Danfoss VLT HVAC Drive User Manual

4.1.19. Electrical Installation and Control Cables
Illustration 4.28: Diagram showing all electrical terminals. (Terminal 37 present for units with Safe Stop
function only.)
Very long control cables and analog signals may, in rare cases and depending on the installation,
result in 50/60 Hz ground loops due to noise from line supply cables.
If this occurs, break the shield or insert a 100 nF capacitor between shield and chassis.
NOTE
The common of digital / analog inputs and outputs should be connected to separate
common terminals 20, 39, and 55. This will prevent ground current interference
among groups. For example, it prevents switching on digital inputs from disturbing
analog inputs.
NOTE
Control cables must be shielded/armored.
VLT
®
HVAC Drive Instruction Manual 4. Electrical installation
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark 45
4

Danfoss VLT HVAC Drive Specifications

General

Type	VLT HVAC Drive
STO (Safe Torque Off)	Yes
Enclosure	IP20
Output Frequency	0-500 Hz
Brake Chopper	Built-in (depending on frame size)
EMC Filter	Built-in (depending on frame size)
Communication	Ethernet
Power Range	0.37 kW to 630 kW
Input Voltage	200-240V, 380-480V, 525-600V
Protection Features	Overload, Overvoltage, Undervoltage, Short Circuit, Ground Fault
Ambient Temperature	-10°C to +50°C (with derating above +40°C)
Storage Temperature	-25°C to +70°C
Relative Humidity	5-95% (non-condensing)
Cooling Method	Air-cooled