600 SERIES MANUAL
8
118118-001 Rev A
SECTION IV – CIRCUIT DESCRIPTION
4.1 FUNCTIONAL DESCRIPTION
The 602C, 603C, and 612C employ a standard
step-down transformer to obtain a nominal
+28Vdc from the input ac power. The Series
605C and 606C 28Vdc (+24Vdc for
+24V Option models) from the input ac power.
The circuit converts the +Vdc low voltage input
DC power to a high voltage DC output. This
output voltage is highly regulated and filtered and
can be varied either by the local potentiometer
control or through the REMOTE PROGRAM
input.
An oscillator determines the frequency
(approximately 20kHz) at which all
amplification, high voltage transformation,
rectification and filtering occurs. The
amplification is a function of a control voltage
which performs the function of control and
regulation. A sample of the output voltage is
compared against a reference voltage in the
sensing circuit. The sensing circuit generates
the control voltage to set and maintain a fixed
high voltage output.
The encapsulated high voltage assembly
includes a high voltage power transformer,
rectifier or multiplier circuits, ripple filter and
sensing circuits. These are all critical, custom
designed and encapsulated components.
SECTION V – MAINTENANCE
5.1 GENERAL
The high voltage power supply should not
require any maintenance or calibration. It is
designed for reliable, trouble free operation. If
any question should arise, contact the Bertan
Customer Service Department for assistance or
return authorization. Although it is felt that
adequate information is provided in this
manual, it is suggested that the unit be
returned to the factory is service should
become necessary.
The power supply can be returned to the
factory for annual calibration and certification to
its original specification. For traceability, a
certificate will be issued, identifying the serial
number of the unit calibrated and all test
equipment used to perform the calibration. All
measurements are traceable to the National
Institute of Standards and Technology
(N.I.S.T.). Contact the factory for additional
details.
5.2 CLEANING
Cleaning of the power supply should
only
be
performed with the supply disconnected from
the ac power source. A soft cloth moistened
with conventional ammonia-based cleaning
agents will suffice for all exposed surfaces. The
exposed shell of the HV connector should be
cleaned with isopropyl alcohol.
If the supply is operated in a dusty
environment, an accumulation of dust/debris
may build-up inside the unit which may cause
noisy operation (i.e., “ticking” or minor
crackling) in the area of the HV cabling on the
10kV through 30kV models. The safest way to
remove such debris is with compressed air.
Ensure that no dust/debris is left behind in the
insulative medium of the HV output connector
after this cleaning operation. Such dust may be
removed with a cotton swab moistened with
isopropyl alcohol.
