Electric Actuators ÝÏ4 / EP4 of New Generation

The electric actuator ÝÏ4/EP4 is designed for remote and local control of stop, stop-regulating valves of multi-turn type and part-turn valves with additional gear, series ÝÏ5, application.

Electric actuator ÝÏ4/EP4 is equipped both with electronic microprocessor (smart) control module, or with mechanical module of limit switches containing counter mechanism potentiometric sensor for the output shaft position indication.

the Smart module have the following functions:
• electric actuator adjustment and control
• adjustment of
• reception and transmission of data (of relay control digital signals and analog signal of assignment of output shaft position, transmission of digital signals of limit and torque switches response, current signals of shaft position and torque magnitude, reception and transmission of data through interface unit RS485),
• blockage (backspacing inhibit without stopping for the given time, motor reclosure in the previous direction inhibit, inhibit of unapproved actuator parameters set, bypass (dropping) of torque limit excess signal on the initial segments of movements),
• protective switching off (in case of one or more power supply phases break, in case of torque accepted value access, in case of movement absence during given time, in case of given motor temperature access, in case of connection loss in remote control mode),
• indication (of extreme positions, fact and direction of rotation, output shaft current position and driving torque magnitude, operating mode, emergency situations, power supply),
• viewing of status variables, settings and functioning history of electric actuator,
• registration of overhead information and electric actuator functioning history information,
• temperature control of instrumentation module,
• settings saving and volatile following of output shaft position during emergency power supply switching off.

Local control board, situated at the front part of electric actuator, has:

• control functions switch (local/off/remote),
• multi-functional adjustment and local control buttons,
• liquid-crystal display,
• seven-segment light-emitting diode display,
• light-emitting diode displays,
• input/output of optical communication channel.

All optical elements of local control board are covered with impact-resistant glass. Buttons and operating modes switch are noncontact. Anti-vandal protection of the front panel of local control board is provided with tip-up metal lid.

Electric actuator ÝÏ4 can be delivered (according to order specification) in simplified version, which presupposes installation of mechanic instead of electronic control module, which represents microswitches unit, signalizing output shaft assigned positions reaching (two end and two intermediate positions), and reaching of limiting torque value to valves opening and closing direction.

Electric actuator has:

• level of protection from moisture and dust ingress IÐ67 (optionally IÐ68),
• oilful gear, which does nor require maintenance,
• specially designed motor with improved mechanical characteristics and advanced degree of protection from external actions and overloads,
• electric actuator embodiment meets requirements of implosion protection level 1Åõåd II ÂÒ4.

Electric actuator is connected with power supply and cable control system through three cable inlets, concentrated on electric actuator body in one place.

Electric actuator basic element is worm-and-wheel gear module, on which electric motor module with intermediate gear, handwheel module, control and power supply modules are installed.

Worm-and-wheel gear module has changeable output shaft and connecting flange for every electric actuator dimension. Thus, easy connection of electric actuator to valves with flanges and spindles (both of domestic standard ÎSÒ 26 07 763 73, and international standard ISO 5210, for example, to valves with such flanges and spindles as À, Á as per ÎSÒ 26 07 763 73 and such as F07, F10, F14 as per ISO 5210) is assured.

While using handwheel, electric motor is disconnected mechanically with electric actuator shaft and keeps still, this allows to use handwheel, for example, in case of electric motor seizure. Handwhell switches off automatically when electric motor switches

Possible combinations of electric actuator torques and shaft speeds are shown in the table.