Danfoss VLT Programming Guide

In order to maintain PELV, all connections made to the control terminals must be PELV, e.g. thermistor must be reinforced/ double
insulated
NB!
Danfoss recommends using 24 VDC as thermistor supply voltage.
1-91 Motor External Fan
Option: Function:
[0] * No No external fan is required, i.e. the motor is derated at low speed.
[1] Yes Applies an external motor fan (external ventilation), so no derating of the motor is required at low
speed. The graph below is followed if the motor current is lower than nominal motor current (see
par. 1-24
Motor Current ). If the motor current exceeds nominal current, the operation time still
decreases as if no fan were installed.
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3 Parameter Description VLT
®
HVAC Drive Programming Guide
58 MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3

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)