Siemens MXG461.15-3.0U User Guide

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MXG461…U, MXF461…U Series

Modulating Control Valves with Magnetic Actuators

Technical Instructions

Document No. CA1N4455E-P25

May 8, 2009

Description

Features

Product Numbers

Mixing or straight-through valves with magnetic actuators for modulating control of hot and chilled water systems in closed circuits.

• Fast positioning time (< two seconds), high-resolution stroke (1:1000).

• Linear or equal-percentage valve characteristic (user-selected).

• Switch-selectable control signal: 0 to 10 Vdc, 2 to 10 Vdc, or 4 to 20 mA.

• Wear-free inductive stroke measurement.

• Low friction, robust, no maintenance required.

• Fail-safe feature: A → AB closed when de-energized.

• Positioning control.

• Position feedback.

• Manual control.

See Table 1.

Warning/Caution Notations

Sval0016R1

MXG461…U MXF461…U

Sval0015R1

WARNING:

CAUTION:

Personal injury or loss of life may occur if you do not follow the procedures as specified.

Equipment damage or loss of data may occur if you do not follow the procedures as specified.

Siemens Building Technologies, Inc.

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Technical Instructions MXG461…U, MXF461…U Modulating Control Valves Document Number CA1N4455E-P25 with Magnetic Actuators May 8, 2009

Application

Ordering

Principles/ Construction

Automatic Control

The MXG461...U (screwed fitting) and MXF461...U (flange fitting) valves are mixing or straight-through valves with a factory calibrated and mounted magnetic actuator. The magnetic actuator incorporates an electronics module for position control and positioning feedback. Control path A → AB is closed when the valve is de-energized.

CAUTION:

The valve is suitable for straight-through normally closed or three-way applications and may be installed only in a mixing arrangement. The direction of flow (A → AB) must be as indicated on the valve.

The fast positioning time, high resolution and high rangeability make these valves ideal for modulating control of chilled and hot water systems in closed circuits. Sturdy construction makes maintenance and regular servicing unnecessary and ensures a long service life.

When using a 2-1/2 inch flanged valve in a straight-through application, a blanking flange is required for the third port. If required, order Z155/65 separately.

For screwed valves, no additional ordering is required. The components required to create a straight-through valve are included with the valve.

The control signal is converted by the microprocessor in the electronics module into an output signal that generates a magnetic field in the core. This causes the only moving part, the armature, to change its position in accordance with the interacting forces (magnetic field, counter-spring, hydraulics, and so on). The armature responds rapidly to any change in signal, transferring the corresponding movement directly to the control disc, enabling fast changes in load to be corrected quickly and accurately. The valve position is measured continuously. The positioning controller ensures an exactly proportional relationship between the control signal and the valve stroke.

Valve Characteristic

Volumetric flow

[%]

100

SVAL0227R1

86420

Control signal

Volumetric flow

100

10 [V]

20 [mA]

Sval0012R2

[%]

86420

10 [V]

20 [mA]

Control signal

Figure 1. Equal-percentage. Figure 2. Linear.

In the event of a power failure, or if the power is switched off, the spring force closes the valve automatically (control path ports A → AB normally closed).

Page 2 Siemens Building Technologies, Inc.

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MXG461…U, MXF461…U Modulating Control Valves Technical Instructions

With Magnetic Actuators Document Number CA1N4455E-P25 May 8, 2009

Manual Control

The valve control path (ports A → AB) can be opened mechanically up to 95% of the full stroke by pressing the handwheel inward and turning it clockwise (to the MANUAL position). This disables the control signal from the controller.

To disable automatic control of the valve, press the handwheel inward and turn it counterclockwise (to the OFF position). The valve will close.

For automatic control, the handwheel must be set to the

OFF

AUTO

MANUAL

Sval0006R1

Figure 3. Selecting

Automatic Control.

AUTO position (the handwheel will spring out).

Sizing

Table 1. MX.461…U - Valves Sizing.

Maximum Wire Gauge Line

Product Numbers

Size

Close-off

Δ P

max

Pressure

med

18 16 14 12

(in) (gpm) (psi) (bar) (psi) (VA) (W) (A) Cable Length L (ft)

MXG461.15-0.6U 1/2 0.7 44 3 44 29 5 3.15 108 213 361 525 MXG461.15-1.5U 1/2 1.7 44 3 44 29 5 3.15 108 213 361 525 MXG461.15-3.0U 1/2 3.5 44 3 44 29 5 3.15 108 213 361 525 MXG461.20-5.0U 3/4 5.8 44 3 44 29 5 3.15 108 213 361 525 MXG461.25-8.0U 1 9.3 44 3 44 29 5 3.15 108 213 361 525 MXG461.32-12U 1-1/4 14.0 44 3 44 29 5 3.15 108 213 361 525 MXG461.40-20U 1-1/2 23.0 44 3 44 44 6 4.00 66 118 197 328 MXG461.50-30U 2 35.0 44 3 44 44 6 4.00 66 118 197 328 MXF461.65-50U 2-1/2 58.0 44 3 44 46 6 5.00 49 98 164 262

Key:

ΔPmax = Maximum permissible differential pressure across the valve’s control path,

valid for the entire actuating range of the motorized valve.

