ABB AMVAC Technical Manual page 7

The electronic controller uses robust components and circuit board con-
forming coatings to prolong the life of the device. The electronic con-
troller will operate on AC or DC control power because it utilizes an AC
to DC converter internally. Instead of selecting from a long list of con-
trol power options, the user only needs to select a controller for low volt-
age control power (24-60 VAC or VDC) or a controller for high voltage
control power (110-250 VAC or VDC). Inside these ranges, the user may
apply any value of direct current, or any value of 50 or 60 cycle alternat-
ing current to achieve circuit breaker operation. The electronic controller
incorporates all capacitor charging, open/close coil switching, anti-pump-
ing, interlocking, and armature position details. Self-monitoring functions
are programmed to monitor proximity sensors, the microprocessor, and
other key functions with annunciation and/or circuit breaker opening pos-
sible. Radio frequency and transient testing has been performed on the
electronic controller to ensure that it is resistant to such abnormal condi-
tions. The electronic controller demands up to four amperes continuous,
10 amperes peak during capacitor charging; only four watts of energy is
needed to maintain controller functions and capacitor full charge.
AMVAC. Circuit-breaker of
the high tech generation.
Proximity sensors
provide highly reliable
armature position
information to the
electronic controller.
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