Danfoss VLT HVAC Series User Manual

3.14.7 14-5* Environment
These parameters help the adjustable frequency drive to operate under special environmental conditions.
14-50 RFI 1
Option: Function:
[0] Off Select Off [0] only if the adjustable frequency drive is fed by an isolated line power source, i.e.,
from a special IT line power source.
In this mode, the internal RFI filter capacitors between chassis and the line power RFI filter circuit
are cut out to avoid damage to the intermediate circuit and to reduce the ground capacity currents
according to IEC 61800-3.
[1] * On Select
On [1] to ensure that the adjustable frequency drive complies with EMC standards.
14-52 Fan Control
Option: Function:
Select the minimum speed of the main fan.
[0] * Auto Select Auto [0] to run the fan only when the internal temperature of the adjustable frequency drive
is in the range 95°F [+35°C] to approximately 131°F [+55°C]. The fan will run at low speed at 95°F
[+35°C] and at full speed at approximately 131°F [+55°C].
[1] On 50%
[2] On 75%
[3] On 100%
14-53 Fan Monitor
Option: Function:
Select which action the adjustable frequency drive should take in case a fan fault is detected.
[0] Disabled
[1] * Warning
[2] Trip
3.14.8 14-6* Auto Derate
This group contains parameters for derating the adjustable frequency drive in case of high temperature.
14-60 Function at Overtemperature
Option: Function:
If either heatsink or control card temperature exceeds a factory-programmed temperature limit, a
warning will be activated. If the temperature increases further, select whether the adjustable fre-
quency drive should trip (trip locked) or derate the output current.
[0] * Trip The adjustable frequency drive will trip (trip locked) and generate an alarm. Power must be cycled
to reset the alarm, but will not allow restart of the motor until the heatsink temperature has dropped
below the alarm limit.
[1] Derate If the critical temperature is exceeded, the output current will be reduced until the allowable tem-
perature has been reached.
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark 3-141
3

Danfoss VLT HVAC Series Specifications

General

Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Profibus, Ethernet
Cooling Method	Forced convection
Ambient Temperature	-10°C to +40°C
Enclosure Rating	IP20, IP21, IP55
Output Voltage	0 - 100% of supply voltage