VG7000 Valve Linkage for M100 Series Motor Actuators

Transcription

1 Valve and Actuator Manual 977 Actuators and Positioners Section Technical Bulletin VG7000 Series Issue Date 1295 VG7000 Valve Linkage for M100 Series Motor Actuators lntroduction 3 Application Details 3 Glossary 4 Installation Procedures 5 Tools Needed 5 Kit Includes 5 Installation Overview 6 Configuration and Mounting 7 Actuator and Linkage 10 Travel Adjustments 13 Checkout Procedure 19 Replacement Parts Johnson Controls, Inc. 1 Part No , Rev. Code No. LIT

2 2 Actuators and Positioners VG7000 Series Technical Bulletin

3 lntroduction Application Details The VG7000 Valve Linkage converts the rotary motion of an M100 Series Motor Actuator to a linear movement in order to operate VG7000 Series Bronze Control Valves. A rack and pinion drive mechanism provides the linear movement. The rack assembly contains a spring that, when compressed by overtravel, will maintain valve closeoff to rated values. To facilitate servicing equipment, the pinion gear may be reversed for manual valve operation using a 3/8 in. (10 mm) socket drive extension. Table 1: Selection Table -- Actuators and Linkages LINKAGE NUMBER SPRING RETURN ACTUATOR NON-SPRING RETURN ACTUATOR VALVE SEATING LOAD, LB (N) VG7000-M110 M (178) Orange VG7000-M130 M130 M (449) VG7000-M M (607) Yellow VG7000-M M (1201) Red Refer to the Technical Bulletin provided with the motor actuator for information on wiring the motor actuator and related adjustments. Actuators and Positioners VG7000 Series Technical Bulletin 3

4 Glossary The following terminology is used in these instructions: CW --- Clockwise refers to the direction of rotation of the actuator shaft as seen from the load end. Zero Position --- The fully counterclockwise position of the actuator shaft; the deenergized position of a spring return actuator. Stem Up --- The initial position of the stem is up before operating the valve. Stem Down --- The initial position of the stem is down before operating the valve. Push/Drive-Down-To-Open--- Pushing or driving the stem down opens the valve. Push/Drive-Down-To-Close--- Pushing or driving the stem down closes the valve. Pull/Drive-Up-To-Open--- Pulling or driving the stem up opens the valve. Pull/Drive-Up-To-Close--- Pulling or driving the stem up closes the valve. Stem Up/Drive Down--- The stem is initially in the up position and the motor actuator (through the linkage) will drive the stem down. Stem Down/Drive Up--- The stem is initially in the down position and the motor actuator (through the linkage) will drive the stem up. Three-Way Mixing Valve--- A valve with two inlets and one outlet. Three-way valves seat on both stem up and stem down travel. 4 Actuators and Positioners VG7000 Series Technical Bulletin

5 Installation Procedures Tools Needed screwdriver, small blade screwdriver, medium blade pliers wrench, adjustable, medium socket wrench, 3/8 in. (10 mm) drive spanner wrench Kit Includes (Between Actuator and Bracket) a Mounting Bracket 11 1b Yoke or 5 2 or 3 Item Description Qty Item Description Qty 1a & 1b Mounting Bracket Assembly* 1 8 Insulating Washers 4 2 Valve Bushing (1.10 in. I.D.) 1 9 Hex Nuts, 1/ Valve Bushing (1.18 in. I.D.) 1 10 Valve Stem Connector 1 4 Yoke Nut (M20 Thread) 1 11 Rack Subassembly 1 5 Yoke Nut (M28 Thread) 1 12 Gear Subassembly 1 6 Hex Jam Nut, 1/4-28 (Red) 1 13 Washers, Black 2 7 Hex Cap Screws 4 14 Screws 2 * Assembly includes mounting bracket and yoke. Installation Overview Figure 1: Kit Components Upright mounting of the motor actuator is recommended with the actuator shaft horizontal and the linkage shaft vertical. In order to prevent damage to the motor actuator if the valve leaks or develops condensation, the actuator should not be mounted below the horizontal plane of the piping. In all cases, the actuator output shaft must be horizontal for proper operation. Actuators and Positioners VG7000 Series Technical Bulletin 5

