TP-6694 7/18 33Section 1 Specifications and Features
1.3.2 Voltage Regulator and Calibration
Specifications
The controller has a voltage regulation function that is
internal to the processor. This means that no external
voltage regulator is necessary. The voltage regulation
of the controller uses root mean square (rms) sensing
for fast response to changes in indicated and regulated
voltages resulting in excellent regulation accuracy.
1.3.3 Voltage Regulator Adjustments
The descriptions of the voltage regulator adjustments
and features follow. Refer to the Factory-Defined
Settings List shown in 1.3.1 for voltage regulator
adjustments. See Appendix C, Voltage Regulator
Definitions and Adjustments, for additional information
and to customize adjustments for specific applications.
Voltage Adjustment. The voltage adjustment allows
the user to enter the desired generator set output level.
This regulated level setting is the average of the three
line-to-line voltages in three-phase configurations or
L1-to-L2 in single phase configurations.
Submenus display the individual line-to-line voltages.
These voltages are for reference only and are relevant
in unbalanced load conditions. The voltage adjust
setpoint can be changed to accommodate an important
phase in an unbalanced system.
Underfrequency Unload Frequency Setpoint. This
adjustment affectsthe voltage droop (volts per Hz) when
load is applied and underfrequency occurs. The
underfrequency unload setting defines the
setpoint
where underfrequency starts
. Any frequency below the
setpoint causes the voltage to drop thus reducing the
load allowing the engine speed to recover according to
the underfrequency unload slope setting.
Engine speed recovery depends upon characteristics
such as engine make, fuel type, load types, and
operating conditions. The underfrequency unload
setting should match the engine speed recovery
characteristics for the application.
Underfrequency Unload Slope. This setting
determines how much the voltage drops during an
underfrequency condition. Typically, applying a large
electrical load causes a dip in engine speed and
frequency. The voltage regulator reduces voltage,
allowing engine speed recovery. The volts-per-Hz
setting determines the amount of voltage drop
.
Regulator Gain. Regulator gain refers to the gain of the
control system. Generally, the higher the gain the faster
the system responds to changes and the lower the gain,
the more stable the system.
If the voltage is slow to recover when loads are applied
or removed, increase the regulator gain. If the voltage is
unstable, decrease the regulator gain.
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