Danfoss vlt FC 102 Installation Guide

5.12.2 Grounding of Shielded Control Cables
Correct shielding
The preferred method usually is to secure control and
serial communication cables with shielding clamps
provided at both ends to ensure best possible high
frequency cable contact. If the ground potential between
the frequency converter and the PLC is dierent, electric
noise can occur that disturbs the entire system. Solve this
problem by tting an equalizing cable next to the control
cable. Minimum cable cross-section: 16 mm
2
(4 AWG).
1
2
PE
FC
PE
PLC
130BB922.12
PE PE
<10 mm
1
Minimum 16 mm
2
(4 AWG)
2 Equalizing cable
Illustration 5.15 Correct Shielding
50/60 Hz ground loops
With long control cables, ground loops can occur. To
eliminate ground loops, connect 1 end of the shield-to-
ground with a 100 nF capacitor (keeping leads short).
100nF
FC
PE
PE
PLC
<10 mm
130BB609.12
Illustration 5.16 Avoiding Ground Loops
Avoid EMC noise on serial communication
This terminal is connected to ground via an internal RC
link. To reduce interference between conductors, use
twisted-pair cables.
PE
FC
PE
FC
130BB923.12
PE PE
69
68
61
69
68
61
1
2
<10 mm
1
Minimum 16 mm
2
(4 AWG)
2 Equalizing cable
Illustration 5.17 Recommended Method for Avoiding EMC
Noise
Alternatively, the connection to terminal 61 can be
omitted:
PE
FC
PE
FC
130BB924.12
PE PE
69
69
68
68
1
2
<10 mm
1
Minimum 16 mm
2
(4 AWG)
2 Equalizing cable
Illustration 5.18 Shielding without Using Terminal 61
Electrical Installation
VLT
®
Parallel Drive Modules
40 Danfoss A/S © 08/2017 All rights reserved. MG37K302
55

Danfoss vlt FC 102 Specifications

General

Brand	Danfoss
Model	vlt FC 102
Category	DC Drives
Language	English