6 Do not install the motor actuator in atmospheres with explosive vapors or escaping gases, or where vapors having deteriorating properties might attack the actuator s metal parts. Do not install where the ambient temperature of the surrounding area falls below -40 F (-40 C) for non-spring return motor actuators, or -35 F (-37 C) for spring return motor actuators. The maximum ambient temperature of the surrounding area of the motor actuator should not exceed 125 F (52 C). Valve medium temperatures above 250 F (121 C) are permissible only if the maximum ambient temperature at the motor actuator is less than 105 F (41 C). Use insulating washers furnished with the linkage kit for valve fluid temperature applications over 250 F (121 C). Locate the motor actuator where the shaft and wiring terminals are accessible. The non-spring return M100 Actuator will hold its position if power is removed. The spring return actuator will return to its zero position if power is removed. Both types will hold their current position if the control signal is satisfied. Note: The spring return is intended only as a safety feature to drive the actuator to its zero position in the event power is interrupted or turned off. There are three sections to the installation of the VG7000 valve linkage kit: 1. Configure and mount the mounting bracket assembly on the valve. 2. Mount the actuator and linkage assembly to the mounting bracket assembly, and connect to the valve. 3. Adjust the travel limits to actuate the overtravel spring and seat the valve. 6 Actuators and Positioners VG7000 Series Technical Bulletin

7 Configuration and Mounting Configuring the Yoke When configuring the yoke, two things must be considered before securing the bracket to the yoke: 1. The bracket height 2. The direction of stem travel Bracket Height For VG7000 Series Bronze Control Valves, the mounting brackets should be mounted to the yoke in the low position. Refer to Figure 2 for proper positioning. Brackets High Medium Yoke Low Figure 2: Linkage Bracket Positions Stem Travel Direction Except for M100C (reverse acting) and M100H models, with an increasing signal, the actuator always operates clockwise (CW) from its zero mechanical position. This clockwise rotation can be used to drive the valve stem up or down, depending on the way the gear housing is attached to the actuator. To configure the mounting bracket for the desired stem operation: Direction of Drive Rotation LOAD END Figure 3: Motor Actuator and Valve Actuators and Positioners VG7000 Series Technical Bulletin 7

8 1. Determine the style of valve being used and select the direction that will be required to drive the stem from its initial position. Stem Up, Two-Way Valve, Drive-Down-To-Close Stem Up, Two-Way Valve, Drive-Down-To-Open Stem Down, Two-Way Valve, Drive-Up-To-Open Stem Down, Two-Way Valve, Drive-Up-To-Close Stem Up, Three-Way Valve Stem Down, Three-Way Valve 2. For valves with the stem in the initial up position, the mounting hole in the yoke should be to the right of center, when facing the mounting bracket as shown in the left illustration of Figure 4. For valves with the stem in the initial down position, the mounting hole in the yoke will be to the left of center, when facing the mounting bracket as shown in the right illustration of Figure 4. The yoke and brackets are assembled at the factory in the low position with the yoke to the right of center, for stem up/drive down travel. To change the yoke and bracket assembly: Left Side Bracket Right Side Bracket Left Side Bracket Right Side Bracket Yoke Yoke Screw Screw Washer/Nut Mounting Hole Mounting Hole Washer/Nut For Stem Up Position Figure 4: Bracket Components For Stem Down Position 1. Remove the screw, washer, and nut securing the left and right side brackets to the yoke. 2. Position the yoke, left side, and right side brackets as determined previously. 3. Install the screw, washer, and nut to secure the side brackets to the yoke, and tighten the assembly. 8 Actuators and Positioners VG7000 Series Technical Bulletin

9 Mounting the Mounting Bracket Assembly To mount the mounting bracket assembly on the valve: Jam Nut Packing Nut Yoke Nut Bushing Figure 5: Mounting Yoke Assembly V-3000 Bonnet Adaptor (Remove From 1 Through 2 in. VG7000 Series Valves) Valve Bracket and 1. On 1 through 2 in. VG7000 Series Bronze Control Valves, the V-3000 bonnet adaptor must be removed from the valve bonnet before mounting the mounting bracket assembly. 2. Place the mounting bracket and yoke assembly on the valve over the stem and bonnet. 3. Select the proper bushing and slide it over the bonnet and into the yoke hole For 1 Through 2 in. Brass Trim Valves and 1/2 in. Through 2 in. Stainless Steel Trim Valves For 1/2 and 3/4 in. Brass Trim Valves Figure 6: Bushing Choices Actuators and Positioners VG7000 Series Technical Bulletin 9

