Term descriptions for electric actuators2020.09.01
The following is an explanation of the terms used for electric actuators that appear in specifications and catalogs.
Meaning of the model name
The last three digits following the series name of the rotary motion model indicate the estimated rated torque.
For example, AE1-120 indicates that the torque rating is 12N-m.
Note: Some models are exceptions to this rule.
The last three digits following the series name of a linear motion model indicate the approximate rated torque.
For example, LAX-030 indicates that the rated thrust is 300N.
A model listed with "100/110 V AC" can be used with both voltages.
A model listed with "100 to 240 V AC" can be used with the voltage within the range.
DC powered models are available with battery or full-wave rectified DC power.
Note: CD2/CMX/PEX/ABR/HBR/PBX cannot use full-wave rectified power supply.
The figure shows the load torque of a rotary motion actuator that can be safely used for a long period of time under the operating conditions specified by us. It is different from the maximum output torque actually generated by the actuator.
The actuator may be damaged if it is used under conditions that exceed the rated torque (overload) due to biting of foreign objects, etc.
The figure shows the load thrust of a linear motion actuator that can be safely used for a long period of time under the operating conditions specified by us. It is different from the maximum output thrust actually generated by the actuator.
The actuator may be damaged if it is used under conditions that exceed the rated thrust (overload) due to biting of foreign objects, etc.
The operation time varies depending on the frequency of the power supply of the electric actuator using the synchronous motor or the reversible motor.
Operating time of the electric actuator using the DC motor varies depending on load of the valve and voltage fluctuation.
In our homepage, the time when the actuator output shaft rotates by 90 degree is indicated.
Actually it will change due to looseness of connecting parts and adjustment of valve opening / closing position.
It represents the length of the linear motion actuators output shaft moving in one second.
Since a synchronous motor is used, the opening/closing time varies depending on the power supply frequency (50/60Hz).
It represents the operating range of the output shaft that the linear motion actuator can use. It varies depending on the valve to which it is attached.
Electric actuators consume almost no power while they are stopped.
The power consumption described is a numerical value during motor operation.
Power consumption is expressed in (VA). The current value (A) required for operation can be calculated by dividing the power consumption (VA) by the voltage (V).
The power consumption of actuators with DC motors varies depending on the valve load. In this catalog, the power consumption at rated load is indicated.
When the load abnormally increases, the internal resistance is increased by the self-heating of the thermistor, the current to the motor is restricted, and excessive temperature rise is prevented. After cut off the power to the actuator, it recovers when the temperature of the thermistor decreases.
Thermal protector type
When the load abnormally increases, the internal bimetal works due to self-heating of the motor and cuts off power to the motor. After cut off the power to the actuator, it recovers when the temperature of the motor decreases.
Impedance protect type
A motor with a structure that does not increase the current value and temperature more than a certain amount even if the load abnormally increases due to the winding with a large resistance value is used.
Current limiter type
If the load abnormally increases and the current flowing to the motor becomes equal to or greater than the set value, the control circuit detects and shuts off the current to the motor. It recover with cutting of power to the actuator or operation in the reverse direction.
When the motor continues to drive beyond the set time, the timer circuit detects and cut off power to the motor. It recover with cutting of power to the actuator or operation in the reverse direction.
If motor protection works, check the valve condition, as there is a high possibility that an abnormality has occurred in the valve.
As seen from the top of the actuator, the rotary actuator is closed (In three-way valve position 1) with the output shaft rotating in the clockwise direction.
Open (In three-way valve position 2) with counterclockwise rotation.
The linear motion actuator closes when the output shaft extends (lower end). Shrinking (upper end) will be opened.
Operation of Emergency shut-off actuator
This section explains the emergency operation of the emergency shut-off actuator.
In the standard setting of ECR series and ABR/HBR series, the actuator will operate until the operating switch is in the OFF position. (In mode A, the switch will be in the closed position (1).
The ABR/HBR series can be set to "Standby mode" which does not operate immediately upon loss of power, but can be operated by inputting the operating switch.
In the standby mode, you can select either "Operate to OFF position" or "Exit in the current position" when the battery voltage is at the limit.
Power transfer input type
Switch power supply to S or O terminal (Cabtyre cord model is white or red wire) to energize, open and close the valve.
In this type, the current for the motor is applied to the operation switch.
Please use the switch of capacity necessary for motor operation. Open / close signal is output with input voltage.
a-contact input type
Operate the actuator with signal relay for 1a contact.
It is suitable for P.L.C. which uses a current signal of a minute load. The open / close signal circuit is a dry contact, and it can be used with other voltage than the input voltage.
(CD2 / CM2 / DM2 type is output with the input voltage.)
Switching polarity type
Activating the actuator when changing the polarity of the DC power supply.
The electronic positioner is built-in and the signal of the controller is directly input to the actuator.
It controls the valve to an opening proportional to the input signal.
Please note that the type of input signal that can be used depends on the series.
The indication signal is output at 0 - 1 mA. (CMX excluded)
Override switch (For proportional control)
It operates with priority over the input signal.
Even with an actuator with a speed control function, it will be the fastest operation.
In a proportional control actuator, this indicates the accuracy with which the motor responds to changes in the input signal.
For an actuator with a resolution of 0.2% or less, if the input signal is 4-20mA, the motor will respond to a signal change of 0.2% of 16mA, which is the operating range, = 0.032mA or less.
Input signal current
This is the current value that flows through an operating switch or relay used for an actuator with an a-contact signal input control system.
Output signal rating
This is the contact capacity of the built-in microswitches and relays used for signal output.
The position angle of the proportional control actuator is output at 0-1 mA DC.
Changing the operating mode to B does not change the opening angle output (the same as in mode A).
When the EI option is selected, a 4-20 mA opening signal isolated from the input signal can be output. (AEX, PEX, PDX, PHX, PBX)
This function provides a dry contact output when the motor protection circuit is activated.
AE2, AD2/0, PHR, ECR, ABR, and HBR series electric actuators are equipped with this function as standard.
Proportional control actuators (AEX, PEX, PDX, PHX, PBX) are also available with EA option.
Maximum time it can operate within a certain time. In the case of "20% 15 min", its 20% (= 3 minutes) operation is possible in 15 minutes. The frequency with which it can be operated can be calculated from the actuation time of the actuator.
Atmosphere temperature near the actuator. Even within this range, please be careful because it may not be usable due to direct sunlight, radiant heat from piping and peripheral equipment, heat transferred from valve etc.
This is the power consumption of the anti-dew condensation heater built into the actuator.
It operates while the motor is stopped with power on.
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