Owner manual

ManualsBrandsVICI ManualsHardwareSelectors (multiposition) Standard electric

Valco Instruments Co. Inc.

MNL-MEA

Printed in USA

Multiposition

Electric Actuator

Instruction Manual

Valco Instruments Co. Inc.

800

367

8424 sales

713

688

9345 tech

713

688

8106 fax

valco@vici.com

VICI AG International

Schenkon, Switzerland

Int + 41

925

6200 phone

Int + 41

925

6201 fax

info@vici.ch

GENERAL DESCRIPTION ................................................................................... 1

MANUAL USE OF THE MULTIPOSITION VALVE ACTUATOR ............................ 2

CONTROLLING THE ACTUATOR WITH A COMPUTER....................................... 3

STEP and HOME Commands

Random Access with BCD Logic

ACTUATOR MODIFICATIONS .............................................................................. 7

Changing the Number of Positions (Indexing Angle)

Reversing the Direction of Rotation

VALVE ALIGNMENT ..........................................................................................12

Causes of Misalignment

Chromatographic Symptoms of Misalignment

Alignment Procedure

TECHNICAL DRAWINGS ....................................................................................17

WARRANTY ........................................................................................................30

Summary of content (32 pages)

PAGE 1
Valco Instruments Co. Inc. Multiposition Electric Actuator Instruction Manual GENERAL DESCRIPTION ................................................................................... 1 MANUAL USE OF THE MULTIPOSITION VALVE ACTUATOR ............................ 2 CONTROLLING THE ACTUATOR WITH A COMPUTER ....................................... 3 STEP and HOME Commands Random Access with BCD Logic ACTUATOR MODIFICATIONS ..............................................................................
PAGE 2
This page intentionally left blank, for printing purposes
PAGE 3
General Description Valco multiposition valves are used to select a flow from a number of different streams in gas and liquid chromatography and in process stream applications. Switching them to the desired position can be done manually, but is best done automatically with either a Valco multiposition air actuator or the random access Valco multiposition electric actuator described in this manual.
PAGE 4
Manual Use of the Multiposition Valve Actuator 1. Plug the electric actuator into a power outlet (110 VAC or 220 VAC, 50/60Hz, as required). The LED indicator light in the control box (Figure 1) will light up and indicate the position of the valve/actuator. 2. Press the control box toggle switch momentarily toward HOME. If the valve is in any position other than Position 1, it will go to HOME (Position 1). If the valve is in Position 1, it will not move.
PAGE 5
Controlling the Actuator with a Computer The first step in interfacing the Valco multiposition electric actuator to a computer or data system is to consult the user’s manual of the control device to determine what kind of outputs are available, and how many there are. There may be relays, open collector transistors, logic level signal outputs, or an RS-232 connector. (These are not cleanly delineated categories; for instance, BCD logic will involve one of the others.
PAGE 6
Controlling the Actuator with a Computer Random Access Logic Input For devices with an RS-232 connector, a simple solution is available in the form of the Valco Serial Valve Interface (SVI). The SVI is a self-contained unit, complete with software, that will convert commands from a computer into positional control for as many as two multiposition and four two position Valco electric actuators.
PAGE 7
Controlling the Actuator with a Computer �� To implement the BCD logic, attach the remote cable wires for the PRESET ENABLE, 1’s, 2’s, etc. to relays or transistor collectors. The white GROUND wire must go to a “common” point on the control device.
PAGE 8
Controlling the Actuator with a Computer 3. Refer to Drawing 22721 on page 19. Replacing integrated circuit U2 (a 4049) with a 4050 changes the output from negative true to positive true. (Order Valco Product No. I-IC4050.) 4. Reinstall the board in the cover and reassemble the actuator and cover, making sure that all the wires and cables are reconnected to the Encoder Board assembly.
PAGE 9
Actuator Modifications Situations occasionally arise when it is desirable to alter an actuator so that the indexing angle is changed, such as when changing from a 6 position to an 8 position valve. Or it may be helpful when changing from air to electric actuation to reverse the rotation so that it will go the same direction as the air actuator. These modifications can be accomplished by following the procedures below.
PAGE 10
