Woodward DSLC-2 - Woodward

Manual 37443A DSLC-2 - Digital Synchronizer and Load Control
Page 66/226 © Woodward
ID
Parameter
CL
Setting range
Default
Description
5512
Frequency
trim deriva-
tive ratio
2
0.01 to 100.00
0.01
The derivative ratio identifies the “D” part of the PID controller. By
decreasing this parameter, the stability of the system is increased.
The controller will attempt to slow down the error correction in an
attempt to prevent excessive overshoot or undershoot. Essentially
this is the brake for the process. This portion of the PID loop op-
erates anywhere within the range of the process unlike reset. Re-
member the frequency trim PID is active during load sharing. Set-
ting the derivative ratio to high may cause instability with the load
sharing function.
NOTE: The derivative ratio constant must be smaller than the
integral gain constant.
PID Power Control
ID
Parameter
CL
Setting range
Default
Description
5513
Base load
proportional
gain
2
0.01 to 100.00
1.00
Base load proportional gain determines how fast the load control
responds to a load error. Lower value to slow response.
NOTE: PID power control loop is active:
• Base load mode – always integral control
•
Active MSLC-2 – always integral control
5514
Base load
integral gain
2
0.01 to 100.00
0.50
Base load integral gain compensates for lags in the load control
loop. It prevents slow hunting and controls damping (overshoot or
undershoot) after a load disturbance. Lower value to slow re-
sponse.
NOTE: PID power control loop is active:
• Base load mode – always integral control
•
Active MSLC-2 – always integral control
5515
Base load
derivative
ratio
2
0.01 to 100.00
0.01
Base load derivative ratio adjusts the rate of change in speed bias
output during a load transient. This value is normally set very
small.
NOTE: PID power control loop is active:
• Base load mode – always integral control
•
Active MSLC-2 – always integral control
Active Power Loadshare
ID
Parameter
CL
Setting range
Default
Description
4522
Load share
gain
2
0.00 to 100.00
0.50
Load share gain is adjusted to provide stable load sharing. When
load sharing is unstable, lower the gain value. Remember the fre-
quency trim PID is active during load sharing mode.
4546
Load share
factor
2
10 to 90 %
50 %
Adjusts the weighting between load share error signal and fre-
quency error signal.
Example:
60 % - Will influence load sharing more than frequency trim
40 % - Will influence frequency trim more than load sharing