Introduction and Functional Description
Caution: Read This Installation Manual
Carefully and Entirely!
Warning: Do not use digital equipment to read voltage, Hz, or amperage during this
installation. Use only Analog sensing equipment! Failure to do so may result in damage to
equipment or in personal injury!
ALWAYS perform all setup procedures off-line
ALWAYS wear eye protection
ALWAYS strip wire insulation properly or use insulated connectors
ALWAYS use analog metering equipment when setting up the regulator
ALWAYS ensure the regulator receives ample airflow
NEVER hold the regulator in your hand when energized
NEVER install the regulator in a place it can get wet or is exposed to the elements
NEVER mount the regulator over a screw, bolt, rivet, welding seam, or other fastener
NEVER remove the regulator cover while the unit is in operation
NEVER insert a screwdriver or other object under the regulator cover
NEVER install a switch in the DC portion of the regulator’s wiring
NEVER USE A DIGITAL FREQUENCY METER (It can give a false reading!)
Functional Description
The XR8 Universal Voltage Regulator is the result of over 25 years of engineering efforts and offers high-demand features at a
competitive price point. The XR8 is a proven design and is engineered to greatly simplify setup while offering extreme reliability
in demanding service conditions. When properly installed, the XR8 Universal Voltage Regulator is designed to provide a lifetime
of service.
A Generator voltage regulator has several automated tasks it must perform in order to provide reliable, clean, and regulated
electricity. It must build-up the generator, regulate the terminal voltage within its design specifications, and protect both itself
and the generator should a fault situation arise.
The XR8 contains a time-proven, extremely reliable circuit for build-up functionality, in use for over 25 years. Due to its
simplicity, the XR8 is able to build up generators with residual voltages from 3.5VAC without initial overshoot or excessive delay.
The patented circuitry contained in the XR8 automatically adjusts the regulator to match the generator’s response time,
minimizing setup complexity while maximizing load acceptance and rejection performance. The XR8 is a precision voltage
regulator and is capable of regulating the terminal voltage of the generator within +/-.25% of its initial set point.
The XR8 uses field-replaceable 3AG ceramic cartridge fuses to protect its internal circuitry should a fault occur and the exciter
field current exceeds what the regulator is capable of delivering. It also contains a unique frequency-selectable Volts-Per-Hertz
circuit, which helps a turbo-charged engine accept a large load, and also helps to protect the generator rotor and exciter if the
engine is idled with the regulator still energized.
Due to its extreme simplicity, the XR8 Universal Voltage Regulator is uncommonly reliable and offers features and regulation
accuracy usually only offered by much more complicated and often much more expensive regulators.
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