
Illustration 3.15.
Fieldbus cable
Min. 200 mm
90° crossing
Brake resistor
Illustration 3.15 Cable Routing
3.2.2
Cable Connection
NOTICE
To comply with EMC emission specifications, screened/
armoured cables are recommended.
NOTICE
Cables General: All cabling must comply with national
and local regulations on cable cross-sections and
ambient temperature.
See Table 3.3 for recommended temperature ratings for all
cables and conductors connected to the brake resistor as
ground connection, thermal switch and brake power.
IP class Recommended cables
IP20
≥80 °C
IP21
≥80 °C
IP54
≥90 °C
1)
IP65
≥90 °C
Table 3.3 Cable Temperature Ratings
1) For ground connection
How to connect more than one resistor
Star parallel connection to ensure load is shared evenly
between 2 or more resistors.
Illustration 3.16 Connection of Several Brake Resistors
Installation Design Guide
12 Danfoss A/S © Rev. 05/2014 All rights reserved. MG90O202
33
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