10 4. Select the proper yoke nut and install. Fasten the yoke securely in place by tightening the yoke nut 1/8 of a turn beyond hand tight. M20 Thread M28 Thread For 1/2 and 3/4 in. Brass and Stainless Steel Trim Valves Figure 7: Yoke Nut Choices For 1 Through 2 in. Brass and Stainless Steel Trim Valves 5. Install the red hex jam nut onto the valve stem, to the bottom of the thread. Do not tighten. Actuator and Linkage Mounting the Actuator M100 Motor Actuator Hex Cap Screw Insulating Washer Mounting Bracket Nut Hex Jam Nut (Red) Yoke Figure 8: Mounting the Motor Actuator 1. Position the actuator over the mounting bracket, with its load end above the yoke as illustrated in Figure Mount the actuator onto the bracket and yoke assembly using the four bolts and nuts, and hand tighten. 10 Actuators and Positioners VG7000 Series Technical Bulletin

11 Note: If the temperature of the valve or its media is high enough to raise the actuator temperature above its limit of 125 F (52 C), insert the four white insulating washers (provided with the linkage kit) between the actuator and the mounting bracket. For lower temperature applications, the insulating washers are not required. Mounting Linkage To mount the gear housing and rack assembly to the motor actuator and valve, proceed as follows: Hole for Rack Subassembly Gear Housing Gear Gear Cover Figure 9: Gear Assembly Gear Cover Screws Housing 1. Loosen the two gear cover screws and remove the gear cover and gear from the gear housing as shown in Figure Determine the required position of the gear housing on the load end of the actuator so that the opening for the rack assembly is located as follows: stem up position, drive down operation, rack to the right stem down position, drive up operation, rack to the left Rack to the Right Rack to the Left Load End Load End Figure 10: Stem Up/Drive Down and Stem Down/Drive Up Actuators and Positioners VG7000 Series Technical Bulletin 11

12 Gear Housing Locking Screw Figure 11: Close-Up of Gear Housing Rack Subassembly Rack and Assembly 3. Insert the rack subassembly into the gear housing by sliding it from the bottom through the hole in the gear housing as shown in Figure 11. Note: If it is difficult to insert the rack subassembly, check the locking screw to make sure that it is not interfering with movement of the rack. If it is, back it out until there is no interference. 4. When the rack subassembly is completely in the housing, tighten the locking screw temporarily to retain the rack subassembly in position. Washers Screws Rack Subassembly Spring Housing Jam Nut Figure 12: Mounting Gear Housing 5. Position the gear housing and rack subassembly over the valve stem and align the gear housing with the M100 drive shaft. 12 Actuators and Positioners VG7000 Series Technical Bulletin

13 6. Attach the gear housing to the motor actuator with the washers and gear housing screws. Hand tighten the screws in place. 7. Loosen the locking screw and lower the rack subassembly to the valve stem. Thread the rack subassembly spring housing completely onto the valve stem. 8. Tighten the red hex jam nut (shown in Figure 12) against the stem connector. 9. Align the actuator with the valve body to avoid binding of the linkage, and tighten the four mounting bolts. 10. Tighten the screws securing the gear housing to a maximum of 25 lb in (2.83 N m). Travel Adjustments! CAUTION: Do not perform the following operations if the valve is under pressure. Shut off the pump power, including standby power, before attempting manual operation. The procedure for adjusting the travel limits is different for the various configurations of valves: Stem Up, Two-Way Valve, Drive-Down-To-Close (Drive-Down-To-Close, Spring Return Open is the most common configuration for heating.) Stem Up, Two-Way Valve, Drive-Down-To-Open Stem Down, Two-Way Valve, Drive-Up-To-Open Stem Down, Two-Way Valve, Drive-Up-To-Close Stem Up, Three-Way Valve Stem Down, Three-Way Valve! CAUTION: Travel adjustments are made with power connected to the actuator. On M100A Actuators, always disconnect the power from the actuator before adjusting the slide stop to increase travel. Actuators and Positioners VG7000 Series Technical Bulletin 13