NA = Nominal apparent power for selecting transformer

med = Typical power consumption

N = Required slow fuse

I C

= Flow rate to IEC534-2-4

Control path A → AB (normally closed): Tolerance ±5% Control path B → AB (normally open): Tolerance ±10%

L = Maximum cable length. With four-wire connections, the maximum

permissible length of the separate 16 AWG Cu (copper) signal cable is 656 feet. With three-wire connections, the maximum permissible cable length is reduced to 1/3 of the values shown in the table.

1 = All data relates to a 24 Vac supply.

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Technical Instructions MXG461…U, MXF461…U Modulating Control Valves Document Number CA1N4455E-P25 with Magnetic Actuators May 8, 2009

Table 2. Water Flow Chart.

Product Number

MXG461.15-0.6U 1/2 0.7 0.7 1 1.2 1.4 1.6 1.7 1.9 2.0 2.1 2.2 2.7 3.1 3.8 4.4 4.9

MXG461.15-1.5U 1/2 1.7 1.7 2.4 2.9 3.4 3.8 4.2 4.5 4.8 5.1 5.4 6.6 7.6 9.3 10.8 12

MXG461.15-30U 1/2 3.5 3.5 4.9 6.1 7 7.8 8.6 9.3 9.9 10.5 11 14 16 19 22 25

MXG461.20-50U 3/4 5.8 5.8 8.2 10 12 13 14 15 16 17 18 22 26 32 37 —

MXG461.25-8.0U 1 9.3 9.3 13 16 19 21 23 25 26 28 29 36 42 51 59 —

MXG461.32-12U 1-1/4 14 14 20 24 28 31 34 37 40 42 44 54 63 77 89 —

MXG461.40-20U 1-1/2 23 23 33 40 46 51 56 61 65 69 73 89 103 126 145 —

MXG461.50-30U 2 35 35 49 61 70 78 86 93 99 105 111 136 157 192 221 —

MXF461.65-50U 2-1/2 58 58 82 100 116 130 142 153 164 174 183 225 259 318 367 —

Line Size

(in)

ΔP

V100

CVS 1 2 3 4 5 6 7 8 9 10 15 20 30 40 50

PSI

LED Indicators

The two-color LED display indicating operating status can be viewed by opening the cover of the electronics module.

Table 3. LED Display.

LED Display Status Description

LED green On continuously Automatic mode: Auto (normal, no faults)

Flashing – Mechanically set to MANUAL

– Mechanically set to OFF – Currently in auto-calibration mode

LED red On continuously – General fault

– General calibration fault – Microcontroller fault

Flashing – Faulty 24 Vac supply (that is, too low)

LED Off – No 24 Vac supply

– Fault with electronics module

As a general rule, the LED can only assume the conditions in Table 3 (continuously red or green, flashing red or green, or off).

Mounting

Mounting and operating instructions are printed on the actuator and on the electronics module.

The valve is suitable only for straight-through or three-way applications and may be installed only in a mixing arrangement. In the case of the straight-through valve, strict observance of the direction of flow is essential.

Do not mount with actuator below horizontal position.

Access for Mounting

It is essential to maintain the specified minimum clearance above and to the side of the actuator and/or electronics module for servicing, installing and heat dissipation:

• 1/2-inch to 1-1/4 inches = 4 inches

• 1-1/2 inches to 2-1/2 inches = 6 inches

Also see Dimensions.

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MXG461…U, MXF461…U Modulating Control Valves Technical Instructions With Magnetic Actuators Document Number CA1N4455E-P25 May 8, 2009

Mounting, Continued

Only three-way MX.461...U valves are supplied. They may be used as straight-through normally closed valves by closing off port "B":

Straight-through Valves

Port "B" can be sealed with a Z155/65

blanking flange and gasket.

Port "B" can be sealed with the

accessories supplied (blanking disk, gasket, and the nut).

BLANKING

FLANGE

SVAL0008R1

Figure 4. MXF461...U Flanged Valves in

Straight-through Applications.

Sval0007R1

Figure 5. MXG461...U Screwed Valves in

Straight-through Applications.

