2.45 GHz, 60 KW
This data sheet supersedes any technical data sheet having a
date prior to
March 15, 2006
Power System
This integrated industrial microwave power system uses a CPI
VKS-7960A klystron, designed for industrial service, as the
energy source. By using the high-efficiency, 2.45-GHz, 60 kW
CW klystron in combination with modern control and powersupply technology, CPI is able to furnish a compact, userfriendly, cost-effective industrial system.
The system’s control center is an embedded microprocessor
architecture which provides flexibility in selecting system
operating parameters. Operation is initiated by two independent
external enable commands. Control of the system is through a
web-based browser via a direct Ethernet or web-based
connection. Operational data is logged in the controller’s onboard flash memory. The logged data may be uploaded to the
external computer via the Ethernet connection for use in offline troubleshooting or other purposes.
The high-voltage power supply consists of a phase-angle
adjustable SCR controller, a step-up transformer and a fullwave-bridge rectifier. There is no filter capacitor on the output
of the rectifier, thus very little stored energy, which eliminates
the need for a crowbar. As such, the DC output will have a
ripple voltage of 10% p-p. This has the advantage of causing
RF output amplitude and phase variation which facilitates mode
stirring and potentially a more even heating of the process.
System interlocks will remove the high voltage in less than 10
ms in the event of a fault. In addition, the klystron beam (high
voltage) power supply is remotely located. This makes it
possible to offer the VIS-102B in a corrosion resistant sealed
stainless steel 2-bay enclosure. Cooling for the system is 100%
via water; ambient air is not used for cooling purposes. A small
flow of clean air is used to slightly pressurize the enclosure and
keep potentially corrosive local ambient air from entering the
inside of the enclosure.
CW Power Operation:
Waveguide Arc Detector:
Forward and Reflected Power Monitor:
Adjustable to 60 kW, maximum. Continuous control range in excess of 27 dB.
2.45 GHz nominal. Tunable over plus or minus 5 MHz
Standard. The Klystron window and the waveguide are protected by the control system,
which will interrupt the RF drive power if arcs occur in the waveguide near the
A directional coupler at the klystron output is included. Excessive reflected power will
also interrupt the RF drive power. A liquid-cooled, waveguide circulator capable of
dissipating the full system power is available as an option.
Page 1 of 2
VIS-102B (March 15, 2006)
Communications & Power Industries, Inc., Beverly Microwave Division, 150 Sohier Rd., Beverly, MA 01915-5595, Tel 978-922-6000
Line Current:
480 volts line-line, 4-wire (wire per phase plus ground), 60 Hz
Approximately 165 Amp per phase at 60 KW microwave output power
Clean water from an external source capable of 50 GPM at 60 PSIG, 10 to 40 degrees Centigrade.
Approximate Dimensions:
(maximum in inches)
Other Features:
Approximately2,500 pounds
85 wide X 80 high X 40 deep
The unit has casters for ease of positioning at installation. The unit also has lifting eyes on the top
surface for pick-up via an overhead crane.is easily moved by fork lift or single pallet jack.
Characteristics, dimensions and operating values are based upon design calculations and performance tests. The information in this technical data sheet may change
without notice as the result of additional data or product refinement. Beverly division of CPI should be consulted before using this information for final equipment
All operating, control, and data-collection functions are
performed by the embedded controller. Critical interlocks, such
as those required for system or personnel safety are hard-wired.
The control-center is a digital logic system that monitors and
controls the performance of the microwave power system. All
system parameters, such as beam current, beam voltage and
magnet current are displayed through a web-browser on the
monitor of a remote computer via an Ethernet connection. The
embedded controller takes the required actions to match the
microwave output power to the user’s setpoint command (input
via the browser) for power. In addition, other user controls of
the system are provided. Complete access to the status of each
analog and digital input and output is also remotely available to
the user.
The embedded controller uses flash-memory to log the status of
each of its inputs and outputs in a rolling file system that makes
the last several days of operating available to the user. This data
is stored in a format that will load directly into many
spreadsheet programs for ease of data manipulation. These files
may be e-mailed to CPI for assistance in troubleshooting and
trend analysis should that be desired.
The system consists of 2 enclosures. The beam (high voltage)
power supply may be remotely mounted from the main
enclosure that houses the rest of the system. The main enclosure
is a 2-bay stainless steel cabinet as shown on the first page.
The larger left bay houses the embedded controller, distribution
transformer, and several power supplies. The right bay houses
the klystron, klystron driver, water cooling manifolds, other
components, and output waveguide. Internal air circulating fans
move air through air-water heat exchangers located in the
partition between the 2 bays.
The components in the output waveguide system include a dualdirectional coupler and an optical arc detector. Should an arc occur
in the waveguide run, the arc detector circuitry will remove the RF
drive power to the klystron in less that 10 microseconds after the
arc is detected.
The dual-directional coupler provides a calibrated sample of both
the RF power generated by the system and the RF power reflected
back to the klystron. These samples are fed to the embedded
controller where this information is used in process control as well
as system protection.
System control will prevent damage to the klystron from the
excessive reflected power by reducing or removing the RF drive to
it. System control also shuts off the klystrom beam power supply
for a klystron arc-event.
The WR-430 waveguide is typically brought out through the top,
right of the cabinet, but custom configurations are available.
CPI will assist with or execute most all aspects of system design,
development and implementation, including such areas as process
development, applicators, heat exchangers, wavguide transmission
systems, and other factors required to assure a successful system.
For assistance, contact CPI Industrial Microwave Systems
Application Engineering with your system requirements.
Telephone (978)922-6000; Fax (978)922-8914;
e-mail: [email protected]
Page 2 of 2
VIS-102B (March 15, 2006)
Communications & Power Industries, Inc., Beverly Microwave Division, 150 Sohier Rd., Beverly, MA 01915-5595, Tel 978-922-6000