Woodward EPG 524 Installation And Troubleshooting Manual page 14

EPG Electrically Powered Governor
To decrease ringing (will increase settling time) after a transient, turn the
GAIN pot counterclockwise slightly, then turn the STABILITY pot as required
to eliminate oscillation and obtain desired response. Repeat if necessary.
17. Select alternate dynamics and alternate fuel, if applicable. Repeat this step
as necessary.
This completes the check of units without droop. For units with droop, do the
following additional steps.
Droop Adjustment (only for units with droop)
NOTE
The EPG Load Sensor Module cannot be used with the EPG model that has
internal droop.
For Isolated Load:
1. Connect the PT wires to terminals 9 and 10 and the CT wires to terminals
11 and 12. Verify correct polarity (see the wiring diagram).
2. Adjust the RATED SPEED pot for rated speed with no load.
3. Apply 100% rated load or available load.
WARNING—OVERSPEED
If engine speed increases when load is applied, there is danger of death,
personal injury, or damage to equipment. Be prepared to control the engine
or turbine manually by forcing the actuator arm toward the minimum-fuel
position. If engine speed does increase with load, reverse either the PT or
CT input wires.
4. Adjust the DROOP pot to give a speed of:
%DroopxRated Speed
Rated Speed -
Example 1:
The generator set is a 60 Hz unit with an isolated load. If the desired droop
is 5% and the generator set can be run at 100% load, then the speed at full
load would be 57 Hz.
Example 2:
It is again desired to set the droop of the same generator set to 5%, but this
time the generator set cannot be run at 100% load. The generator set is
therefore run at 50% load and the speed (in step 3) would be 58.5 Hz.
Example 3:
The generator set is a 60 Hz unit that will be paralleled with an infinite bus. If
the desired droop is 5% and the generator set can be run at 100% load, the
speed at which the generator is run (in step 2) would be 63 Hz.
10
%Load
x
100% 100%
Manual 82329
Woodward