The DKG-171 is a microprocessor controlled unit
designed to monitor the 3-phase mains voltages,
send remote start command to the generating set
and make changeover of both generator and mains
contactors.
The front panel mimic diagram provides information
about mains and generator power availability as
well as contactor positions.
The low limit of the mains and genset voltages may
be manually adjusted via the potentiometer situated
on the left side of the unit. The leftmost position
corresponds to 70 volts, the middle position to 170
volts and the rightmost position to 270 volts-AC.
The DKG-171 continuously monitors the AC mains
phase voltages. If at least one of the phase
voltages goes outside set limits, it initiates a
transfer cycle like below:
-The green MAINS led turns to red.
-The unit deenergizes the mains contactor output
and the green LOAD MAINS led is extinguished.
-After Wait Before Remote Start Delay, the
Remote Start output is energized. The generator
remote start unit receives this signal and runs the
engine.
-When the generator phase voltage is within set
limits, the yellow GENSET led will illuminate and
the unit will allow the genset to run without load
during the Engine Heating Period.
-When the Engine Heating Period is elapsed, the
yellow LOAD GENSET led will start blinking and
the unit will wait for the Generator Contactor
Delay.
-At the end of the Generator Contactor Delay, the
generator contactor output will be energized and
the yellow LOAD GENSET led will illuminate
steadily.
-When all mains phase voltages are within limits,
the MAINS led will turn to green and the unit waits
for Mains Return Delay for stabilization.
-At the end of the Mains Return Delay, the yellow
LOAD GENSET led is extinguished, the generator
contactor output is deenergized and the green
LOAD MAINS led will start blinking. The unit will
wait for Mains Contactor Delay.
-At the end of the Mains Contactor Delay the green
LOAD MAINS led will illuminate steadily, the mains
contactor output is energized and the Remote Start
output is deenergized. The unit will wait ready for a
new mains failure sequence.
The DKG-171 provides a TEST mode pushbutton
allowing the genset to be tested without a mains
failure.
In TEST mode, the Remote Start output will be
energized but no load transfer will take place
unless the occurrence of a mains failure. If the
mains fail, the load will be transferred to the genset.
When the mains voltages are within limits the load
will be transferred to the mains, but the genset will
be kept running. It will only stop if the TEST mode
is cancelled.
