Danfoss VLT Design Guide

5.2.12 Electrical Installation, Control Cables
Illustration 5.23 Diagram Showing all Electrical Terminals.
Very long control cables and analog 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, you may have to break the screen or insert a
100 nF capacitor between screen and chassis.
The digital and analog in- and outputs must be connected
separately to the frequency converter common inputs
(terminal 20, 55, 39) to avoid ground currents from both
groups to affect other groups. For example, switching on
the digital input may disturb the analog input signal.
NOTE
Control cables must be screened/armoured.
How to Install
VLT
®
Refrigeration Drive Design Guide
70 MG16G102 - VLT
®
is a registered Danfoss trademark
5
5

Danfoss VLT Specifications

General

Frequency	50/60 Hz
Enclosure	IP20, IP21, IP55, IP66
Series	VLT
Control Technique	Flux Vector Control
Output Voltage	0-Vinput
Control Method	Fieldbus
Communication Interface	PROFIBUS, CANopen
Protection Features	Overload, Overvoltage, Undervoltage, Short Circuit, Ground Fault
Cooling Method	Liquid Cooled
Storage Temperature	-25°C to +70°C
Relative Humidity	5-95% non-condensing
Altitude	Up to 1000m (3280ft) without derating, up to 4000m (13120ft) with derating
Operating Temperature	-10°C to +50°C (14°F to 122°F)