Danfoss VLT Midi Drive FC 280 Programming Manual page 38

Parameter Descriptions
1-55 U/f Characteristic - U
Range:
Size
related V]
*
4 4
1-56 U/f Characteristic - F
Range:
Size [ 0 -
related 500.0
*
Hz]
1-60 Low Speed Load Compensation
Range:
100 % [0 -
*
300 %]
1-61 High Speed Load Compensation
Range:
100 % [0 -
*
300 %]
1-62 Slip Compensation
Range:
Size [ -400 -
related 399.0 %]
*
36
Function:
[0 - 1000 Enter voltage at each frequency point
to manually form a U/f characteristic
matching motor. Frequency points are
defined in parameter 1-56 U/f Charac-
teristic - F.
Function:
Enter frequency points to form a U/f charac-
teristic matching motor. Voltage at each point
is defined in parameter 1-55 U/f Characteristic
- U.
Make a U/f characteristic based on 6
definable voltages and frequencies, see
Illustration 4.2.
Motor Voltage
Par 1-55 [x]
1-55[5]
1-55[4]
1-55[3]
1-55[2]
1-55[1]
1-55[0]
1-56 1-56 1-56 1-56
[0] [1] [2] [3]
Illustration 4.2 Example of U/f Charac-
teristic
Function:
Enter the low-speed voltage compensation
value in percent. This parameter is used for
optimizing the low-speed load performance.
This parameter is only active if
parameter 1-10 Motor Construction = [0]
Asynchron.
Function:
Enter the high-speed load voltage compen-
sation value in percent. This parameter is
used for optimizing the high-speed load
performance. This parameter is only active if
parameter 1-10 Motor Construction = [0]
Asynchron.
Function:
Enter the % value for slip compensation
to compensate for tolerance in the
value of n . Slip compensation is
M,N
calculated automatically, that is, based
on the nominal motor speed n
Danfoss A/S © 07/2016 All rights reserved.
®
VLT Midi Drive FC 280
1-63 Slip Compensation Time Constant
Range:
0.1 s
*
1-64 Resonance Dampening
Range:
100
%
*
1-65 Resonance Dampening Time Constant
Range:
0.005 s
*
1-56
1-56
[5]
[4]
Output Frequency
Par 1-56 [x]
1-66 Min. Current at Low Speed
Range:
50 %
*
120 %]
1-70 PM Start Mode
Select the PM motor start-up mode. To initialize the VVC
core for previously free-running PM motor. Active for PM motors
+
in VVC
speed).
Option:
[0] Rotor Detection Estimate the electrical angle of the rotor
*
[1] Parking
.
M,N
Function:
[0.05 - 5 s] Enter the slip compensation reaction speed.
A high value results in slow reaction, and a
low value results in quick reaction. If low-
frequency resonance problems occur, use a
longer time setting.
Function:
[0 - Enter the resonance dampening value. Set
500 %] parameter 1-64 Resonance Dampening and
parameter 1-65 Resonance Dampening Time
Constant to help eliminate high-frequency
resonance problems. To reduce resonance
oscillation, increase the value of
parameter 1-64 Resonance Dampening.
Function:
[ 0.001 - Set parameter 1-64 Resonance Dampening
and parameter 1-65 Resonance Dampening
0.05 s]
Time Constant to help eliminate high-
frequency resonance problems. Enter the
time constant that provides the best
dampening.
Function:
[ 0 - Enter the minimum motor current at low
speed. Increasing this current improves
motor torque at low speed.
Parameter 1-66 Min. Current at Low Speed is
enabled only for PM motor.
only if the motor is stopped (or running at very low
Function:
and uses this angle as a starting point.
This option is the standard selection for
industrial applications. If flystart detects
that the motor runs at low speed or has
stopped, the frequency converter detects
the rotor position (the angle), and starts
the motor from that position.
The parking function applies DC current
across the stator winding and rotates the
rotor to electrical 0 position. This option is
typically for pump and fan applications. If
flystart detects that the motor runs at low
+ control
MG07C302