Automatic synchronizer control device based on distributed control system
A distributed control system and automatic control device technology, applied in pump control, machine/engine, liquid variable capacity machinery, etc., can solve problems such as difficulty in finding motors, inability to match couplings, inability to directly realize AC motor control functions, etc. , to achieve the effect of improving safety, saving cost, and effective and reliable device
Active Publication Date: 2012-04-04
SHANGHAI GAOQIAO SGPEC PETROCHEM ENG & CONSTR
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Problems solved by technology
In this regard, the old DCS control system (distributed control system) of Hollysys Control Co., Ltd. used in the deaeration system of the pump cannot directly realize the control function of this AC motor; the control system and clamps are added to the existing cabinet. It cannot be done; if it is changed to DC motor control, it is difficult to find a matching motor, and the motor modification cannot be equipped with a coupling due to on-site space problems, and the most important thing is that there is no DC power supply on site, so it is difficult to implement a synchronizer motor. automatic control of
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[0020] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0021] In the steam-operated feedwater pump synchronizer of the deoxygenation system for the pump, the speed-regulating motor is an AC single-phase asynchronous motor; the synchronizer automatic control device based on the distributed control system of the present invention, the working coil of the synchronizer motor The application of AC power on Q1, and the switching of live wire and neutral wire on the control coil Q2 are automatically controlled.
[0022] When realizing the speed regulation function, in the automatic control device of the synchronizer, a load-reducing button and a load-increasing button are set to send corresponding control commands; wherein, when the load-reducing button starts, three secondary signals can be sent: CHDOBY16, CHDOBY17, CHDOBY18, set these three signals in the button properties as a group of load reduction comman...
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The invention relates to an automatic synchronizer control device based on a distributed control system. When load of a speed regulating motor is increased and reduced, one end of a working coil is connected with a firing line of an alternating current power supply through a fourth or first relay, and the other end of the working coil is directly connected with a zero line of the power supply. One end of a control coil is connected with the firing line through a second relay and the first relay, and the other end of the control coil is connected with the zero line of the power supply through a third relay so as to reduce load; or one end of the control coil is connected with the zero line of the power supply through a sixth relay and the other end of the control coil is connected with the firing line of the power supply through a fifth relay and the fourth relay so as to increase load. Therefore, the working coil is only electrified in the processes of increasing and reducing load; moreover, when the load of the control coil is increased and reduced, the firing line and the zero line can be switched, the automatic control over a synchronizer speed regulating motor is realized, the device is effective and reliable, the safety of a steam feed pump is improved, and cost of operation workers is greatly reduced.
Description
technical field [0001] The invention relates to a synchronizer automatic control device, in particular to a synchronizer automatic control device based on a distributed control system. Background technique [0002] At present, there is no automatic adjustment method for the synchronizer of the steam-driven feed water pump. The steam-driven feed water pump cannot be controlled remotely, and the speed control of the synchronizer must be performed locally. This will not only greatly affect the adjustment efficiency, but may also cause accidents. [0003] For example, in an accident, the duty officer in the pump panel found that the speed of the steam-driven feed pump dropped from 3021 rpm to 2940 rpm, the water supply pressure dropped (the lowest speed was around 2700), and the bearing oil pressure swayed by 0.11 to 0.13 MPa. At that time, the field operator was notified to go to the site for inspection and found that the steam-driven feed pump vibrated greatly, the automatic m...
Claims
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Inventor 赵森
Owner SHANGHAI GAOQIAO SGPEC PETROCHEM ENG & CONSTR