Marathon DVR 2000E - Section 2 • Human-Machine Interface; Lower; Parallel Generator Compensation (52 L;M); Communication Port

S
ection
3
S
ection
3
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.
Var/Power Factor Control (52J/K) Option
Closing a contact across terminals 52J and 52K disables var/power factor control. An open contact enables the
DVR2000E(C) to control the generator reactive power in either the var or the power factor mode. The contact has
no effect when this option is not present. For more information, refer to the Parallel Generator Compensation
(52L/M) contact input.
Parallel Generator Compensation (52L/M)
Closing a contact across terminals 52L and 52M disables parallel operation. An open contact enables parallel
operation and the DVR2000E operates in reactive droop compensation mode.
If the Var/Power Factor Control option is present, the 52J/K input has priority. Therefore, if the 52J/K and the 52L/M
inputs are both open, the system operates in var/power factor mode.
Communication Port
The communication port provides the interface for user programming (setup) of the DVR2000E. Connection is
made to the female RS-232 (DB-9) connector with a user-supplied, standard 9-pin cable. The communication port
is optically isolated and is powered from a transformer-isolated supply.
Microprocessor
The microprocessor is the heart of the DVR2000E and performs measurement, computation, control, and
communication functions by the use of its embedded programming and the nonvolatile settings stored in its
memory.
Power Input Stage
Input power is applied to terminals 3 and 4 from the PMG. It is rectied and ltered before being applied to the
power amplier and the power supply. Input power is single-phase in the range of 180 to 240 Vac at a frequency
of 200 to 360 hertz.
Power Supply
The internal switch-mode power supply receives power from the power input stage and supplies power at the
required dc voltage levels to the internal circuitry of the DVR2000E.
Power Amplier Stage
The power amplier receives power from the power input stage and supplies a controlled amount of power to the
exciter eld via terminals F+ and F-. The amount of power supplied to the exciter eld is based on gating pulses
received from the microprocessor. The power amplier uses a solid state power switch to provide the required
power to the exciter eld. Power amplier output to the eld is rated up to 75 Vdc at 3 Adc continuous and 150
Vdc at 7.5 Adc for 10 seconds.
Front Panel Indicators
Twelve front panel LED indicators light to indicate various operating modes, protective functions, and adjustments.
Section 2, Human-Machine Interface provides more information about the front panel indicators.
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