Danfoss VLT AutomationDrive FC 301 Programming Manual page 126

Parameter Descriptions
3 3
External Set-point
Illustration 3.48 Speed Trim
Illustration 3.48 shows a single source set-up where the
master sends the torque signal to all followers. The
number of available analog outputs on the master limits
this set-up. To overcome the limitation of the number of
analog outputs, use a cascade principle. The cascade
principle makes the control slower and less accurate
compared with the set-up using analog outputs.
7-01 Speed PID Droop
The droop function allows the frequency converter to decrease
the motor speed proportional to the load. The droop value is
directly proportional to the load value. Use the droop function
when several motors are mechanically connected and the load
on motors can differ.
Ensure that parameter 1-62 Slip Compensation has a default
setting.
Range:
0 RPM
*
124
®
VLT AutomationDrive FC 301/302
VLT 1
Set-point
Ramp
Calculation
VLT 2
Set-point
Ramp
Calculation
VLT 3
Set-point
Ramp
Calculation
Function:
[0 - 200 RPM] Enter the droop value at
100% load.
Danfoss A/S © 01/2018 All rights reserved.
Speed Torque
PID
Speed Torque
-
PID
Droop
Torque
Speed
-
PID
Droop
7-02 Speed PID Proportional Gain
Range: Function:
0 [0.000 - Enter the speed controller proportional gain. The
N/A 1.000 proportional gain amplifies the error (that is, the
N/A] deviation between the feedback signal and the
*
setpoint). This parameter is used with
parameter 1-00 Configuration Mode [0] Speed
open loop and [1] Speed closed loop control.
Quick control is obtained at high amplification.
Increasing amplification makes the process less
stable.
Use this parameter for values with 3 decimals.
For values with 4 decimals, use
parameter 3-83 Quick Stop S-ramp Ratio at Decel.
Start.
M1
PID
M2
PID
M3
PID
MG33MO02