Manual 37443A DSLC-2 - Digital Synchronizer and Load Control
Page 124/226 © Woodward
9. Voltage bias
a. Menu 6.2
b. Adjust theVoltage control initial state (parameter 5608)
i. Change from 50 % to 60 %
ii. Voltage should increase
iii. If voltage decreased, it tells us that the connection to the voltage regulator is reversed
(backwards)
iv. Change initial state back to 50 %
v. Shutdown the generator set and correct the wiring
vi. Start the generator set and repeat the change from 50 % to 60 %
vii. Voltage should increase
viii. Change from 60 % to 40 %
ix. Voltage should decrease below rated voltage
x. Change back to 50 %
xi. Voltage bias connection is now correct
xii. If the generator voltage is not at rated, adjust the voltage control initial state until rated
voltage is achieved. This setting will be saved as your new initial state value.
10. The adjustment of the frequency and voltage trim PIDs need the DSLC-2 in the isochronous load shar-
ing mode. This is accomplished by closing the “CB Aux” input. If possible to close the generator break-
er and get the true “CB Aux” feedback or to jumper terminal 70 to transfer into the isochronous load
sharing mode.
11. Homepage
a. Load control mode (parameter 4603)
i. Will change from “Droop” to “Load sharing”
b. Reactive load control mode (parameter 7710)
i. Will change from “Inactive” to “Disabled”
12. Frequency trim PID, Menu 2
a. Is actively controlling the frequency of the generator set
b. If unstable, lower the Frequency trim proportional gain (parameter 5510) until stable
c. If stable , increase the proportional gain until some instability is seen
i. Increase at 0.5 increments, wait 30 seconds between changes
ii. If 3.0 is reached and still stable, back down to 2.0
1. The Frequency trim integral gain (parameter 5511) may need adjusted for
faster recovery back to rated frequency, this is best adjusted when performing
load transient testing on the generator set
2. The lower the integral gain setting, the slower the response to return to rated
speed
iii. This PID loop is active when load sharing. If adjusted for very fast response as a sin-
gle generator, may cause unstability when multiple generators are connected
13. Voltage trim PID, Menu 4
a. Configure VAR PF control mode (parameter 7558) for “VAR control”
b. Voltage Trim is now active
i. Voltage trim settings are affected by the droop setting in the voltage regulator
ii. If the voltage regulator is changed, this settings may need re-adjusted
c. If voltage is unstable, lower the Voltage trim proportional gain (parameter 5610) until stable
d. If stable, increase the Proportional gain until some instability is seen
i. Increase at 0.5 increments, wait 30 seconds between changes
ii. If 3.0 is reached and still stable, back down to 2.0 and leave
1. The Voltage trim integral gain (parameter 5611) may need adjusted for faster
recovery back to rated voltage, this is best adjusted when performing load
transient testing on the generator set
2. The lower the integral gain setting, the slower the response to return to rated
voltage
iii. This PID loop is active when in the var sharing mode. If adjusted for very fast re-
sponse as a single generator, may cause unstability when multiple generators are con-
nected.
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