Actuator Modifications �� 4. Disconnect the motor from the board. (Refer to Drawing No. 22835 on page 29.) 5. Loosen but do not remove the two 8-32 x 1-1/4" hex head (9/64) screws which hold the boards to the gearbox.
PAGE 11
Actuator Modifications Description of the Encoder Discs �� The encoder disc provides a means �� of signalling the position of the �� actuator and relaying that information to the logic circuit. If the disc is thought of as consisting of five �� concentric bands, (like an archery �� target) the outside band contains � �� the “strobe bits.
PAGE 12
10 Actuator Modifications Reassembly 1. Using Figure 8 and the preceding description, identify the slot on the replacement encoder disc which determines Position 1. With the motor toward you and the casting away, install the new encoder disc oriented as in Figure 8, with the strobe bit of Position 1 vertical. (The part number should be facing you. In the case of the “x 2’s”, either Position 1 bit may be vertical.
PAGE 13
Actuator Modifications 11 Reassembly 1 Reinstall the encoder disc with the same point at 12 o’clock but with its opposite face out. If there is any question about the orientation of the disc, refer to Figure 8. But remember that once Position 1 has been located according to that illustration, the disc must be flipped over (on an axis from 12 o’clock to 6 o’clock, so that the opposite face is out) to function properly when the direction of the motor is reversed. 2.
PAGE 14
12 Valve Alignment When the valve arrives from the factory installed on an actuator, it is accurately aligned and ready for use. However anytime the clamp ring on the actuator is loosened, as when removing the valve from the actuator for mounting through an instrument panel or oven wall, the valve and actuator must be realigned so that the internal ports and flow passages on the rotor intersect properly. CAUTION: Before removing the valve from the actuator, mark the factory alignment position of the valve.
PAGE 15
Valve Alignment 13 2. Shock from heavy or continuous use Occasionally, when valves are used in applications requiring a high-duty cycle, wear or shock can cause the screw and clamp ring to loosen. Instrument vibration may have the same effect. This allows the standoff to move, causing inaccurate rotor rotation. The most obvious symptom is observable movement of the standoff, valve, or actuator, which normally do not move when the valve is actuated. Chromatographic Symptoms of Misalignment 1.
PAGE 16
14 Valve Alignments ��
PAGE 17
Valve Alignments 15 3. Establish a flow of clean gas (50 psi is adequate) into the port offset away from the actuator. This port, called the alignment inlet in Figure 10, will be the designated inlet throughout this procedure. STUW Establish gas flow into the common port at 6 o’clock (alignment inlet in Figure 10). 4. With the valve facing you and the actuator behind the valve, the port to the left of or counterclockwise from the alignment inlet corresponds to Position 1. (See Figure 10.
PAGE 18
16 Valve Alignments 11. While holding the valve steady, firmly tighten the screw in the clamp ring. The rotor should be properly positioned at the point of maximum flow when the actuator is stepped to the next position. Congratulations, the procedure is complete. It is a good idea to cycle the valve through all its positions to be certain everything is functioning properly.
PAGE 19
17 Technical Drawings Interface Cable Assembly.................................Drawing 21464 Page 18 Logic Board Schematic.....................................Drawing 22721 Page 19 Logic Board Assembly......................................Drawing 22720 Page 20 Controller Assembly..........................................Drawing 21412 Page 21 Encoder Board Schematic................................Drawing 22727 Page 22 Encoder Board Assembly.................................
PAGE 20
��
PAGE 21
+5 C5 .10UF 50V C3 .10UF 50V S4 S3 S2 S1 HDR2X5 HW-S HW-S HW-S HW-S J3.10 J3.9 J3.8 J3.7 J3.6 J3.5 J3.4 J3.3 J3.2 J3.1 C6 .10UF 50V C4 .10UF 50V +5 +5 S8 9 8 7 6 3 4 5 1N4734 D9 10 TD ID4 ID2 ID1 BR2 BR1 RS WDI RS 2 SW1 U4 DS1232 RSI TOL 1 2 7 1 +5 76SB05 MOTOR- S4 S2 S1 STR 3 C1 27PF 50V ALE/ PROG P1.6 R4 620 +5 17 P3.7 15 P3.5 16 P3.6 DIPE* 12 P3.2 RUN 13 P3.3 14 P3.4 D10 LTL223 P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0 P1.7 P1.
PAGE 22
� � ��
PAGE 23
� ��
PAGE 24
��
PAGE 25
��
PAGE 26
��
PAGE 27
��
PAGE 28
��
PAGE 29
��
PAGE 30
� � � ��
PAGE 31
��
PAGE 32
30 Warranty This Limited Warranty gives the Buyer specific legal rights, and a Buyer may also have other rights that vary from state to state. For a period of 365 calendar days from the date of shipment, Valco Instruments Company, Inc. (hereinafter Seller) warrants the goods to be free from defect in material and workmanship to the original purchaser.