Danfoss VLT Automation VT Drive FC 322 Programming Manual page 161

VLT Automation VT Drive FC322
Programming Guide
Illustration 2.3: Controlled Ramp-down, longer mains failure. Ramping down as long as the energy in the system allows for it, then the motor
is coasted.
Illustration 2.4: Kinetic Back-up, short mains failure. Ride through as long as the energy in the system allows for it.
Illustration 2.5: Kinetic Back-up, longer mains failure. The motor is coasted as soon as the energy in the system is too low.
14-11 Mains Voltage at Mains Fault
Range:
Application [180 - 600 V]
dependent*
14-12 Function at Mains Imbalance
Option:
[0] * Trip
[1] Warning
[2] Disabled
[3] * Derate
2.13.4 14-2* Trip Reset
Parameters for configuring auto reset handling, special trip handling and control card self test or initialisation.
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Function:
This parameter defines the threshold voltage at which the selected function in par. 14-10
Failure
should be activated.
Function:
Operation under severe main imbalance conditions reduces the lifetime of the motor. Conditions are
considered severe if the motor is operated continuously near nominal load (e.g. a pump or fan
running near full speed).
When a severe mains imbalance is detected:
Select Trip [0] to trip the frequency converter.
Select Warning [1] to issue a warning.
Select Disabled [2] for no action.
Derate
Select [3] for derating the frequency converter.
MG.20.W1.22 - VLT is a registered Danfoss trademark
2 Parameter Description
2
Mains
159