CG CDN40-012-65, Hardware Manual

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5 Installation
Installation according to EMC (installation of a CE−typica l drive system)
48 CG Drives & Automation
Special conditions allow you to integrate the supply cable for temperature monitoring of
the motor into the motor cable
5.3.3 Control cables

Control cables must be shielded to minimise interference injections.

Connect the shield correctly:
– Connect the shield of digital input and output cables at both ends.
– Connect the shield of analog input and output cables at one end (at the drive
controller).

To achieve an optimum shielding effect (in case of very long cables, with high
interference) one shield end of analog input and output cables can be connected to
PE potential via a capacitor (e.g. 10 nF/250 V) (see sketch).
Fig. 5−1 Shielding of long, analog control cables
5.3.4 Detecting and eliminating EMC interferences
Fault Cause Remedy
Interferences of analog
setpoints of your own or
other devices and
measuring systems
Unshielded motor cable Use shielded motor cable
Shield contact is not extensive enough Carry out optimal shielding as specified
Shield of the motor cable is interrupted
by terminal strips, switched, etc.
•
Separate components from other
component part with a minimum
distance of 100 mm
•
Use motor choke/motor filter
Install additional unshielded cables
inside the motor cable (e.g. for motor
temperature monitoring)
Install and shield additional cables
separately
Too long and unshielded cable ends of
the motor cable
Shorten unshielded cable ends
to maximally 40 mm

Danger!
Uncontrolled motor movements can occur
If the motor cable is damaged, a short circuit between the brake control cables
and the motor cables can cause motor movements with low torque.
Possible consequences:

Personnel in the vicinity of the motor can be injured.
Protective measures:

Install motor cable in a protected way (e.g. in a cable duct).