Danfoss VLT AutomationDrive FC 360 Programming Guide

Programming Guide | VLT® AutomationDrive FC 360
4.13.2 14-1* Mains On/Off
Parameters for configuring mains failure monitoring and handling. If a mains failure appears, the drive tries to continue in a controlled
way until the power in the DC link is exhausted.
14-10 Mains Failure
Default value: [0] No function Parameter type: Option
Setup: All setups Conversion index: –
Data type: Uint8 Change during operation: True
Parameter 14-10 Mains Failure is typically used where short mains interruptions (voltage dips) are present. At 100% load and a short
voltage interruption, the DC voltage on the main capacitors drops quickly. For larger drives, it only takes a few milliseconds before the DC
level is down to about 373 V DC and the IGBTs cut off and lose control of the motor. When mains is restored and the IGBTs start again, the
output frequency and voltage vector do not correspond to the speed/frequency of the motor, and the result is normally an overvoltage
or overcurrent, mostly resulting in a trip lock. Parameter 14-10 Mains Failure can be programmed to avoid this situation. Select the
function to which the drive must act when the threshold in parameter 14-11 Mains Fault Voltage Level has been reached.
Option Name Description
[0] No function The drive does not compensate for a
mains interruption. The voltage on the DC
link drops quickly and the motor is lost
within milliseconds to seconds. Trip lock is
the result.
[1] Ctrl. ramp-down The drive retains control of the motor
and does a controlled ramp down from
parameter 14-11 Mains Fault Voltage
Level. If parameter 2-10 Brake Function is
[0] Off or [2] AC brake, the ramp follows
the overvoltage ramping. If parameter
2-10 Brake Function is [1] Resistor Brake,
the ramp follows the setting in parameter
3-81 Quick Stop Ramp Time. This selection
is useful in pump applications, where
the inertia is low and the friction is high.
When mains is restored, the output
frequency ramps the motor up to the
reference speed (if the mains interruption
is prolonged, the controlled ramp down
might take down the output frequency to
0 RPM, and when the mains is restored,
the application is ramped up from 0 RPM
to the previous reference speed via the
normal ramp up). If the energy in the
DC link disappears before the motor is
ramped to 0, the motor is coasted.
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Danfoss VLT AutomationDrive FC 360 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 360
Category	DC Drives
Language	English