Parallel Configuration for Connection B
To use the XR8 Universal Voltage Regulator in a parallel configuration either with another generator
or with a buss such as a utility, use the diagram below for proper hookup with the XR8 configured for
Connection B.
NOTE: Power-Tronics products parallel using the Reactive Droop compensation method. This allows our products to
parallel with existing systems easily while also allowing islanded operation with the flip of a switch. When initially installing
the droop resistor, set it for approximately 7Ω before final adjustment later. If the droop is excessive when load testing,
reduce the resistance a bit at a time until satisfactory droop is achieved.
CT should be sized at 25-35VA burden!
• Isolation Transformer is
recommended for best
results, but is optional if
208/240V is present on
generator.
• Size CT as closely to rated
generator output amperage
as possible for best
paralleling results. An
oversized CT will result in
poor paralleling or loss of
control!
• If generator terminal voltage
rises, or if generator exports
VARS excessively under
load, reverse CT leads.
• If the reactive droop
resistor/rheostat gives
erratic results or
inconsistent resistance,
lightly sand the exposed
wire with 400 grit sandpaper
to improve connection
between wire and slider.
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