Control Cables; Detecting And Eliminating Emc Interferences - Lenze 8400 motec Hardware Manual

Installation according to EMC (installation of a CE-typical drive system)

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:
ƒ
Protective measures:
ƒ
5.4.3

Control cables

Control cables must be shielded to minimise interference injections.
ƒ
Connect the shield correctly:
ƒ
– 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
ƒ
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
5.4.4

Detecting and eliminating EMC interferences

Fault
Interferences of analog
setpoints of your own or
other devices and
measuring systems
EDS84DG752 EN 5.0
Personnel in the vicinity of the motor can be injured.
Install motor cable in a protected way (e.g. in a cable duct).
Shielding of long, analog control cables
Cause
Unshielded motor cable
Shield contact is not extensive enough
Shield of the motor cable is interrupted
by terminal strips, switched, etc.
Install additional unshielded cables
inside the motor cable (e.g. for motor
temperature monitoring)
Too long and unshielded cable ends of
the motor cable

Installation
Control cables
Remedy
Use shielded motor cable
Carry out optimal shielding as specified
Separate components from other

component part with a minimum
distance of 100 mm
Use motor choke/motor filter

Install and shield additional cables
separately
Shorten unshielded cable ends to
maximally 40 mm
5
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