TechNote 413 - Valco Instrument Instrument Company
Contents
1. a minimum of 30 msec and deasserted turned off foraminimum F 2 PNS of 30 msec before the next assertion PE 3 Mode 2 a CABLE I 22537 Operation in this mode requires one relay In mode 2 asserting EER pin 5 causes the actuator to toggle from the current to the oppo Toggle setup A gt B gt A SS PIN1 S site position Asserting pin 6 causes the actuator to toggle to the actay E opposite position delay for a preset period of time the default is om 100 ms and toggle back to the original position 6 o PINS c CABLE l 22537 i Mode Setup Delay setup A B To set the actuator mode connect it to an RS 232 serial portas perav described in the section below Establishing Serial o Communications To see the current setting enter the SM GABLEN command as shown in the Serial Commands chart on page 5 To change the mode enter SMn where nis 1 or 2 The DT command displays the current delay time setting This setting can be changed with the DTn command where n is the desired time from 0 to 65 000 milliseconds Mode settings are saved when the power is off PIN1 o PING A Serial Control of the Actuator Establishing Serial Communications Items required e Valco cable assembly l 22697 or equivalent Terminal emulation or communication software such as QModem ProComm or Windows Terminal or HyperTerminal running on a PC compatible computer 1 Connect the l 2262. CONNECTOR _ FEMALE _ a l Figure 1 Actuator and controller connections Mounting OK The actuator should be oriented so that any potential leakage of liquid oe from the valve or fittings flows away from rather than into the actuator i i below Figure 2 provides the mounting dimensions for the stepper mo _ tor gearbox assembly f 1 95 gt lt 3 24 gt 3 4 for EH it B i d kn p 27 A A L VW O 2 2 1 T 9 f SERIAL p Q 3 1 NUMBER t i F azar TAG a a 4 J y l V 10 O H __ I Y i ail 8 32 CONTROL MODULE MOUNTING HOLES O O The length of the 8 32 screws used for panel mounting is not critical as long as they extend C at least 1 4 into the actuator casting a Figure 2 Initialization Any time a valve is removed and reinstalled the actuator must be initialized by following these steps 1 Cycle the actuator twice with no valve or with either end of the motor driver output cable unplugged 2 Plug the cable back in or put the valve back in the clamp ring Orient the valve as desired and tighten the clamp screw For the next few cycles the actuator will move at half its normal speed while it looks for the valve stops Once it determines the proper stroke the actuator will return to normal speed If you don t hear a change in s
3. W 17600 ci A OPTIONAL INPUT POWER CABLE TO BLACK WHITE STRIPE eee EXTERNAL 424 28 VDC CONTROL SYSTEM cai GND BLACK DIGITAL INPUT OUTPUT CABLE P N l 22537 MOTOR DRIVER OUTPUT CABLE P N 1 22645 Ppa si MOTOR GEARBOX 4 Ly a PIN 1 ASSEMBLY P N EQMA Highest speed EHMA High speed and Medium torque Ld MANUAL EDMA High torque i gt Z CONTROLLER ETMA Highest torque F Use optional P N 1 22689 MOUNTING PIN 4 20000 UJ UJ BRACKET 9 B P N l 22596 m A A Valco Instruments Co Inc POSITION POSITION A B 2 POSITION ACTUATOR CONTROL MODULE position EN PIN 4 00000000 Ss S CLAMP EQCA CE Highest speed CLAMP RING A B EHCA CE High speed sew O H EPCA CE Medium torque EDCA CE High torque ETCA CE Highest torque Lo POSITION ne2a INDICATOR 0000000000 LIGHTS OOO PIN 1 PIN 1 es A MANUAL CONTROLLER CABLE P N 22537 01 OPTIONAL SERIAL PORT SS RS 232 CABLE z P N 22697 t a E TOCOMPUTER M pB 9 lt
4. 97 cable to the actuator as indicated in Figure 1 and set the serial port at 9600 baud no parity 8 data bits 1 stop bit no hardware or software handshaking 2 With the software running check the bi directional communication link between the keyboard moni tor of the computer and the serial port by typing VR lt enter gt If the link is functioning and an actuator ID has not been set a message similar to the following will appear on your monitor giving the program number and date of the actuator firmware l PD ETX88RXX XX revision number 2 Aug 99 If there is no response it is possible that the ID has already been set To force a response from a device with an unknown ID type VR lt enter gt The asterisk is a substitute ID wild card which will elicit a response from all devices on line no matter what their ID is Programmer s note To permit multiple actuators to share the same computer serial port the actuator serial port output is deactivated when not in use At the beginning of a message the first character transmitted is sometimes lost due to a framing error To avoid this a NULL character zero value byte is sent at the beginning of each message Most terminal programs will ignore the NULL character but custom software may require a character trap to delete it Serial Communication Protocol Serial Port RS 232 Cable Signal Description Serial communication is based on an ASCII string protocol Carriage re turn OD
