Danfoss VLT AutomationDrive EZ FC 321 Programming Manual page 338

VLT® AutomationDrive EZ FC 321
Programming Guide
Available for PM motors only, in flux sensorless mode and VVC
Option Name Description
[0] Off
[1] On Protects the motor from the locked rotor condition. The control algorithm detects a possible locked rotor con-
dition in the motor and trips the drive to protect the motor.
Parameter 30-23 Locked Rotor Detection Time [s]
Table 709: Parameter 30-23 Locked Rotor Detection Time [s]
30-23 Locked Rotor Detection Time [s]
Default Value: Size related
Conversion Index: -2
Time period for detecting the locked rotor condition. A low parameter value leads to faster detection.
Parameter 30-24 Locked Rotor Detection Speed Error [%]
Table 710: Parameter 30-24 Locked Rotor Detection Speed Error [%]
30-24 Locked Rotor Detection Speed Error [%]
Default Value: 25%
Conversion Index: -1
Detects locked rotor condition for SPMSM at high speed.
Light-load detection
Light-load detection is a feature for lift application to ensure lift evacuation in a direction, which requires the least energy (UPS
capacity) during an emergency. When a light-load detection and start signal is received, the drive starts in the selected direction.
After the delay in seconds specified in parameter 30-26 Delay Before Measurements, the drive integrates the current consumption
within the time defined in parameter 30-25 Measurement Duration. After completing current integration for 1 direction, the drive
starts in the other direction and repeats the current integration. On comparing the 2 integrated currents, the lift evacuates in the
direction which requires the least current.
Parameter 30-25 Measurement Duration
Table 711: Parameter 30-25 Measurement Duration
30-25 Measurement Duration
Default Value: 0.000 s
Conversion Index: -3
Duration of current integration measurement. The measurement is done in both directions. The direction with the lowest measure-
ment value is selected by the drive.
Parameter 30-26 Delay Before Measurements
Table 712: Parameter 30-26 Delay Before Measurements
30-26 Delay Before Measurements
Default Value: 0.000 s
Conversion Index: 0
Delay before current measurement. Allows to avoid mismatch in measurements caused by mechanical friction during opening of
mechanical brakes.
338 | Danfoss A/S © 2021.08
Parameter Type: Range, 0.05 - 1 s
Data Type: Uint8
Parameter Type: Range, 0 - 100%
Data Type: Uint32
Parameter Type: Range, 0.000 - 10.000 s
Data Type: Uint32
Parameter Type: Range, 0.000 - 10.000 s
Data Type: Uint16
+
open-loop mode.
Setup: All set-ups
Change during operation: True
Setup: All set-ups
Change during operation: True
Setup: All set-ups
Change during operation: True
Setup: All set-ups
Change during operation: True
Parameter Descriptions
AU373327181955en-000101 / 130R1208