S
ection
3
Generator Voltage
Generator voltage is monitored at terminals E1 (A-phase), E2 (B-phase), and E3 (C-phase). Nominal voltages of
up to 600Vac may be sensed at these terminals. Voltage applied to these inputs is scaled and conditioned before
being applied to the input of the ADC. The voltage signal from phase C and A (V
C-A
) of the generator is used by
the ADC to calculate the rms value of generator voltage across phases C and A. Likewise, the voltage signal from
phase C and B (V
C-B
) of the generator is used by the ADC to calculate the rms value of generator voltage across
phases C and B. The rms value of generator phase B to phase A voltage (V
B-A
) is calculated by the microprocessor
from the phase C to phase A signal (V
C-A
)and the phase C to phase B (V
C-B
) signal.
Additionally, the generator phase C to phase A (V
C-A
) signal is applied to a ltered zero cross detector circuit. This
signal is applied to the microprocessor and is used to calculate generator frequency.
Phase B Line Current
The phase B line current (I
B
) signal is developed through a customer supplied current transformer (CT) and
monitored through terminals CT1 and CT2. Current up to 5 amperes rms may be monitored at these terminals.
The current monitored at these terminals is scaled and conditioned by an internal current transformer and active
circuitry for use by the ADC. The signal applied to the ADC is used to calculate the rms value of phase B line
current.
Additionally, the phase angle between phase B line current and phase C to phase A generator voltage is calculated
for use during Droop and Var/Power Factor operation.
CAUTION
The DVR2000E CT connections are reversed from the DVR2000.
Field Voltage (VFIELD)
Voltage across the regulator eld output terminals, F+ and F-, is monitored, scaled, and conditioned before being
applied to the ADC. This signal is used to calculate the dc value of eld voltage for use in system protection.
Field Current (IFIELD)
Current through the main power output switch is converted to a proportional voltage level. This voltage signal is
scaled and conditioned before being applied to the input of the ADC. The result is used to calculate the dc value
of eld current for use in the Manual mode of operation as well as protection of the system.
Analog (Auxiliary) Input
CAUTION
If the DC voltage is removed from the Analog (Auxiliary) Input, the operating setpoint will
return to the original value.
This input allows adjustment of the DVR-2000E regulation setpoint by the application of a positive or negative
dc voltage across terminals A and B. Voltage up to +3 Vdc may be applied at this input. The circuit induces a
1,000-ohm burden on the dc source. The application of a +3 Vdc signal corresponds to a +30 percent change in
setpoint.
Contact Input Circuits
Four contact input circuits powered from an internal 13 Vdc supply provide input control from user-supplied
contacts.
18
3
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