14 Overtravel The rack and pinion linkage assembly includes a spring capsule that must be preset during commissioning to provide overtravel and ensure tight closeoff. An additional 0.1 in. of overtravel is required on two-way valves and 0.2 in. on three-way valves (0.1 in. against each seat). An overtravel of 0.1 in. represents 15 rotation of the actuator and an overtravel of 0.2 in. represents 30 rotation. Table 2 lists the valve lift and overtravel required. Table 2: Actuator Travel Set Up Valve Size (in.) Valve Style Lift Rotation of Actuator Additional for Overtravel Total Rotation/ Travel 1/2 and 3/4 Two-Way 0.31 in. (8 mm) (0.1 in.) 65 1 and 1-1/4 Two-Way 0.5 in. (13 mm) (0.1 in.) /2 and 2 Two-Way 0.75 in. (19 mm) (0.1 in.) 130 1/2 and 3/4 Three-Way 0.31 in. (8 mm) (0.2 in.) 80 1 and 1-1/4 Three-Way 0.5 in. (13 mm) (0.2 in.) /2 and 2 Three-Way 0.75 in. (19 mm) (0.2 in.) 145 Direction of Drive Rotation COM to CW Shorted Keyway 10 (AX) Zero Reference Position Figure 13: Position Direction of Drive Rotation COM to CCW Shorted LOAD END Drive Shaft Actuator Zero The actuators are factory set at the zero position which is 10 clockwise from square, and for 90 clockwise travel as shown in Figure 13. Each 15 of actuator rotation results in 0.1 in. (2.5 mm) of linear movement of the rack assembly. The 90 actuator rotation provides 1/2 in. (13 mm) of valve stem lift plus 0.1 in. (2.5 mm) of overtravel. Stem Up Two-Way Valve For stem up valves, make certain that the rack is assembled to the right of the gear housing center. Drive-Down-To-Close Valves 1. Manually move the rack and spring housing assembly, connected to the valve stem, to the full up position. Figure 14: Pinion Gear Ends 2. Insert the pinion gear into the gear housing with the square hole end (as illustrated in Figure 14) over the actuator shaft. 14 Actuators and Positioners VG7000 Series Technical Bulletin

15 3. Replace the gear cover and tighten the gear cover screws (as illustrated in Figure 9). 4. Refer to the Technical Bulletin provided with the motor actuator and adjust the actuator travel to drive the stem down and compress the spring in the housing. (Turn the power off when adjusting M100A slide stops.) Actuator Drive Figure 15: Upper Indicating Full Upper Visual Guide Lower Visual Guide Flat Washers Visual Guide Down Travel 5. As shown in Figure 15, when the edge of the upper flat washer is opposite the notch in the upper visual guide, the travel is properly adjusted. This represents 0.1 in. (2.5 mm) compression of the spring with the valve seated. Drive-Down-To-Open Valves 1. Power the actuator to position the actuator 15 from zero. This is equivalent to 0.1 in. (2.5 mm) of stem travel. 2. Manually move the rack and spring housing assembly, connected to the valve stem, to the full up position. 3. Insert the pinion gear into the gear housing with the square hole over the actuator shaft. Actuators and Positioners VG7000 Series Technical Bulletin 15

16 4. Replace the gear cover and tighten the gear cover screws. 5. Allow the actuator to return to zero position. Actuator Drive Upper Visual Guide Flat Washers Figure 16: Lower Indicating Full Up Lower Visual Guide Visual Guide Travel 6. As shown in Figure 16, the edge of the lower flat washer should appear opposite the notch in the lower visual indicator to indicate compression of the spring with the valve seated. 7. Refer to the Technical Bulletin provided with the motor actuator and adjust the actuator travel for the full and overtravel as described in the Overtravel section. Stem Down Two-Way Valves For stem down valves, make certain that the rack is assembled to the left of the gear housing. Drive Up-To-Close Valves 1. Manually move the rack and spring housing assembly, connected to the valve stem, to the full down position. 2. Insert the pinion gear into the gear housing with the square hole over the actuator shaft. 3. Replace the gear cover and tighten the gear cover screws. 4. Refer to the Technical Bulletin provided with the motor actuator and adjust the actuator travel to drive the stem up and compress the spring in the housing. (Turn the power off when adjusting the M100A slide stops.) 5. When the edge of the lower flat washer is opposite the notch in the lower visual guide, the travel is properly adjusted. This represents 0.1 in. (2.5 mm) compression of the spring with the valve seated. Drive-Up-To-Open Valves 1. Power the actuator to position the actuator 15 from zero. This is equivalent to 0.1 in. (2.5 mm) of stem travel. 2. Hold the rack in its full down position. 3. Insert the pinion gear into the gear housing with the square hole over the actuator shaft. 4. Replace the gear cover and tighten the gear cover screws. 5. Allow the actuator to return to zero position. The edge of the upper flat washer should appear opposite the notch in the upper visual indicator, to indicate compression of the spring with the valve seated. 16 Actuators and Positioners VG7000 Series Technical Bulletin

