Danfoss FC 51 Series Programming Manual page 19

Parameter Descriptions
1-61 High Speed Load Compensation
Range: Function:
Use this parameter to obtain optimum load
compensation when running at high speed.
100 % [0-199 %] Enter percentage to compensate in relation
*
to load when motor runs at high speed.
Change-over point is automatically
calculated based on motor size.
1-62 Slip Compensation
Range: Function:
100 % [-400-399 Compensation for load dependent motor
*
%] slip.
Slip compensation is calculated automat-
ically based on rated motor speed, n
NOTE
This function is only active when
1-00 Configuration Mode, is set to [0]
Speed Open Loop and when 1-01
Motor Control Principle, is set to [1]
plus
VVC
1-63 Slip Compensation Time
Range: Function:
0.10 s [0.05-5.00 s] Enter slip compensation reaction speed. A
high value results in slow reaction whereas
a low value results in quick reaction.
If low-frequency resonance problems arise,
use longer time setting.
4.2.5 1-7* Start Adjustments
Considering the need for various start functions in different
applications, it is possible to select a number of functions
in this parameter group.
1-71 Start Delay
Range: Function:
The start delay defines the time to pass from
a start command is given until the motor
starts accelerating.
Setting start delay to 0.0 s disables 1-72 Start
Function, when start command is given.
0.0 s [0.0-10.0 Enter the time delay required before
*
s] commencing acceleration.
1-72 Start Function is active during Start delay
time.
®
VLT Micro Drive FC 51 Programming Guide
1-72 Start Function
Option:
[0]
[1]
[2]
1-73 Flying Start
Option:
.
M,N
[0]
[1]
4.2.6 1-8* Stop Adjustments
To meet the need for various stop functions in different
application these parameters offer some special stop
features for the motor.
1-80 Function at Stop
Option:
[0]
[1]
1-82 Min. Speed For Function at Stop [Hz]
Range:
0.0 Hz
®
MG02C602 - VLT is a registered Danfoss trademark
Function:
DC Hold/Delay Motor is energised with DC holding
Time current (2-00 DC Hold Current) during
start delay time.
DC Brake/Delay Motor is energised with DC braking
Time current (2-01 DC Brake Current) during
start delay time.
Coast/Delay Inverter is coasted during start delay time
*
Time (inverter off).
Function:
The Flying Start parameter is used to catch a
spinning motor after eg. mains drop-out.
NOTE
This function is not suitable for hoisting
applications.
Disabled Flying start is not required.
*
Enabled Frequency converter enabled to catch spinning
motor.
NOTE
When flying start is enabled 1-71 Start Delay,
and 1-72 Start Function, have no function.
Function:
The selected function at stop is active in following
situations:
•
Stop command is given and output
speed is ramped down to Min. Speed for
Function at Stop.
•
Start command is removed (standby),
and output speed is ramped down to
Min. Speed for Function at Stop.
•
DC-brake command is given, and DC-
brake time has passed
•
While running and calculated output
speed is below Min. Speed for Function at
Stop.
Coast The inverter is coasted.
*
DC The motor is energised with a DC current. See
hold 2-00 DC Hold Current for more information.
Function:
[0.0-20.0 Hz] Set the speed at which to activate 1-80
*
Function at Stop.
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