Installation

Maintenance

MXG461...U screwed valves are flat-faced to facilitate sealing with the gaskets supplied.

Do not use hemp, tape or thread-sealing compound.

Do not insulate the actuator.

For notes on electrical installation, see Terminal Layout.

The valves and actuators require no maintenance or service. The valve stem is sealed with a maintenance-free O-ring gland.

Should the valve electronics prove faulty, the electronics module should be exchanged for a replacement part, part number ASE1 (1/2-inch to 1-1/4 inches) or ASE2 (1-1/2 inches to 2-1/2 inches). Mounting instructions are enclosed (Ref. 35678).

WARNING:

Under operating conditions within the limits defined by the application data, the actuator will become hot, but this does not represent a fire risk.

Always maintain the minimum clearance specified (see Dimensions).

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Technical Instructions MXG461…U, MXF461…U Modulating Control Valves Document Number CA1N4455E-P25 with Magnetic Actuators May 8, 2009

Specifications

Electrical Interface

Power supply Class 2 Supply voltage 24 Vac, 50/60 Hz

– Maximum voltage tolerance +20/–15% Control signal (user-selected) 0 to 10 Vdc, 2 to 10 Vdc, or 4 to 20 mA Software class Class A

Nominal power See Sizing

Position Signal Y 0 to 10 Vdc, 2 to 10 Vdc, or 4 to 20 mA Impedance 0 to 10 Vdc or 2 to 10 Vdc 100k Ω //5nF 4 to 20 mA 100 Ω //5nF Position feedback signal 0 to 10 Vdc; load resistance > 500 Ω

Product Specific Data Applications To EN60730

Nominal pressure 232 psi (16 bar) Permissible Operating pressure p

Differential pressure ΔP

Leakage at ΔP

v = 14.5 psi (0.1 Mpa) (1bar) A → AB Max. 0.02 % Cv (to IEC534-4)

max See Table 1

max 150 psi

B → AB Depends on operating conditions (<0.2% C

Admissible media Water, or water/glycol mixtures with maximum 50% glycol

Temperature of medium 34°F to 266°F (1°C to 130°C) Valve characteristic (stroke, k

vs) Linear or equal percentage (user-

selected), optimized near the closing point (to IEC534-2-4)

Stroke resolution ΔH/H

100 1:1000 (H = stroke)

Hysteresis Typically 3% Type of operation Modulating Manual adjustment Yes, with handwheel Position with actuator de-energized A → AB closed Orientation Upright to horizontal

Note that orientation affects protection standard

Positioning time <2 seconds

Materials (valve body) Housing parts Cast iron

Plug CrNi Steel Seat Brass Valve stem seal EPDM (O-ring) Bellows Tombac, bronze, CrNi steel

Electrical connection Connection terminal Screw terminals

Per terminal, with wire (no lug) 2 × 16 AWG or 1 × 14 AWG Per terminal with wire 2 × 16 AWG or 1 × 12 AWG

Miscellaneous Weight (including packaging) See Dimensions

Dimensions See Dimensions

Ambient conditions Maximum ambient temperature 113°F (45°C)

Agency Approvals UL listing Per UL 873

C-UL Certified to Canadian Standard C22.2 No. 24

Suitable for use in air handling spaces NEMA Type 1

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MXG461…U, MXF461…U Modulating Control Valves Technical Instructions With Magnetic Actuators Document Number CA1N4455E-P25 May 8, 2009

Wiring Terminals

WARNING:

Earth ground must be connected to the pipe work.

1 2 3 4 5 6

Sval0011R1

G0 G Y

X YF

24 Vac

24 Vac Control signal input Control signal reference voltage 0 to 10 Vdc stroke signal output (position feedback) Override control

Figure 6. Terminal Layout for Four-wire Connections.

Wiring Diagram

VAC

MX...461...

0-10 VDC 2-10 VDC 4-20 mA

Sval00228R1

24 VAC

VAC

+ ±

MX...461...

Figure 7. Connection to Controller with Four-wire Output.

U = Indication of valve position (only where required). 0 to 10 Vdc → 0 to 100% volumetric flow

SSEN0093R1

TWISTED PAIRS

If the cables for the 24 Vac supply and the control signal 0 to 10 Vdc (2 to 10 Vdc, 4 to 20 mA are routed separately, twisted pairs are not required for the 24 Vac cable).

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Technical Instructions MXG461…U, MXF461…U Modulating Control Valves Document Number CA1N4455E-P25 with Magnetic Actuators May 8, 2009

Forced Control Feature (Input Terminal YF/6)

0 Vac (Bridge G0 – YF) 24 Vac (Bridge G – YF) 1 to 9 Vdc at F

Control path A → AB closed Control path A → AB open Continuously variable low limit control 10% to 90% volume flow (the higher value YF of Y takes priority). This function is available with valves with a manufacturing date of 990701 or later.

