SJDB-XTB three-phase alternating-current electromotor comprehensive
protector (hereinafter referred to as the protector) is an
intelligent controller which is designed specially for a
three-phase synchronous electromotor, a single chip microcomputer
is adopted as a main control element, the digital processing and
control technology is applied to the protector, the protector has
the advantages of being high in speed, high in precision, strong in
control function and the like, and the man-machine interactive
operation is more convenient due to the adoption of Nixie tube
display and buttons.
1, the protector has the functions of phase loss, phase current
imbalance, overload, overvoltage, undervoltage failure protection
and state self-locking.
2, The protector has the functions of setting, displaying and
storing electromotor rated currents, overload protection delay
time, phase current balance degree percentage protection values,
self-starting delay time, overvoltage protection values,
overvoltage protection delay, undervoltage protection values,
undervoltage protection delay and time value control parameters of
each stroke cycle.
3, the controller has the functions of automatic and manual
starting and switching and delay self-starting.
4, the controller has the functions of displaying three-phase
running current values, power source voltages, last-time failure
reasons and pumping unit balance weight balance degree.