17 6. Refer to the Technical Bulletin provided with the motor actuator and adjust the actuator travel for full lift and overtravel as described in the Overtravel section. Three-Way Valves Three-way valves can be assembled so that the upper seat is initially closed (stem up) or so that the lower seat is initially closed (stem down). Stem up or stem down operation is determined by the yoke configuration and position of the rack and gear housing. Travel adjustments are similar for either case, and require both upper and lower limits to be set. 1. Power the actuator to position the drive shaft 15 from zero. This is equivalent to 0.1 in. (2.5 mm) of stem travel. 2. Manually position the rack to the full stem up or stem down position as required. 3. Insert the pinion gear into the gear housing with the square hole over the actuator shaft. 4. Replace the gear cover and screws. Upper Visual Guide For Lower Seat Closeoff Lower Visual Guide For Upper Seat Close Off Upper Valve Seat (Three-Way Valves) Valve Plug Lower Valve Seat (Two-Way and Three-Way Valves) Modulating Lower Seat Closed Upper Seat Closed Figure 17: Linkage Adjustment (Stem Up, Three-Way Valve) 5. Allow the actuator to return to the zero position. The flat washer should align with the notch at the bottom of the spring case for stem up valves or with the upper notch for stem down valves. This indicates valve seating at the zero position. 6. Refer to the Technical Bulletin provided with the motor actuator and adjust the travel to fully stroke the valve and compress the overtravel spring at full lift. The washer should be aligned with the notch opposite the starting point. 7. Figure 17 illustrates the overtravel indication for seating stem up three-way valves. Manual Operation! CAUTION: Do not perform this operation if the valve is under pressure. Shut off the pump power, including standby power, before attempting manual operation. The valve can be manually operated without electrical power when necessary for maintenance or emergency operation. To operate the valve manually: 1. Remove the gear cover. Actuators and Positioners VG7000 Series Technical Bulletin 17

18 2. Remove the pinion gear from the gear housing and insert the gear with the square hole facing out. 3. A 3/8 in. (10 mm) socket wrench drive will fit in the square hole and enable manual positioning of the valve. 4. The spring can be compressed and then held in position by turning the locking screw (located on the gear housing) in, to hold the rack in position. IMPORTANT: To restore automatic operation, return the actuator to the zero position and reinstall the gear with the square hole engaging the actuator shaft. Repeat the travel limit adjustments as necessary. 18 Actuators and Positioners VG7000 Series Technical Bulletin

19 Checkout Procedure After installation and adjustment, run the system through several complete open/close cycles to ensure that all components are functioning correctly. Check that the actuator responds to the controller and operates the valve properly, and that the linkage operates without binding. Also check for proper voltage.! CAUTION: The actuator should not be stalled by the valve. The actuator may be damaged if it is not free to complete its full stroke. Table 2: Actuator Connections for Travel Limit Adjustment Jumper Terminals Model Clockwise (CW) Counterclockwise (CCW) M100 A 1 and 2 1 and 3 M100C COM to CW COM to CCW M100E M100F* S1 to S2 (Apply 24 VAC to A and C for Clockwise Rotation) Apply 12 VDC to BO1 (Negative) and COM (Positive) Disconnect S1, S2, A, and C Apply 12 VDC to BO1 (Positive) and COM (Negative) M100G or M100H 8 to T1 8 to 10 M100J 8 and 9 8 and 10 M100Q 8 to T1 8 to 10 M100M R to B Disconnect R from B *The M100F Actuator has no travel limits (electronic or mechanical). Extreme care must be exercised when using the spring return model, so as not to drive the actuator CCW beyond the spring return mechanical zero or CW beyond the 270 maximum travel rating. Note: For the M100F, remove the controller wires and apply 24 VAC to terminals COM and T2 while making adjustments; for all other models, apply 24 VAC to terminals T1 and T2. Spring return models will go full CCW when power to is removed from these terminals. Actuators and Positioners VG7000 Series Technical Bulletin 19

20 Replacement Parts Table 3 lists replacement parts that may be ordered from your nearest Johnson Controls representative. Table 3: VG7000 Linkage Repair Parts Description Code Number Remarks Gear Assembly GER18A-600 Includes CVR115-1 and GER28-1 Gear Only GER Gear Cover CVR115-1 Includes Mounting Screws RCK12A lb (178 N) (Used with VG7000-M110) Spring Housing and Rack Assemblies* RCK12A-626 RCK12A lb (445 N) (Used with VG7000-M130) 150 lb (668 N) (Used with VG7000-M140) RCK12A lb (1202 N) (Used with VG7000-M150) * These Spring Housing and Rack Assemblies include a spring and standard connector (1/4-28) installed. Be sure to specify the spring load required for the specific application when ordering one of these kits. Controls Group FAN E. Michigan Street Valve and Actuator Manual P.O. Box 423 Printed in U.S.A. Milwaukee, WI Actuators and Positioners VG7000 Series Technical Bulletin