1-6
Each component is described in the following table.
Name Description
Main unit (also “Body”) • Houses the electronics module, EPM (electro-pneumatic module), and
VTD (position sensor).
Pilot relay • Amplifies the pneumatic signal from the EPM (electro-pneumatic
module) and converts it to a pneumatic signal for the actuator.
Feedback lever • Receives the motion of the control valve lift and transmits it to the
VTD (position sensor).
A/M switch • Switches the output air control method between the automatic
operation state and the manual operation state. See 5.2 for information
on operating procedures.
External zero/span
adjustment switch
• Enables the zero and span to be adjusted and auto setup to be
performed with just a flat-blade screwdriver, without using a setup
device.
Supply air pressure gauge • Indicates the pressure of the supplied air.
Output air pressure gauge • Indicates the pressure of the output air.
Supply air connection • The air supply goes to this connection.
• Labeled “SUP.”
Output air connection • The output air is delivered from this connection to the actuator.
• Labeled “OUT.”
Mounting plate (optional) • Used to mount the device on the actuator.
• Its shape differs depending on the specifications (the actuator type).
Reversing relay • Used when a double-acting actuator is used.
The reversing relay is added at the output connection of the device.
The reversing relay provides two outputs: output air pressure
1 (OUT1), which is the device's output air pressure without
modification, and output air pressure 2 (OUT2), which is the output
air pressure resulting when the air pressure supplied to OUT1 is
subtracted from the reversing relay (SUP). Connecting these outputs
to the two cylinder chambers of the double-acting cylinder allows the
cylinder to function as a double-acting actuator.
Output air connection
(OUT1)
• The output air is delivered from this connection to the actuator.
• “O1” is stamped on the lower section of the reversing relay.
Output air connection
(OUT2)
• The output air is delivered from this connection to the actuator.
• “O2” is stamped on the lower section of the reversing relay.
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