Basler Electric BE2000E - Manual (Page 22)

14 9287500995 Rev B
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 filtered 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.
Field Voltage (
VFIELD
)
Voltage across the regulator field 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 field voltage for use in
system protection.
Field Current (I
FIELD
)
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 field 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 BE2000E 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.
Raise
Closing a contact across terminals 6U and 7 causes the active operating setpoint to increase. This
function is active as long as the contact is closed.
Lower
Closing a contact across terminals 6D and 7 causes the active operating setpoint to decrease. This
function is active as long as the contact is closed.
Functional Description BE2000E