 |
На главную страницу \ Master controller of electric actuator
The controller is designed for local and remote control as well as for protection of the electric actuator and the valves.
Main Functions:
- noncontact (thyristor) reversive turn-on and turn-off of the electric actuator;
- control over power supply on each phase (3 built-in voltage transformers), moreover, if any 2 phases fail the electric actuator controller has the same capacities and protects the electric motor;
- measurement of the opening stage in percentage;
- continuous current control over the electric motor (when there are 3 built-in current transformers);
- void-free closing of the valve gate and automatic stop of the electric actuator when the valve gate reaches the extreme position;
- communication by means of RS-485 (Modbus) with the device (PC) for control, regulation, changing of the settings and modes;
- ability to change modes both from distance (by RS-485) and manually, immediately from the module.
Operating Modes:
- manual (turn-on/turn-off of the electric motor is carried out with power supply to the winding directly from the electric actuator controller);
- remote (turn-on/turn-off of the electric motor is carried out with a signal transmitted through the control line);
- mechanical (turn-on/turn-off of the electric motor is carried out with signals from the inside switches module).
The module accepts the following control signals:
- signal from the opening limit switch;
- signal from the closing limit switch;
- signal from the opening coupling switch;
- signal from the opening coupling switch;
- automatic (instead of coupling switches signals from the electric actuator itself are used for control)
The module registers current inrush for the electric motor. The moment the valve gate begins to move the module starts the timer which measures the time of the valve gate movement. In case the inrush occurrence coincides with the time set for opening/closing of the gate valve the module senses that the extreme position is reached and stops the electric motor. When the valve gate jams emergency turn-off of the electric motor takes place if the current inrush was made before the elapse of the time set for closing/opening and the duration of the inrush exceeds the time set for protection system actuation in case of overload.
Functional Capabilities:
Turn-on of the opening mode of the electric actuator, turn-on of the closing mode of the electric actuator by means of
- buttons on the local control board;
- buttons on the remote control board;
- signals of the control computer.
Turn-off of the electric actuator:
- by means of buttons on the local control board;;
- by means of buttons on the remote control board;
- by means of signals of the control computer;
- on actuation of the position switch;
- on actuation of the torque switch
- when no movement occurs within the set time;
- when the set current magnitude is exceeded at the set interval of time;
- when phase retardation occurs;
- when phase deformation occurs;
Data about the condition of the electric actuator is transmitted into the automatic process control system (SCADA system). Data on the condition of the switches, current magnitudes, voltage in phases is transmitted through the digital communication channel (interface RS-485, protocol MODBUS).
Diagnostics of the electric actuator and the valves.
The controller setup is carried out with the help of computer, the user can choose:
- schematic diagram for turn-off of the electric actuator;
- current threshold for turn-off of the electric actuator;
- time intervals;
- list of parameters transmitted into SCADA.
Nonvolatile saving of the settings.
Ссылки
|
 |