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6. Technical Note 413 Two Position Microelectric Valve Actuator Control module serial numbers starting with EM2C The microelectric actuator consists of a control module a stepper motor 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 actuator is self adjusting from 30 to 90 no valve alignment is necessary Once a valve is installed by tightening the clamp screw the actuator senses the positive stops within the valve and memorizes them in the first four moves ET The time it takes a valve to cycle from Position A to Position B z depends on the amount of rotation involved To determine the 36 60 70 90 140 390 number of degrees in the angle of rotation divide 360 by the number of ports in the valve Then consult the table at right 60 85110 150 235 500 20 15 148 235 300710 Switching times in milliseconds Installation and Use Getting Started Figure 1 on the next page shows how to connect the various actuator components There are four connectors on the control module keyed and sized to prevent incorrect connection Cable and Connector Functions Pin Signa Description Input power 20 30 VDC with 24 28 VDC preferred is supplied through a coaxial connector the inner pin is voltage and the outer pin is _ Input Power Cable ground The average DC current requi
7. already set If there is still no response check the cabling and connections 3 To set an ID type IDn lt enter gt where n is the new ID from 0 to 9 To change an ID type iIDn lt enter gt where is the current ID and nis the new ID To disable the ID feature type ID lt enter gt where i is the current ID Setting a New Baud Rate To permanently set a new baud rate for the actuator 1 Establish communications with the actuator at the current baud rate 2 Issue the command SBnnnn to temporarily change the baud rate to the desired rate If the power goes down at this point the baud rate will revert to the last permanent setting 3 Change the host computer to the same baud rate just set in the actuator and verify that you can establish communications 4 Re issue the same SBnnnn command you did previously in Step 2 and the current baud will be made permanent RS 485 Option Software The RS 485 option involves three minor software adapta tions to the RS 232 protocol The first is that the ID range is extended to include the characters A through Z with upper and lower cases treated as the same ID The second Figure 3 Control module change is that the ID is required either numbers from 0 to 9 or letters from A to Z and must be included in all commands The factory set default ID for all devices is Z The third adaptation is that all commands must include a forward slash as the start of message
8. character JUMPERS 1 AND 2 Cac e000000000 Hardware The RS 485 hardware includes two 3 pin connectors Figure 3 used as in out connectors for easy daisy chaining of additional devices Wired in parallel the signal assignments are as follows Pin 1 is Ground Pin 2 is Phase B and Pin 3 is Phase A The four male pins in a vertical row to the left of these connectors are jumper headers used to add or remove terminating resistors from the communication lines The top two and the bottom two should be jumpered when term ination is required The RS 485 hardware specifications require termination at each end of the communication line so in a daisy chaining application the jumpers should be removed from all the intermediate devices The RS 485 port on the host computer or controlling device generally includes terminating resistors so only the actuator on the end of the communication string needs to have the jumpers installed North America South America and Australia Oceania contact Europe Asia and Africa contact TN 413 Rev 1 11 3 j Valco Instruments Co Inc VICI AG International P O Box 55603 Parkstrasse 2 Houston TX 77255 CH 6214 Schenkon Sales 800 367 8424 Switzerland Tech 713 688 9345 Phone 41 41 925 6200 Fax 713 688 8106 valco vici com Fax 41 41 925 6201 info vici ch Cheminert and VICI are registered trademarks of Valco Instruments
9. evice ID feature enabled the serial port output transmit line of the actuator is disabled high impedance Thus as many as ten actuators can be controlled from a single host serial port for a temporary multidrop application For permanent multidrop applications the RS 485 option is the factory recomended solution The table above describes and explains all the commands available Using the Device ID Feature Actuators are shipped from the factory with this feature disabled When it s enabled the actuator responds only to commands which begin with the correct ID prefix allowing up to 10 actuators to be controlled from one serial port A single command can be broadcast to all actuators by using an asterisk as the command prefix Note Any broadcast command which elicits a response from the serial port such as VR or ID1 will receive a combined and unintelligible response To set the ID of an actuator connect it to an RS 232 serial port as shown in Figure 1 on page 2 Caution When installing or replacing actuators on a shared serial port make sure that no two devices have been set to the same ID number 1 Remove all of the actuators from the serial daisy chain except the one for which you are setting the ID 2 Type VR lt enter gt You should get a response giving the firmware version indicating that serial communication with the actuator is established If there is no response type VR lt enter gt to see if the ID is
