TP-6805 8/15100 Section 6 Component Testing and Adjustment
6.7 Voltage Adjustments
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
Testing live electrical circuits. Hazardous voltage or
current can cause severe injury or death. Have trained and
qualified personnel take diagnostic measurements of live
circuits. Use adequately rated test equipment with electrically
insulated probes and follow the instructions of the test
equipment manufacturer when performing voltage tests.
Observe the following precautions when performing voltage
tests: (1) Remove all jewelry. (2) Stand on a dry, approved
electrically insulated mat. (3) Do not touch the enclosure or
components inside the enclosure. (4) Be prepared for the
system to operate automatically.
(600 volts and under)
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
Note: See Section 4.8 for voltage calibration
instructions.
Voltage Adjustments Using SiteTech
The SiteTech parameters used to adjust the voltage are
shown in Figure 6-12.
SiteTech Group Parameter
Genset System Configuration Genset System Voltage
Voltage Regulator Average Voltage Adjustment
Volts per Hertz Slope
Volts per Hertz Cut-in
Frequency
Voltage Regulator Gain
Figure 6-12 SiteTech Parameters for Voltage
6.7.1 Voltage Regulator Average
Vo ltage Adjustment
Voltage regulation is performed by the controller. The
controller monitors generator output voltage and adjusts
the excitation current to the rotor.
Excitation current control is performed by the patented
Kohler Hybrid Voltage Regulator. This regulator
consists of a fast-reacting analog inner loop and a
slower digital outer loop. The inner loop regulates the
average output voltage to a setpoint which is controlled
by the outer loop, allowing the voltage to recover very
quickly during transient conditions. The outer loop
measures the RMS magnitude of the voltage and
adjusts the setpoint for the inner loop until the RMS
voltage amplitude matches the Voltage Regulator
Average Voltage Adjustment setpoint.
The hybrid regulator should require no voltage
adjustment, as it regulates the RMS output voltage to
the configured output voltage. The Voltage Regulator
Average Voltage Adjustment setpoint may require
alteration to more closely match the utility voltage at a
particular location or to compensate for voltage drop on
wiring between the generator and the ATS.
The Voltage Regulator Average Voltage Adjustment can
be adjusted from the Voltage Regulator menu on the
RDC2 controller, or adjusted using SiteTech. See
Figure 6-12 and Figure 6-13.
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