Danfoss VLT AutomationDrive FC 301 Programming Manual page 283

Parameter Descriptions
30-22 Locked Rotor Protection
Option: Function:
NOTICE
This parameter is available for
FC 302 only.
Available for PM motors only, in
flux sensorless mode and VVC
open-loop mode.
[0] Off
[1] On Protects the motor from the locked
rotor condition. The control
algorithm detects a possible locked
rotor condition in the motor and
trips the frequency converter to
protect the motor.
30-23 Locked Rotor Detection Time [s]
Range: Function:
Size [0.05 - 1 s] Time period for detecting the
related locked rotor condition. A low
*
parameter value leads to faster
detection.
30-24 Locked Rotor Detection Speed Error [%]
Range: Function:
NOTICE
25 % [0 - 100 %]
*
This parameter is available for
FC 302 only.
3.22.4 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 two integrated currents, the
lift evacuates in the direction which requires the least
current.
30-25 Measurement Duration
Range: Function:
0.000 s [0.000 - Duration of current integration
*
10.000 s] measurement. The measurement is
done in both directions. The
direction with the lowest
M0013101
Programming Guide
30-25 Measurement Duration
Range:
30-26 Delay Before Measurements
Range:
0.000 s
*
+
30-27 Light Load Speed [%]
Range:
0 %
*
30-28 Evacuation Speed [%]
Range:
0 %
*
30-29 Ramp Time
Range:
Size
related
*
3.22.5 30-5* Unit Configuration
Parameters in this group allow to configure the operation
of internal units that communicate with the frequency
converter. The settings affect the behavior of hardware
components inside the frequency converter.
30-50 Heat Sink Fan Mode
Option:
[0]
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Function:
measurement value is selected by
the drive.
Function:
[0.000 - Delay before current measurement.
10.000 s] Allows to avoid mismatch in
measurements caused by
mechanical friction during opening
of mechanical brakes.
Function:
[0 - 100 %] Use this parameter when the light-
load detection is active to define
the speed during current
measurement. Enter the reference
speed during the light-load
detection. The value is a percentage
of nominal motor speed in
parameter 1-25 Motor Nominal
Speed. For standard asynchronous
motors, the synchronous speed is
used instead of
parameter 1-25 Motor Nominal Speed
due to slip.
Function:
[0 - 100 %] Speed for evacuation after
detection of light-load direction.
Function:
[ 0.01 - 3600 Ramp times during evacuation and
s] measurement sequences
Function:
NOTICE
Simple Profile
This parameter is available in
FC 302 only.
Select how the heat sink fan
responds to operating conditions.
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