1-65 Resonance Damping Time Constant
Range:
Function:
5 ms
*
[1 - 50 ms]
NOTICE
Parameter 1-65 Resonance
Dampening Time Constant
has
no effect when
parameter 1-10 Motor
Construction
=
[1] PM, non-
salient SPM
.
Set
parameter 1-64 Resonance
Dampening
and
parameter 1-65 Resonance
Dampening Time Constant
to help
eliminate high-frequency resonance
problems. Enter the time constant
that provides the best dampening.
1-66 Min. Current at Low Speed
Range:
Function:
Size
related
*
[ 1 - 200 %]
Enter the minimum motor current
at low speed, see
parameter 1-53 Model Shift
Frequency
. Increasing this current
improves motor torque at low
speed.
Parameter 1-66 Min. Current at Low
Speed
is enabled when
parameter 1-00 Configuration Mode
is set to
[0] Speed open loop
only.
The frequency converter runs with
constant current through motor for
speeds below 10 Hz.
Parameter 4-16 Torque Limit Motor
Mode
and/or
automatically
adjust
parameter 1-66 Min. Current
at Low Speed
. The parameter with
the highest value adjusts
parameter 1-66 Min. Current at Low
Speed
. The current setting in
parameter 1-66 Min. Current at Low
Speed
is composed of the torque
generating current and the
magnetizing current.
Example: Set
to 100% and set
parameter 4-17 Torque Limit
Generator Mode
to 60%.
Parameter 1-66 Min. Current at Low
Speed
automatically adjusts to
about 127%, depending on the
motor size.
4.2.7 1-7* Start Adjustments
1-70 Start Mode
Select the start-up mode. This is done to initialize the VVC
+
control core for previously free-running motor. Both selections
estimate the speed and angle. Active for PM and SynRM motors
in VVC
+
only.
Option:
Function:
[0]
*
Rotor
Detection
Estimates the electrical angle of the
rotor and uses this as a starting
point. Standard selection for VLT
®
AutomationDrive applications.
[1]
Parking
The parking function applies DC
current across the stator winding
and rotates the rotor to electrical 0
position (typically selected for HVAC
applications). Parking current and
time are configured in
parameter 2-06 Parking Current
and
[2]
Rotor Det. w/
Parking
1-71 Start Delay
Range:
Function:
0 s
*
[0 - 25.5 s]
This parameter refers to the start
function selected in
parameter 1-72 Start Function
.
Enter the time delay required
before commencing acceleration.
1-72 Start Function
Option:
Function:
Select the start function during
start delay. This parameter is linked
to
parameter 1-71 Start Delay
.
[0]
DC Hold/delay
time
Energizes motor with a DC hold
current (
) during the start delay time.
[2]
*
Coast/delay
time
Motor coasted during the start
delay time (inverter off).
[3]
Start speed
cw
Only possible with VVC
+
.
Connect the function described in
parameter 1-74 Start Speed [RPM]
and
in
the start delay time.
Regardless of the value applied by
the reference signal, the output
speed applies the setting of the
start speed in
or
, and the output current
corresponds to the setting of the
Parameter Descriptions
Programming Guide
MG06J202
Danfoss A/S © 03/2019 All rights reserved.
43
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Summary of Contents for VLT AutomationDrive FC 361
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