Siemens Industry, Inc. MXG461B Series Technical Instructions Document No. 125-4461 October 23, 2018 Modulating Control Valves with Magnetic Actuators, Positioning Control and Position Feedback for Domestic Water Description Control valves with magnetic actuators, for modulating control of domestic water, cold water and hot water systems. Features • Fast positioning time (< 2 seconds) • Selectable valve characteristic: Equal percentage or linear • Selectable standard interface: 0/2 to 10 Vdc or 0/4 to 20 mA • High resolution (>1:1000) • High rangeability • Wear-free inductive stroke measurement • Spring return A → AB closed when de-energized • Positioning control and position feedback signal • Low-friction, heavy-duty and maintenance-free • Accepts 0 to 20 Vdc phase-cut control signal input Product Numbers See Table 1. Warning/Caution Notations WARNING: Personal injury or loss of life may occur if you do not follow the procedures as specified. CAUTION: Equipment damage or loss of data may occur if you do not follow the procedures as specified. Technical Instructions MXG461B Series Modulating Control Valve Document Number 125-4461 with Magnetic Actuator October 23, 2018 Page 2 Siemens Industry, Inc. Application The MX4G61B Series valves are through-port or mixing valves with magnetic actuators. The actuator is equipped with an electronics module for positioning control and position feedback. If the power is off, the valve control path A → AB is closed. The short positioning time, high resolution and high rangeability make these valves ideal for modulating control of domestic, hot and cold-water systems. Table 1. Product Numbers. Product Number Wire Gauge (AWG) Line Size Cv p s p max S NA Pmed I N 16 14 12 (in) (psi) (psi) (VA) (W) Fuse L (ft) MXG461B15-0.6 1/2 0.7 145 70 33 15 3.15 130 215 360 MXG461B15-1.5 1/2 1.8 145 70 33 15 3.15 130 215 360 MXG461B15-3 1/2 3.5 145 70 33 15 3.15 130 215 360 MXG461B20-5 3/4 5.8 116 70 33 15 3.15 130 215 360 MXG461B25-8 1 9.3 102 40 33 15 3.15 130 215 360 MXG461B32-12 1-1/4 14 87 40 43 20 4 100 165 260 MXG461B40-20 1-1/2 23 87 40 43 20 4 100 165 260 MXG461B50-30 2 35 87 40 65 22 6.3 65 100 185 Key: p max = Maximum permissible differential pressure across the valve's control path, valid for the entire actuating range of the motorized valve (maximum recommended operating differential pressure). p s = Maximum permissible differential pressure at which the motorized valve will close securely against the pressure (close-off pressure). S NA = Nominal apparent power for selecting the transformer. Pmed = Average true power. I N = Slow fuse (mandatory). Cv = Nominal flow rate of cold water [41°F to 86°F (5°C to 30°C)]. L = Maximum cable length. With four-wire connections the maximum permissible length of the separate 14 AWG Cu signal cable is 656 feet (200 m). Ordering • The valve body and magnetic actuator assemblies cannot be separated. • The brass/bronze fittings are included. • When placing an order, specify the quantity, product number and description. Example: 1 MXG461B15-0.6 valve and 1 ASE12 Replacement Circuit Board Accessory ASE12 Replacement Circuit Board Technical/ Mechanical Design Operation Control The electronics module converts the positioning signal to a phase-cut power signal, which generates a magnetic field in the coil. This causes the armature to change its position according to the interacting forces (magnetic field, counterspring, hydraulics, etc.). The armature responds rapidly to any change in signal, transferring the corresponding movement directly to the valve plug. This enables fast changes in load to be corrected quickly and accurately. The valve’s position is measured continuously. Any disturbance in the system is rapidly corrected by the internal positioning controller, which ensures that the positioning signal and the valve stroke are exactly proportional, and also delivers the position feedback signal. MXG461B Series Modulating