5-14
Copyright 2017 Cummins Inc.
Governor/Regulator Menu
The GOV/REG submenus permit adjustment of
voltage regulator and governor parameters.
All GOV/REG menu values, except for REG VHZ and
GOV RAMP, will display “100%”. The expression
“100%” represents the factory setting (default value)
for the selected set. When increasing or decreasing
the value, you are increasing or decreasing from the
factory default value. (For example, entering “200%”
will double the value; “50%” will decrease the value
by one half.)
Default values are preset by the factory. Due to site
variables, the default values may need to be adjusted
to attain peak performance.
The facing page shows a block representation of
the GOV/REG submenus, which is the third of four
SETUP/CAL menus. If you press the button next to
the “>>” in the Main menu display, the VERSION/
SETUP/CAL submenu will appear.
CAUTION
Improper calibration or adjustment
of the PowerCommand control can cause
equipment malfunction or damage. Calibration
and adjustment must be performed by techni-
cally qualified personnel only.
GOV/REG submenu: The GOV/REG submenus
are intended for qualified service personnel only.
For this reason, a three-digit access code must be
entered before you can proceed to those menus.
Select SETUP/CAL. The display will show the EN-
TER CODE submenu. Enter the access code (574)
as previously described in this section.
From the DISPLAYS/METERS submenu, press the
button next to the “>>” in the display to move to the
GOV/REG/SETUP submenu. Select GOV/REG to
proceed to the GOV/REG submenus.
Use the buttons next to the “
” and “” symbols to
adjust the selected governor and regulator parame-
ters. Press the button next to the “>>” in the display
to move to the next adjustment.
GOV GAIN: If the gain adjustment is set too high,
engine speed will “hunt” or oscillate. If gain is set too
low, the engine will respond too slowly to changes in
load—overspeed may result.
GOV INTEGRAL: If this adjustment is set too low,
the engine will respond too slowly to changes in
load. If it is set too high, engine response will be un-
stable.
GOV RAMP: This adjustment sets the time for the
engine to ramp to full operating speed. This adjust-
ment applies only to set start up and does not affect
the transient response. (Adjustable range: 0
through 10 seconds.)
REG GAIN: If the gain adjustment is set too high,
output voltage will be unstable. If gain is set too low,
the output voltage will respond sluggishly to
changes in load—overshoot may result.
REG INTEGRAL: If this adjustment is set too low,
the output voltage will respond sluggishly to
changes in load, resulting in a droop-type response
If it is set too high, output voltage will be unstable.
REG VHZ: This underfrequency roll-off adjustment
controls how much excitation is reduced in re-
sponse to underfrequency. If the value is set too
low, excitation will be cut too fast, and the voltage
will drop too much. If set too high, the generator set
may not be able to pick up rated load in one step.
(Adjustable range: 1 through 50; normal range 7
through 21.)
SAVE/EXIT submenu: From the REG VHZ subme-
nu, press the button next to the “>>” in the display to
move to the SAVE/EXIT submenu. Select SAVE to
save your changes. At the CHANGES SAVED sub-
menu, select EXIT to return to the DISPLAYS/ME-
TERS submenu.
If you select SAVE, the adjustments will be retained
after shutdown, and will be in effect when the set is
restarted. If you select EXIT without saving first, the
adjustments will remain in effect until the generator
set is shut down, but will be reset (and will not be in
effect) when the set is restarted.
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