I. Introduction to SWD6-B Intelligent Variable Frequency Electric Actuator

1.1 Introduction to Purpose

1.1.1 SWD6-B series intelligent variable frequency electric actuators use AC power as the power source, accept standard analog 4mA~20mA DC signals or remote passive switch signals, and cooperate with appropriate mechanical transmission mechanisms to operate dampers, valves and other adjustment mechanisms to perform automatic adjustment tasks of industrial production process control systems.

1.1.2 The basic form of mechanical output of SWD6-B series intelligent variable frequency electric actuator is multi-turn. When it is combined with a linear thruster, it becomes a straight-stroke (linear) electric actuator. If it is combined with a worm gear reducer, it becomes an angular-stroke (partial-rotation) electric actuator. It can be used in conjunction with various forms of dampers and valves to complete various adjustment tasks.

1.1.3 SWD6-B series intelligent variable frequency electric actuators are suitable for automatic control systems such as DCS, PLC or remote manual control systems, and are widely used in production process control in industries such as power, metallurgy, chemical industry, building materials, and water treatment.

1.2 Main technical performance and structural characteristics

1.2.1 SWD6-B series intelligent variable frequency electric actuators adopt mechatronics technology with mechanical reducer and power control components, and additional electrical components are not required.

1.2.2 The electronic control device has integrated servo-release structure and is controlled by single-chip microcomputer. The power control uses new generation of frequency conversion module and control technology. The electronic control device is an independent component installed on the main box body. The electronic control device can be installed separately if needed.

1.2.3 The motor control adopts variable frequency control technology. It can not only realize flexible starting and flexible closing characteristics, but also set different motor starting and closing times according to different motor powers, reduce mechanical impact on the adjustment mechanism (valves, dampers), make the motor starting current less than its rated current, reduce the motor temperature rise, and extend the service life of the motor.

1.2.4 It has bidirectional over-torque protection function. The closing torque of the actuator can be set within the range of 30%〜120% of the maximum output torque, with a setting step of 10% and a total of 10 levels. Different torques can be set for the switch directions respectively, which can effectively protect the adjustment mechanism.

1.2.5 The speed of the actuator output shaft can be set. The adjustable range is 30%〜120% of the rated speed, 10% per level, with a total of 10 levels. Different speeds can be set for the switch direction.

1.2.6 It has local/remote switching function. In local mode, you can directly operate the keys on the panel or use the remote control to operate the actuator. In remote mode, it can directly accept 4mA~20mA standard analog signal or remote passive switch signal to realize remote automatic control.

1.2.7 The local operation key adopts magnetic sensitive technology. There are no connecting wires between the keys and the circuit board, and the control panel can be removed from the electric control box for convenient maintenance.

1.2.8 Double-layer display screen is adopted for local display. When working normally, it is displayed on the LCD color screen, which can display the valve opening, control mode, real-time torque and various alarm contents, etc. When the power is off, the LCD screen can display the valve opening.

1.2.9 Non-intrusive commissioning is adopted. For commissioning, you only need to follow the prompts on the display screen. The stroke setting and various parameter settings of the adjustment mechanism can be achieved through the operation keys. Commissioning is quick and easy.

1.2.10 Precision conductive plastic potentiometer or absolute encoder is adopted as position detection element, which features high accuracy, long service life and convenient repair and replacement.

1.2.11 SWD6-B series intelligent variable frequency electric actuators can be controlled by DC4mA~20mA standard analog signal, and can also be controlled by remote passive switch signal. The switch signal control is provided by the DC24V access power supply inside the electronic control device, and the control mode is selectable.

1.2.12 SWD6-B series intelligent variable frequency electric actuator has the emergency (ESD) switch signal input function. When the ESD signal is valid, the actuator will operate in the pre-set emergency (ESD) mode.
1.2.13 It has the function of signal failure protection. When the analog control signal is disconnected, the actuator will operate according to the set protection mode, remaining in place or running to the pre-set position.

1.2.14 It has bidirectional over-torque protection function. Whether to retry after over-torque protection and the number of retries can be set.

1.2.15 It has the protection function of motor overheating and displacement detection fault (mechanical jam).

1.2.16 It has the functions of fault self-diagnosis, self-protection and fault display.

1.2.17 It has the function of automatically correcting the motor rotating direction. The motor rotating direction is not related with the phase sequence of the power supply.

1.2.18 It has 7 kinds of state switch signal (relay normally open passive contact) output for the control system. These 7 states are: fully closing, fully opening, midway, local, over-torque closing, over-torque opening, and signal failure. The contact capacity is 220V/AC, 5A.

1.2.19 The reduction device adopts worm gear structure with self-locking function, which features compact structure and good performance.