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VLT
®
HVAC Drive Programming Guide
3.14.7 14-5* Environment
These parameters help the adjustable frequency drive to operate under special environmental conditions.
14-50 RFI 1
Option:
[0]
Off
[1] *
On
14-52 Fan Control
Option:
[0] *
Auto
[1]
On 50%
[2]
On 75%
[3]
On 100%
14-53 Fan Monitor
Option:
[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:
[0] *
Trip
[1]
Derate
Function:
Off
Select
[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.
On
Select
[1] to ensure that the adjustable frequency drive complies with EMC standards.
Function:
Select the minimum speed of the main fan.
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].
Function:
Select which action the adjustable frequency drive should take in case a fan fault is detected.
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.
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.
If the critical temperature is exceeded, the output current will be reduced until the allowable tem-
perature has been reached.
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3 Parameter Description
3
3-141
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