Danfoss VLT FC 100 Operating Instructions

Very long control cables and analogue signals may in rare
cases and depending on installation result in 50/60 Hz
earth loops due to noise from mains supply cables.
If this occurs, it may be necessary to break the screen or
insert a 100 nF capacitor between screen and chassis.
The digital and analog inputs and outputs must be
connected separately to the frequency converter common
inputs (terminal 20, 55, 39) to avoid earth currents from
both groups to affect other groups. For example, switching
on the digital input may disturb the analog input signal.
Input polarity of control terminals
12 13 18 19 27 29 32 33 20 37
+24 VDC
0 VDC
130BT106.10
PNP (Source)
Digital input wiring
NPN (Sink)
Digital input wiring
12 13 18 19 27 29 32 33 20 37
+24 VDC
0 VDC
130BT107.11
NOTE
Control cables must be screened/armoured.
130BT340.10
Connect the wires as described in the VLT ® Automa-
tionDrive FC 300 Operating Instructions, MG33AXYY.
Remember to connect the shields in a proper way to
ensure optimum electrical immunity.
How to Install
VLT
®
Automation Drive FC 300 12-Pulse
Operating Instructions High Power
MG34Q202 - VLT
®
is a registered Danfoss trademark 51
3
3

Danfoss VLT FC 100 Specifications

General

Brand	Danfoss
Model	VLT FC 100
Category	DC Drives
Language	English