J592S-450550 industrial control module card PLC/DCS spare parts

J592S-450550 industrial control module card PLC/DCS spare parts

Technical data of product parameters

Many synchronous machines are subject to severe vibration J592S-450550
when operating at speeds other than rated speed.
Vibration is particularly pronounced when underspeeding, but
can occur both at under and overspeed. For this reason, a frequency scheme will usually include two stages for alarm and
tripping at overspeed and two stages for alarm and tripping at
underspeed. A time delay confines the danger of false tripping
during transients.The rate-of-change of frequency function only trips when the
rate-of-change is higher than setting, the absolute frequency
criterion picks up and the voltage is not lower than the
undervoltage setting. J592S-450550
The additional absolute frequency criterion prevents unwanted
operation of the rate-of-change function during power system
transients. Where it is desired that the rate-of-change function
should operate without regard to the absolute frequency, this is
achieved by setting the absolute frequency criterion to ‘0The overfluxing function is primarily intended to protect the iron
cores of power transformers. Tripping by the function is delayed
to avoid false operation during system transients such as load
shedding. J592S-450550
The magnetic flux is not measured directly. Instead the voltage/frequency ratio, which is proportional to the flux and easier
to measure, is monitored.
Overfluxing can result from either an increase of system voltage
or a reduction of system frequency.
For example, 10 % overfluxing at constant frequency is equivalent to increasing the value of the U/f ratio to 1.1 UN/fNThe overfluxing function protects the iron cores of generators
and power transformers against excessive flux.
The magnetic flux is not measured directly. Instead the voltage/frequency ratio, which is proportional to the flux and easier
to measure, is monitored.
Overfluxing can result from either an increase of system voltage
or a reduction of system frequency.
For example, 10 % overfluxing at constant frequency is equivalent to increasing the value of the V/f ratio to 1.1 UN/fN.
The limit curve for the maximum magnetic flux (V/f) permissible
for electrical machines is defined

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Focus on DCS, PLC, robot control system and large servo system.

Main products: various modules/cards, controllers, touch screens, servo drives.

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This article from the temporal Ming sheng automation equipment co., LTD.,

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