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Specifications
Input Voltage:
Battery Voltage:
Frequency:
Voltage Regulation:
Parallel Operation
Maximum Output Voltage:
Under Frequency Protection:
Physical Size:
Weight:
Fully Encapsulated:
External Voltage Adjustment:
System Operating Indicator:
Optional External Controls:
Optional External Potentiometer:
External Adjustment Range:
208-277vac
12 or 24vdc
50 or 60hz
± 1% From NL to FL
Yes
1.5vdc
Yes, VPH reduction
5 x 3.5 x 1 in.
8 oz
Yes
Yes
Yes, 3
Yes
100KΩ @ 2W
±10% of Terminal Voltage
KFR3
Specialty Series
Automatic Voltage Regulator
For Kohler Fast-Response
Generators
The Power-Tronics KFR3 Automatic Voltage
Regulator is designed as a true standalone
voltage regulator for Kohler Fast-Response
style generators to allow for replacement of
obsolete, incompatible, or intentionally
crippled control equipment and regulation
controls on Fast-Response style generators.
The KFR3 is designed specifically for
Professional Electrical Generator Service
Technicians and the Electrical Generator
Repair Industry. It incorporates an easily
selectable frequency range for voltage roll-
off during under-frequency operation and
offers precise voltage regulation regardless
of the connected load and ambient
temperature. The KFR3 is a ruggedized
design and is engineered to provide a
lifetime of trouble-free, reliable operation.
Stability matching and regulation gain can
be adjusted through patented electronic
circuitry that matches the regulator's
response time to the generator exciter. This
greatly speeds response time of the AVR
and allows tuning to achieve extremely tight
voltage regulation across a variety of load
conditions.
PLC and automated Genset control is
possible with the KFR3 by simply adding an
optional, inexpensive digital interface
module. This capability makes the KFR3
suitable for automated or unattended
installations, or large-scale parallel
operations.
The KFR3 is based on time-tested regulation
circuitry and provides an extremely reliable
and flexible automatic voltage regulator
solution for Kohler Fast-Response style
generators.
© 2024 Power-Tronics, Inc.
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Summary of Contents for Power-Tronics Specialty Series
- Page 1 KFR3 Specialty Series Automatic Voltage Regulator For Kohler Fast-Response Generators The Power-Tronics KFR3 Automatic Voltage Regulator is designed as a true standalone voltage regulator for Kohler Fast-Response style generators to allow for replacement of obsolete, incompatible, or intentionally crippled control equipment and regulation controls on Fast-Response style generators.
-
Page 2: Table Of Contents
Common 12-Lead Generator Wiring Diagrams:............4 KFR-EB Emitter Board:....................5 208-240V Hookup Connection:..................6 Parallel Configuration for 208-240V Hookup Connection:..........7 277V Hookup Connection:.....................8 Initial Setup and Commissioning:.................9 Optional Power-Tronics Add-On Modules:..............10 Installation Warranty Form:..................11 Product Warranty Certificate:..................12 For Technical Support: Visit our website at: www.power-tronics.com... -
Page 3: Introduction And Functional Description
Due to its extreme simplicity, the KFR3 Automatic Voltage Regulator is uncommonly reliable and offers features and regulation accuracy usually only offered by much more complicated and often much more expensive regulators. For Technical Support: Visit our website at: www.power-tronics.com Call Us at: (830) 895-4700... -
Page 4: Common 12-Lead Generator Wiring Diagrams
Voltage L3 – N: 208V Don’t Use Zig-Zag if Possible. NOTE: L3-N is a “High Leg” NOTE: Derate generator by 1/3 rated 208V instead of 120V! capacity when using this connection! For Technical Support: Visit our website at: www.power-tronics.com Call Us at: (830) 895-4700... -
Page 5: Kfr-Eb Emitter Board
Power-Tronics includes our own KFR-EB emitter board with every KFR3 Voltage Regulator as a service item. The KFR3 is designed to operate both our own KFR-EB board and the OEM Kohler component. -
Page 6: 208-240V Hookup Connection
Remote Voltage Adjustment! † NOTE: Battery voltage must be controlled or switched off when generator is not in operation. Use switched Battery source or install toggle switch. For Technical Support: Visit our website at: www.power-tronics.com Call Us at: (830) 895-4700... -
Page 7: Parallel Configuration For 208-240V Hookup Connection
208-240V sensing voltage. 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 2Ω 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. -
Page 8: 277V Hookup Connection
Remote Voltage Adjustment! † NOTE: Battery voltage must be controlled or switched off when generator is not in operation. Use switched Battery source or install toggle switch. For Technical Support: Visit our website at: www.power-tronics.com Call Us at: (830) 895-4700... -
Page 9: Initial Setup And Commissioning
CT leads and try again. 10. Observe voltage regulation during no-load and full-load conditions. Once the voltage is set and regulating characteristics are satisfactory the installation procedure is complete. For Technical Support: Visit our website at: www.power-tronics.com Call Us at: (830) 895-4700... -
Page 10: Optional Power-Tronics Add-On Modules
Optional Power-Tronics Add-On Modules Power-Tronics offers a wide array of optional add-on modules for the KFR3 Automatic Voltage Regulator. For more information on any of the modules below, visit our online catalog at: www.power-tronics.com MOP1224HD Motorized Potentiometer Allows the KFR3 to be... -
Page 11: Installation Warranty Form
This form also contains the information needed by Power-Tronics, Inc., for repair and troubleshooting of any product you may be having problems with. Failure to fill out this form during installation will result in a cancellation of your warranty... -
Page 12: Product Warranty Certificate
These problems should be protected with external devices provided by the customer such as fuses, surge suppressors, over/under voltage and frequency controls. Power-Tronics, Inc., warranties only parts and workmanship of this product for a period of 1 year from the original date of purchase from Power-Tronics, Inc. Under warranty, Power-Tronics, Inc.
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