10. hex characters parse the communications by defining the end of each command Line feed characters OA hex are ignored A three pin connector is used for the RS 232 interface pin assignments are indicated at right Software flow control Xon Xoff and hardware hand shaking are not supported Serial Commands delay time then rotates back to the original position ID lt enter gt Displays the current device ID setting IDn lt enter gt Sets the device ID to value n from 0 to 9 NOTE When the ID feature is enabled all commands to the device must be prefaced by the ID number Entering ID disables this feature discussed below ID lt enter gt Clears the ID variable SB lt enter gt Displays the current baud rate SBnnnn lt enter gt Sets the baud rate to 1200 2400 4800 9600 default 14400 19200 28800 or 38400 The parity setting number of data bits and number of stop bits cannot be changed See section entitled Setting a New Baud Rate on the next page SOnnnn lt enter gt Turns off the position outputs after a delay set in milliseconds to the closest 5 ms interval from 0 to 30 000 ms The outputs are always on SO 0 by default SM lt enter gt Displays the current digital input mode See section entitled Digital Control of the Actuator subhead Input Modes NOTE The total delay time equals n 2 milliseconds Displays list of valid commands Starts a re inialization sequence With the software settable d
11. peed make sure that the clamp screw is tight Digital Control of the Actuator Digital Communication Protocol Pin Signal Description Pins 1 and 2 provide ground and 5 volt outputs respectively pins 3 and 4 are TTL outputs for Position A and Position B and are considered asserted at 0 volts and deasserted at 5 volts This is sometimes re ferred to as negative true logic Pins 5 and 6 are digital inputs for ane switching to Position A and Position B They can be driven either by 5 volt TTL CMOS logic or by contact closure to ground Pin 1 Isolated con e Postne tact closure outputs are available at Pins 7 and 8 for Position A and Pins EA on ila 9 and 10 for Position B If there is a positioning error due to valve stick 8 Postion A relay contact output ing clamp ring slippage etc the output is set to 0 all lines high for a 9 Position B relay contact output_ Position B relay contact output negative true output Input Modes Two input mode options are provided to expand the control flexibility of the actuator Mode 1 In mode 1 default the digital inputs are set to be compatible with the standard Valco AC actuator Asserting input pin 5 causes the actuator to go to Position A and asserting input pin 6 sends it to Position B Operation in this mode requires two relays as shown in Mode 1 the illustration at right Relays should be asserted turned on for S PIN 1
12. rement is 2 5 amps Standby inner 20 30 VDC power current draw is 60 milliamps The actuator should not share a power elie supply with other noise sensitive electronics as the high current draw can cause problems Motor Driver Output Cable Pesos rases P Motor driver output is through the five pin connector pins 1 2 4 and 5 carry the stepper motor phase drive signals Pin 3 is grounded and tied to the cable shield to reduce electrical noise 1 2 3 4 rons Prass 5 Phase A A three pin connector is used for the RS 232 interface pin 1 is ground pin 2 is transmit to the host computer and pin 3 is receive from the host A discussion on serial control of the actuator starts on page 3 The ten pin connector is for the manual controller or for digital input output signals the actuator can be controlled by either or both The manual controller has a through port so an additional cable can provide simultaneous control by an external system Digital control of the actuator is discussed on page 3 Serial numbers are on the underside of the control module Figure 2 Actuators of this series obsoleted in 2010 are further identified by a metallic control module housing If your actuator control module has a plastic housing and a serial number starting with E2CA please refer to Technical Note 421 POWER SUPPLY TO 110 OR 220 VAC P N PS24VDC CE User must supply other LINE CORD IEC 320 line cord configurations P N I
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