Control Valve Technical Instructions with Magnetic Actuator Document Number 125-4461 October 23, 2018 Siemens Industry, Inc. Page 3 Control The magnetic actuator can be driven by any controller with a 0/2 to 10 Vdc or 0/4 to 20 mA output signal. To achieve optimum control performance, it is recommended to use a 4-wire connection for the valve. NOTE: When using a dc power supply a 4-wire connection is mandatory. The controller’s signal ground terminal M must be connected to the valve’s terminal M. Terminals M and G0 have the same potential and are internally interconnected in the valve’s electronics. CAUTION: You must use a four-wire connection with Vdc power supply. Basic Diagram Spring Return Action If the power or positioning signal is switched off or fails, the valve control path (port A → AB) is automatically closed by the force of the spring. Table 2. Indication of Operating State. LED Indication Operating State, Function Remarks, Troubleshooting Green Lit Control mode Normal operation; everything OK. Flashing Calibration In manual control Wait until calibration is finished (green or red LED will be lit). Hand wheel in Man or Off position. Red Lit Calibration error Internal error Recalibrate (bridge contacts behind the calibration slot). Replace electronics module. Flashing Mains fault DC Supply -/+ Check electric main network (outside the frequency or voltage range); Vdc supply +/- connection polarity. Both Dark No power supply Electronics faulty Check electric main network, check wiring. Replace electronics module. Technical Instructions MXG461B Series Modulating Control Valve Document Number 125-4461 with Magnetic Actuator October 23, 2018 Page 4 Siemens Industry, Inc. Manual Adjustment Press (a) and turn the hand wheel (b): • clockwise (CW). Control path A → AB can be mechanically opened to between 80% and 90%, or • counterclockwise (CCW). The actuator will be switched off and the valve closed. As soon as the hand wheel is pressed and turned, neither the forced control signal Z, the input signal Y, nor the phase-cut signal acts on the actuator. The green LED will flash. For automatic control, the hand wheel must be set to the Auto position. The green LED will be lit. Figure 1. Calibration If the electronics module is replaced or the actuator turned through 180°, the valve’s electronics must be recalibrated. To recalibrate, the hand wheel must be set to Auto. The printed circuit board has a slot (see Figure 2). Calibrate by bridging the contacts located behind the slot on the printed circuit board, using a screwdriver. The valve will then travel across the full stroke to store the end positions. While calibration is in progress, the green LED will flash for about 10 seconds (see Indication of Operating State). Figure 2. DIP Switches Figure 3. Configuration DIP Switches. DIP Function OFF (Default) ON Remarks Voltage or current input [ V ] [ mA ] Assignment of terminal Y: Voltage or current Correcting span Terminals Y and U 0 to 10 Vdc, 0 to 20 mA 2 to 10 Vdc, 4 to 20 mA Offset settings of input and output Characteristic V log (equal percentage) V lin (linear) – MXG461B Series Modulating Control Valve Technical Instructions with Magnetic Actuator Document Number 125-4461 October 23, 2018 Siemens Industry, Inc. Page 5 DIP Switches, Continued Figure 4. Assignment of Positioning Signal Y: Voltage or Current. . Figure 5. Selection of Valve Characteristic: Equal-Percentage or Linear. Figure 6. Assignment of Correcting Span Y and U: 0 to 10 Vdc/0 to 20 mA or 2 to 10 Vdc/4 to 20 mA. Output signal U (position feedback signal) is dependent on the load resistance. Above 500 ohm, it is automatically a voltage signal; below 500 ohm a current signal. Forced Control Input Transfer Connections Figure 7. If terminal Z for the forced control input is: − not connected, the valve will follow the Y-signal or the phase-cut signal. − connected to G, the valve will fully open via control path A → AB. − connected to G0, the valve will close via control path A → AB. Signal Priority 1. Hand wheel position Man or Off 2. Forced control signal Z 3. Phase-cut signal 4. Signal input Y Technical Instructions MXG461B Series Modulating Control Valve Document Number 125-4461 with Magnetic Actuator October 23, 2018 Page 6 Siemens Industry, Inc. Valve Sizing Characteristic Figure 8. Equal Percentage. Figure 9. Linear. Installation Notes • Installation instructions for the valve and terminal housing are enclosed with the valve. • Valves are supplied complete with brass/bronze fittings. • The screwed valves are flat-faced to facilitate sealing with the gaskets supplied. The use of sealing compounds, tape or hemp thread is not recommended. • For electrical installation, see Wiring Diagrams. CAUTION : • Always disconnect the power before fitting or removing the terminal housing. The terminal housing is calibrated and matched to the actuator and should be replaced only by qualified personnel. • Use the valve only as a mixing or straight-through valve, not as a diverting valve. Note the flow direction. • Do not allow the surface temperature of the actuator to fall below the dew point temperature of the surrounding air (causing condensation). If necessary, insulate the valve. Do not insulate the actuator. Use in Straight-through Applications Only three-way valves are supplied. These may be used as straight-through valves by closing off port B with the accessories supplied (nut, cover and gasket). Figure 10. Straight-through Application. Mounting Position Vertical to horizontal mounting: Do not mount the valve below the horizontal. Figure 11. Acceptable Mounting Positions. MXG461B Series Modulating Control Valve Technical Instructions with Magnetic Actuator Document Number 125-4461 October 23, 2018 Siemens Industry, Inc. Page 7 Specification s Electrical Low-voltage use only Class 2 (SELV, PELV) 24 Vac Operating voltage 24 Vac ± 20% Frequency 45 to 65 Hz Typical power consumption See Table 1 P med Standby <1 W (valve fully closed) Nominal apparent power See Table 1, S NA Suitable fuse Slow, see Table 1, I N 24 Vdc Operating voltage 20 to 30 Vdc Current draw 0.5A/4A (maximum) Functional data, actuator Input Positioning signal Y 0/2 to 10 Vdc or 0/4 to 20 mA, or 0 to 20 Vdc Phs phase cut Impedance 0/2 to 10Vdc 100K ohm//5nF (load < 0.1mA) 0/4 to 20 mA 240 ohm//5nF Forced control Impedance 22K ohm Closing the valve (Z connected to G0) <1 Vac; <0.8 Vdc Opening the valve (Z connected to G0) >6 Vac; >5 Vdc No function (Z not wired) Phase-cut or positioning signal Y active Output Position feedback signal U voltage 0/2 to 10 Vdc; load resistance > 500Ω current 0/4 to 20 mA; load resistance < 500Ω Stroke measurement Inductive Nonlinearity +3% of end value Functional data, valve Nominal pressure ANSI 125 (PN 16) Operating pressure p e max 1) 232 psi (16 bar) Pressure differential p v max See Table 1 Leakage at A→ AB max. 0.05% Cv p = 14.5 psi (1 bar) B→ AB < 0.2% Cv depending on operating conditions Permissible media Drinking water, cooling, cold and hot water, water with anti-freeze Water temperature –4°F to 266°F (–20°C to 130°C) Valve characteristic 2) Equal percentage or linear, optimized near the closing point Resolution H/H 100 1 : 1000 (H = Stroke) Type of operation Modulating Position when de-energized A → AB closed Orientation: Upright to horizontal Positioning time <2 seconds Materials Valve body Red bronze (CC499K) Cover flange Red bronze (CC499K) Seat/Inner valve Stainless Steel Valve stem seal EPDM (O-ring) 1. Tested at 1.5 × PN (24 bar), similar to DIN 3230-3 2. Can be selected via DIP switch.Technical Instructions MXG461B Series Modulating Control Valve Document Number 125-4461 with Magnetic Actuator October 23, 2018 Page 8 Siemens Industry, Inc. Specifications, Continued Pipe connections Screwed fittings Bronze/brass Electrical connections Cable entries 2 × Ø 20.5 mm (for M20) Connection terminals Screw terminals for up to 12 AWG wires Min. cross-sectional area 1) 0.75 mm 2 Max. cable length See Table 1, 9 (AWG) Ambient conditions Temperature Operation and storage 23°F to 113°F (-5°C to 45°C) Transport -13°F to 158°F (-25°C to 70°C) Humidity 5 to 95% rh (non-condensing) Agency approvals Degree of protection IP31 to EN60529 Conforms to CE requirements CA2T4461.1 UL 873 Certified to Canadian standard C22.2 No. 24 C-Tick N-474 PED 2014/68/EU DVGW-Reg.