Protection and Features:
• Electronic thermal motor protection against overload.
• Temperature monitoring of the heatsink ensures that the adjustable frequency drive trips
if the temperature reaches 203° F ± 9° F [95° C ± 5° C]. An overload temperature cannot
be reset until the temperature of the heatsink is below 158° C ± 9° C [70° C ± 5° C]
(Guideline - these temperatures may vary for different power sizes, enclosures, etc.).
VLT HVAC drive has an auto-derating function to prevent it's heatsink from reaching 203°
F [95° C].
• The adjustable frequency drive is protected against short-circuits on motor terminals U,
V, W.
• If a line phase is missing, the adjustable frequency drive trips or issues a warning (de-
pending on the load).
• Monitoring of the intermediate circuit voltage ensures that the adjustable frequency drive
trips if the intermediate circuit voltage is too low or too high.
• The adjustable frequency drive is protected against ground faults on motor terminals U,
V, W.
5. General Specifications
VLT
®
HVAC DRIVE High Power
Instruction Manual
124
MG.11.F1.22 - VLT
®
is a registered Danfoss trademark.
5
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