SC722B-001 Pneumatic Servo Driver

Description

SC722B-001 Pneumatic Servo Driver

SC722B-001 Pneumatic Servo Driver

INPUT POWER FEATURES

Each SC720 model is a stand-alone, 4-quadrant controller equipped with an internal power supply and shunt regulator. Separate AC inputs are provided for control logic and bus power. The control logic can be powered while power is removed from the motor, placing the motor in a safe state while preventing loss of encoder or fault information. Control logic power can be 90-264 Vac single phase. Bus power can be 120 Vac single phase or 240 Vac single or three phase on the SC722 and SC723 and is 240 Vac three phase on the SC724, SC725 and SC726.

SINGLE RESOLVER FEEDBACK

The SC720 Series uses a single frameless resolver mounted on the motor shaft for rugged, reliable feedback. The resolver provides all necessary feedback information for commutation, velocity and position control. Position feedback information from the resolver is processed by the drive electronics to produce signals which emulate an incremental encoder. These quadrature encoder output signals are available for use by an external position controller, including PLC servo modules. The outputs are differential line drivers and have selectable resolution of up to 1024 pulses per revolution (4096 PPR optional). Pacific Scientific offers resolver equipped, brushless rare earth and ferrite magnet servo motors ideal for use with the SC720.

Compensation potentiometers for:
– velocity offset
– command gain
– loop gain
– current limit

Functional effects
The main control system for turbine boiler coordination: 1 is the frequency, 2 is the power command of middle note, 3 is the operator command, 4 is the power trend, 5 is the pressure setting, 6 is the pressure trend, 7 is the speed level pressure, 8 is the actual pressure, and 9 is the actual power. Its main function is to coordinate the action of the turbine and boiler, meet the load requirements, mainly including: ① load command processing circuit; ② The main controller of the boiler and turbine is implemented in a decentralized manner on both sides of the boiler and turbine. The boiler side main controller processes the switching of CCS working mode auxiliary RB signals, load locking, and the formation of fuel instructions for the boiler in various modes. The machine side main controller processes the formation of power setting values, pressure setting values, and corresponding operating mode steam turbine valve opening instructions. The signal between the two is completed through hardwired loop communication. The main controller of the machine and furnace is the core of the coordinated main control system, whose task is to complete the conversion of control methods and achieve load and pressure regulation. Figure 3 shows the schematic diagram of the coordinated control system.

Practical application of a certain power plant
A power plant unit adopts a coordinated control method based on machine and boiler, achieving automatic generation control of the unit. When the unit operates in CTF mode, the boiler main control and turbine main control (DEH) systems are in automatic power regulation mode (see Figure 4). The boiler controller and turbine controller are connected through nonlinear function converters F2 (X) and F3 (x), whose function is to convert the power deviation signal into a bias signal for the pressure setting during dynamic and steady-state processes.

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