TP-6735 7/1766 Section 5 Component Testing and Adjustment
5.7 Voltage Connections
5.7.1 Voltage Connections,
Single-Phase Models
Single-phase generator sets are available from the
factory connected for 115/230 volt 50 Hz or 120/240 volt
60 Hz. See Figure 5-11 for the factory connections.
Generator sets are not reconnectable.
4321
Stator Leads
LO
GRD
L2
L1
LO (Neutral)
Line
Side
Factory two-pole
circuit breaker
Ground
Load
Side
TP-5867
L0-L1
L0-L2
L1-L2
60 Hz
120 volt
120 volt
240 volt
50 Hz
115 volt
115 volt
230 volt
Figure 5-11 115/230 and 120/240 Volt, 3-Wire
Configurations
5.7.2 Voltage Regulation
Voltage regulation is performed by the controller. The
controller monitors generator output voltage and
adjusts the excitation current to the rotor.
5.8 Voltage Adjustment
The factory sets the voltage for correct generator
operation under a variety of load conditions. Usually,
the voltage needs no further adjustment.
Adjust the voltage when necessary according to the
following procedure. The adjustment procedure
requires a meter that can measure voltage and
frequency.
Use the RDC controller keypad or a personal computer
running Kohlerr SiteTecht software to adjust the
voltage, gain, and volts/Hz.
When using the RDC controller keypad, the controller
will time out and exit the adjustment mode after
approximately 1 minute if no buttons are pressed. Any
unsaved changes are discarded if the controller times
out before the settings are saved. See Figure 5-15 for
instructions to save your settings.
The DC controller is not equipped with a keypad. A
personal computer running Kohler SiteTech software is
required for all adjustments to the DC controller.
SiteTech software is available to Kohler authorized
distributors and dealers (through their distributor).
Voltage Adjustment. Adjusts generator output
between 100 and 130 volts.
Gain (Stability) Adjustment. Fine tunes regulator
circuitry to r educe light flicker.
Volts/Hz Adjustment (voltage droop). Determines
frequency (Hz) at which generator output voltage
begins to drop. The controller maintains generator
output at the specified voltage under load until the
generator engine speed drops to a preset level (see
Figure 5-14 for cut-in frequencies). Then the controller
allows the generator voltage and current to drop. The
voltage/current drop enables the engine to pick up the
load. When the generator speed returns to normal (60
Hz or 50 Hz) as load is accepted, the generator output
also returns to normal. See Section 5.8.2 for
instructions to adjust the voltage droop. (SiteTech
software required.)
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