Danfoss VLT HVAC Design Guide

Variable speed pump (lead) Fixed speed pumps
Hand On Ramps up (if stopped by a normal stop com-
mand) or stays in operation if already running
Destaging (if running)
Off Ramps down Ramps down
Auto On Starts and stops according to commands via ter-
minals or serial bus
Staging/Destaging
VLT
®
HVAC Drive Design Guide 6 Application Examples
MG.11.B9.02 - VLT
®
is a registered Danfoss trademark 127
6

Danfoss VLT HVAC Specifications

General

Enclosure Rating	IP20, IP21, IP54, IP55, IP66
Storage Temperature Range	-25°C to +70°C
Output Voltage Range	0-100% of supply voltage
Communication Protocols	Modbus RTU, BACnet, Ethernet/IP, Profibus DP
Ambient Temperature Range	-10°C to +50°C (without derating)
Relative Humidity	5% to 95% non-condensing
Altitude	Up to 1000 m without derating
Cooling Method	Air cooled
Application	HVAC systems, Pumps, Fans, Compressors
Voltage Range	200-240 V, 380-500 V, 525-600 V
Frequency Range	0 Hz to 590 Hz