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Parameter 14-06 Dead Time Compensation
Table 479: Parameter 14-06 Dead Time Compensation
14-06 Dead Time Compensation
Default Value: [1] On
Parameter Type: Option
Setup: All set-ups
Conversion Index: -
Data Type: Uint8
Change during operation: True
Option
Name
Description
[0]
Off
No compensation.
[1]*
On
Activates dead-time compensation.
4.14.2 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 control-
led way until the power in the DC link is exhausted.
Parameter 14-10 Mains Failure
Table 480: Parameter 14-10 Mains Failure
14-10 Mains Failure
Default Value: [0] No function
Parameter Type: Option
Setup: All set-ups
Conversion Index: -
Data Type: Uint8
Change during operation: True
When
parameter 1-00 Configuration Mode
is set to
[2] Torque
, the following options are inactive:
[1] Ctrl. ramp-down
[2] Ctrl. ramp-down, trip
[5] Kinetic back-up, trip
[7] Kin. back-up, trip w recovery
N O T I C E
This parameter cannot be changed while the motor is running.
Parameter 14-10 Mains Failure
is typically used where very 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 drops to about 373 V DC, and the IGBTs cut off and lose the 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 according to which the drive must act when the threshold in
parameter 14-11 Mains Fault
Voltage Level
is reached.
Op-
tion
Name
Description
[0]*
No
func-
tion
The drive does not compensate for a mains interruption. The voltage on the DC link drops quickly and motor
control is lost within milliseconds to seconds. This situation results in a trip lock.
[1]
Ctrl.
ramp-
down
Control of the motor remains with the drive, and the drive performs 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
pa-
rameter 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 may bring the output frequency down to
0 RPM, and when the mains is restored, the application is ramped up from 0 RPM to the previous reference
AU373327181955en-000101 / 130R1208
266 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