-Nr. DW-6340BR0230 (EU potable water standard) Miscellaneous Weight See Figure 15 Dimensions See Figure 15 Connection Terminals WARNING: If the controller and the valve receive their power supply from separate sources, the valve transformer must not be grounded on the secondary side. A four-wire connection is mandatory with DC power supply. Controllers with: 0 to 10 Vdc 2 to 10 Vdc 0 to 20 mA 4 to 20 mA Figure 12. 1. In case of strong vibrations, use high-flex stranded wires. MXG461B Series Modulating Control Valve Technical Instructions with Magnetic Actuator Document Number 125-4461 October 23, 2018 Siemens Industry, Inc. Page 9 Connection Terminals, Continued Controllers with phase-cut 0 to 20 Vdc Figure 13. Application Examples This example shows only a schematic diagram, without installation-specific details. CAUTION: 1. Use the valve only as a mixing or straight-through valve, not a diverting valve. Note the direction of flow. 2. Ensure that adequate air venting is provided for the entire hydronic system. 3. Select a non-return valve with minimum pressure loss for the circulating pipes. Key : A Mixing circuit B Mixing circuit with bypass (underfloor heating system) C Injection circuit D Diverting circuit E Injection circuit with throughport valve Figure 14. Service CAUTION: Do not disassemble the valve and actuator combination. This assembly is factory-calibrated and should only be replaced by qualified personnel. • The low-friction and robust, maintenance-free design makes regular servicing unnecessary and ensures a long service life. • The valve stem is sealed from external influences by a maintenance-free gland. • If the red LED is lit, the electronics must be recalibrated or replaced. • If required, the circuit board can be replaced. Order part number ASE12. Technical Instructions MXG461B Series Modulating Control Valve Document Number 125-4461 with Magnetic Actuator October 23, 2018 Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective owners. © 2018 Siemens Industry, Inc. Siemens Industry, Inc. Building Technologies Division 1000 Deerfield Parkway Buffalo Grove, IL 60089-4513 USA +1-847-215-1000 Your feedback is important to us. If you have comments about this document, please send them to SBT_technical.editor.us.sbt@siemens.com Document No. 125-4461 Printed in the USA Page 10 Dimensions Figure 15. Dimensions in Inches (Millimeters). NOTE: The screwed fittings and gaskets are supplied with these valves. Product Number DN G (in) L1 L2 L3 H E F W lb (kg) (mm) (in) MXG461B15-0.6 15 Rp ½ G1B 3.15 (80) 1.67 (42.5) 1.97 (50) 13.4 (340) 3.15 (80) 4.53 (115) 15.65 (7.1) MXG461B15-1.5 15 Rp ½ G1B 3.15 (80) 1.67 (42.5) 1.97 (50) 13.4 (340) 3.15 (80) 4.53 (115) 16.09 (7.3) MXG461B15-3 15 Rp ½ G1B 3.15 (80) 1.67 (42.5) 1.97 (50) 13.4 (340) 3.15 (80) 4.53 (115) 16.09 (7.3) MXG461B20-5 20 Rp ¾ G1¼B 3.74 (95) 2.07 (52.5) 2.36 (60) 13.3 (339) 3.15 (80) 4.53 (115) 16.97 (7.7) MXG461B25-8 25 Rp 1 G1½B 4.33 (110) 2.22 (56.5) 2.52 (64) 13.6 (346) 3.15 (80) 4.53 (115) 18.73 (8.5) MXG461B32-12 32 Rp 1¼ G2B 4.92 (125) 2.66 (67.5) 2.95 (75) 15.12 (384) 3.94 (100) 4.92 (125) 28.22 (12.8) MXG461B40-20 40 Rp 1½ G2¼B 5.51 (140) 3.17 (80.5) 3.66 (93) 15.79 (401) 3.94 (100) 4.92 (125) 32.19 (14.6) MXG461B50-30 50 Rp 2 G2¾B 6.69 (170) 3.68 (93.5) 4.2 (108) 402 (15.83) 3.94 (100) 4.92 (125) 41.00 (18.6) G: External thread G…B to ISO228/1 DN: Internal thread Rp to ISO7/1 Fittings to ISO 49/DIN 2950 (supplied complete with flange gaskets) Next >