Marathon Electric DVR 2000E - SET-UP for Paralleling

S
ection
8
53
SECTION 8 • DVR
®
2000E VOLTAGE REGULATOR
SET-UP F
OR PARALLELING WITH THE
COMPUTER
PROCEDURE
For generators to parallel properly certain conditions m
us
t be met. The governors must be set for the engine
speed, response and load sharing to match all
units. The regulators must be set to provide matching voltage,
droop and response on all units.
To parallel generators, set-up one generator set for single unit operation
.
Insure that a CT is installed on phase B of the
generator and connected per Fi
gure 4
-6.
Open communications between the computer and the voltage regulator.
On the
‘System
Settings’
s
creen, enter the CT ratio (500:5 has a ratio of
100) in the lower right area of the screen
under
‘
Generator CT Ratio’
. Note: The CT must have a secondary rated at 5 amps.
Click on the
‘Settings’
button in the upper tool bar. On the
‘Setpoint’
tab, in the lower left under the
‘Droop’
section, enter the
value
‘4’
in the
‘Setpoint (%)’
area.
Next, refer to t
he
‘Automatic Voltage Regulator (AVR)’
sec
tion located above
on
the
top left hand side of the
screen. If the generator
is to operate in droop, increase the
‘AVR Setpoint (V)’
value by
‘3%’
. For a 480
-volt
operation, the calculated value to enter would be
‘494’
volts. This will cause the generator to operate at
approximately 480 volts under load.
Press the
‘EEPROM
’
button in the upper
tool bar to save the settings
to permanent memory.
Save the settings to a fi le.
For identical generators, load these s
For identical generators, load these s
ame settings into all other regulators to
ame settings into all other regulators to
be paralleled.
be paralleled.
One at a tim
e, place a resistive load on each individual generator.
Clic
k on the
‘Metering’
button in the upper tool bar. If the paralleling CT is connected correctly, the
‘Real Power
(
W)’
value will read positive and the
‘Phase Ang
le
(
Degree)’
value will read aroun
d
‘0’
or
‘360
’
degrees. If the
paralleling CT is connected backwards, the
‘Real Power (
W)’
value will read negative and the
‘Phase Angle’
value
will read aroun
d
‘180’
degrees. If the CT is connected backwards, shut the generator set down and swap
the connections between CT1 and CT2 on the voltage regulator.
Before paralleling generators, insure that the phase rotation of the generators is the same.
When the generators are operating in parallel, the governor controls the
KW sharing between the generators. This
can be the cause of any current unbalance when the units are paralleled. Attempting to further adjust the voltage
regulators will probably make
things worse, not better.
If cross current compensation is desired, the loop can no
w be conn
ected after the generator
sets are working
properly in droop.
For single unit operation, a swit
ch that is closed across terminals 52L a
nd 52M will disable the
droop func
tion.