Configuration Switches

Switch

1 Characteristic 2 Control signal

3 Volts or mA

Off

Linear

0 to 10 Vdc*

0(2) to 10 Vdc*

Equal percentage*

2 to 10 Vdc or 4 to 20 mA

4 to 20 mA

* Factory setting: equal percentage valve characteristic, 0 to 10 Vdc control signal.

70038c

Calibration

Figure 8. DIP Switches.

The MX…461…P magnetic valves are factory-calibrated at 0% and 100% stroke. When commissioning the valves (especially under extreme usage conditions) there may still be some leakage via control path A → AB with a 0% stroke control signal (0 Vdc, 4 mA or 2 Vdc). In this case, the valve can be recalibrated as follows (see Figure 8):

• Use a pin or paper clip to push the button in opening (A) in the terminal housing.

• During calibration, the LED light (B) in the electronics module will flash green for

approximately 10 seconds. The valve will be briefly closed and fully opened.

Application Example

CAUTION:

This valve is suitable for straight-through normally closed or three-way applications only, and should only be installed in a mixing arrangement.

(min. 20 in)

Sval0014R1

x D N

D E

A Mixing circuit

B Mixing circuit with bypass (underfloor heating) C Injection circuit D Diverting circuit E Injection circuit with straight-through valve

Page 8 Siemens Building Technologies, Inc.

Figure 9. Hydraulic Circuits.

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MXG461…U, MXF461…U Modulating Control Valves Technical Instructions With Magnetic Actuators Document Number CA1N4455E-P25 May 8, 2009

Service

CAUTION:

Do not disassemble the valve and actuator combination. This assembly is factorycalibrated, and should only be replaced by qualified personnel.

Dimensions

All dimensions in inches (millimeters)

Sval0009.eps

min.

100

min. 100

ø d

A B

ø k

ø D

Table 4. MXF461…U – Flanged Valve with Electronics Module.

Product Number L L1 D b k d H E F lbs

MXF461.65-50U

11.42 (290)

4.92

(125)

7.00

(177.8)

0.88

(22.4)

5.50

(139.7)

0.75

(19.05)

15.43 (392)

3.15 (80)

3.94

(100)

(kg)

63.1

(28.6)

NOTE: Installer must supply counterflanges. lbs. (kg) = Weight (including packaging)

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Technical Instructions MXG461…U, MXF461…U Modulating Control Valves Document Number CA1N4455E-P25 with Magnetic Actuators May 8, 2009

Dimensions, Continued

All dimensions in inches (millimeters)

Sval0010R1

min.

100

min. 100

60433

Table 5. MXG461…U –Valves with Electronics Module.

Product Number DI DA L L1 L2 * H E F lbs

MXG461.15-0.6U 1/2 1

MXG461.15-1.5U 1/2 1

MXG461.15-3.0U 1/2 1

MXG461.20-5.0U 3/4 1-1/4

MXG461.25-8.0U 1 1-1/2

(110)

MXG461.32-12U 1-1/4 2

(125)

MXG461.40-20U 1-1/2 2-1/4

(140)

MXG461.50-30U 2 2-3/4

(170)

3.15 (80)

3.74 (95)

4.33

4.92

5.51

6.69

1.67

(42.5)

1.67

(42.5)

1.67

(42.5)

2.07

(52.5)

2.22

(56.5)

2.66

(67.5)

3.17

(80.5)

3.68

(93.5)

2.01 (51)

2.40 (61)

2.56 (65)

2.99 (76)

3.70 (94)

4.29

(109)

9.45

(240)

9.45

(240)

9.45

(240)

10.24 (260)

10.63 (270)

11.22 (285)

12.60 (320)

13.39 (340)

3.15 (80)

3.94

(100)

3.94

(100)

3.94

(100)

3.94

(100)

3.94

(100)

3.94

(100)

3.94

(100)

3.94

(100)

4.72

(120)

4.72

(120)

(kg)

8.4

(3.8)

8.4

(3.8)

8.4

(3.8)

9.3

(4.2)

10.4 (4.7)

12.3 (5.6)

20.5 (9.3)

26.2

(11.9)

* When used as a straight-through valve lbs. (kg) = Weight (including packaging)

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. Other product or company names mentioned herein may be the trademarks of their respective owners. © 2009 Siemens Building Technologies, Inc.

Siemens Building Technologies, Inc.

Industry Sector 1000 Deerfield Parkway Buffalo Grove, IL 60089-4513 U.S.A. (847) 215-1000

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Document No. CA1N4455E-P25

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