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Technical Note 415

Valco Instruments Co. Inc.

Multiposition

Microelectric Valve Actuators

Models EMH and EMT

The microelectric multiposition actuator consists of a control module, a steppermotor/gearbox assembly,

a manual controller (use is optional), a universal AC input (100-240 VAC, 50-60 Hz) to 24 VDC power

supply, and the interconnecting cables.

The time it takes to step a valve from one position to another depends upon the actuator model, the

number of positions for which the actuator is set, and the total amount of rotation involved. Actual

times can be computed from the tables below.

NOTE: With the exception of Valco P type valves (which have a visible coil spring), all our multiposi-

tion valves are keyed to provide automatic alignment on a microelectric actuator. However, not all

standoffs (an extension which holds the valve away from the actuator) are keyed. Therefore, if you

are ordering components separately or retroﬁtting a valve and actuator with a standoff, make sure you

specify a keyed standoff so that you can take full advantage of the ease of alignment provided by a

keyed standoff, microelectric actuator, and valve.

Installation and Use

Getting Started

Figure 1 on the next page shows the functions of the cables supplied with the actuator. There are four

connectors on the control module, keyed and sized to prevent incorrect connection.

Number of

positions

set





































Time req.

to move

one position

Time per

additional

position

EMH

(

high speed

)

actuator

























Number of

positions

set













Time req.

to move

one position

Time per

additional

position

EMT

(

high torque

)

actuator

1 2 3 4 5 6 7 8 9

Resumo do Conteúdo

Página 1 - Microelectric Valve Actuators

1Technical Note 415 Valco Instruments Co. Inc.Multiposition Microelectric Valve ActuatorsModels EMH and EMTThe microelectric multiposition actuator co

Página 2 - CONTROL MODULE

2MULTIPOSITION ACTUATORCONTROL MODULEPOSITIONROTATIONSTEP HOMEPUSH BOTH BUTTONSSIMULTANEOUSLYTO REVERSE DIRECTIONVALVECLAMPSCREWCLAMPRINGMOTOR/GEARBOX

Página 3 - Mounting

3Cable and Connector FunctionsInput power (20 – 30 VDC, with 24 – 28 VDC preferred) is supplied through a miniature power connec-tor: the inner pin is

Página 4 - Digital Protocols

4Simultaneous Use of the Manual Controller and an External Control SystemThe manual controller has two identical connectors for input and/or output, p

Página 5 - Code sequence break

5Pin signal definitions for the Digital Input/Output cableSignalHomeMotor runStepErrorManual Dir.DirectionAuto Dir.Data latch+5 VDC 100 maGround80 BCD

Página 6 - only 8 positions:

6Serial Control of the ActuatorEstablishing Serial CommunicationsItems required:• Valco cable assembly I-22697 or equivalent• Terminal emulation or co

Página 7 - beginning on the next page.)

7Serial CommandsNP<enter> Displays the number of positions the actuator is currently set to indexNPnn<enter> Sets the number of positions

Página 8 - Serial Communication Protocol

8Serial Communication ProtocolSerial communication is based on an ASCII string protocol. Carriagereturn (OD hex) characters parse the communications

Página 9 - Figure 4: Control module

   

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