Siemens MXG461B Series Manuale del proprietario

MXG461B Series

Technical Instructions

Document No. 125-4461

May 3, 2006

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

Phase-cut signal input for Staefa controllers

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.

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.

Siemens Building Technologies, Inc.

Technical Instructions MXG461 Series Modulating Control Valve

Document Number 125-4461 with Magnetic Actuator

May 3, 2006

Page 2 Siemens Building Technologies, Inc.

Table 1. Product Numbers.

Wire Gauge (AWG)

Line Size Cv ΔpsΔpvmax SNA Pmed IN16 14 12

Product

Number (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:

Δpvmax = 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).

Δps= Maximum permissible differential pressure at which the motorized valve will

close securely against the pressure (close-off pressure).

SNA = Nominal apparent power for selecting the transformer.

Pmed = Average true power.

IN= 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.

The Z366 stem heater must be ordered separately.

When placing an order, specify the quantity, product number and description.

Example: 1 MXG461B15-0.6 valve and 1 Z366 stem heater

Accessories Z366 Stem heater for 24 Vac/10W.

Required for medium temperatures

<32°F (0°C).

ASE12 Replacement Circuit Board

SVAL0229R1

Figure 1.

Technical/

Mechanical Design

Automatic 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

May 3, 2006

Siemens Building Technologies, 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.

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

SSEN0335R1

Power

Supply

Power

Control

Micro

Controller

Stroke

Control

Hand Control

Stroke

Sensor

Calib.

DIP-Switch

ON ON

B-Mode

X3 AMP

Bus-Subprint

Phs

0/4 to 20 mA

0/2 to 10 V

0/4 to 20 mA

0/2 to 10 V

Phs

Green / Red

SPh

0 to 20 Vdc

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

Lit Control mode Normal operation; everything OK.

Green

Flashing Calibration

In manual control

Wait until calibration is finished

(green or red LED will be lit).

Hand wheel in Man or Off position.

Lit Calibration error

Internal error

Recalibrate (bridge contacts behind the

calibration slot).

Replace electronics module.

Red 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 MXG461 Series Modulating Control Valve

Document Number 125-4461 with Magnetic Actuator

May 3, 2006

Page 4 Siemens Building Technologies, 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%,

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.

SSEN0336R1

Auto

Man Off

Figure 2.

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 3). 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).

SSEN0337R1

Figure 3.

DIP Switches

SSEN0338R1

2 to 10 V

4 to 20 mA

OFF

0 to 10 V

0 to 20 mA

log

lin

Figure 4. Configuration DIP Switches.

DIP Function OFF (Default) ON Remarks

OFF

Voltage or current

input

[ V ]

[ mA ]

Assignment of

terminal Y:

Voltage or current

OFF

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

OFF

Characteristic

Vlog (equal

percentage)

Vlin (linear) –

MXG461B Series Modulating Control Valve Technical Instructions

with Magnetic Actuator Document Number 125-4461

May 3, 2006

Siemens Building Technologies, Inc. Page 5

DIP Switches, Continued

SSEN0339R1

0 to 10 V 2 to 10 V

0 to 20 mA 4 to 20 mA

OFF

Figure 5. Assignment of Positioning

Signal Y: Voltage or Current.

SSEN0341R1

OFF

Figure 6. Selection of Valve

Characteristic: Equal-Percentage or

Linear.

SSEN0340R1

0 to 10 V 2 to 10 V

0 to 20 mA 4 to 20 mA

OFF

Ri > 500

Ri < 500

Figure 7. Assignment of Correcting

an 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.

Transfer Connections

SSEN0342R1

100 %

0 % Y

0 % 100 %

100 %

0 % Y

0 % 100 %

100 %

0 %

No Function Fully Open

Z-mode

Closed

AAB AAB

AAB

Forced Control Input

Figure 8.

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 MXG461 Series Modulating Control Valve

Document Number 125-4461 with Magnetic Actuator

May 3, 2006

Page 6 Siemens Building Technologies, Inc.

Valve Sizing

Characteristic

SSEN0343R1

10 [V]

20 [mA]

86420

100

[%]

90063

Figure 9. Equal Percentage.

SSEN0344R1

10 [V]

20 [mA]

86420

100

[%]

90064

Figure 10. 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).

SVAL0230R1

AAB

Figure 11. Straight-through

Application.

Mounting Position Vertical to horizontal mounting:

Do not mount the valve below the horizontal.

SSEN0345R1

90 90

IP31IP31

Figure 12. Acceptable Mounting

Positions.

MXG461B Series Modulating Control Valve Technical Instructions

with Magnetic Actuator Document Number 125-4461

May 3, 2006

Siemens Building Technologies, Inc. Page 7

Connecting the Z366

Stem Heater The Z366 includes connectors for the

stem heater.

The stem heater is designed for a

24 Vac power supply.



  

   

SVAL0091R1

Figure 13. Z366 Stem Heater.

Specifications

Electrical

Low-voltage use only Class 2 (SELV, PELV)

24 Vac

Operating voltage 24 Vac +15/-10%

Frequency 45 to 65 Hz

Typical power consumption See Table 1 Pmed

Standby <1 W (valve fully closed)

Nominal apparent power See Table 1, SNA

Suitable fuse Slow, see Table 1, IN

24 Vdc

Operating voltage 20 to 30 Vdc

Functional data, actuator Input

Positioning signal Y 0/2 to 10 Vdc or 0/4 to 20 mA, or

0 to 20 Vdc Phs

Impedance 0/2 to 10Vdc 100K ohm//5nF

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 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 pemax 1) 232 psi (16 bar)

Pressure differential Δpvmax See Table 1

Leakage A →AB Maximum 0.05% CV

B→AB Depends on application data

(0.2%C

V )

Water temperature2) –4°F to 248°F (–20°C to 120°C)

Valve characteristic 3) Equal percentage or linear, optimized

near the closing point

Resolution ΔH/H100 >1 : 1000 (H = Stroke)

Type of operation Modulating

Position when de-energized A →AB closed

Orientation: Upright to horizontal

Positioning time <2 seconds

1. Tested at 1.5 × PN (24 bar), similar to DIN 3230-3

2. For medium temperatures <32°F (0°C), the Z366 stem heating element is required.

3. Can be selected via DIP switch.

Technical Instructions MXG461 Series Modulating Control Valve

Document Number 125-4461 with Magnetic Actuator

May 3, 2006

Page 8 Siemens Building Technologies, Inc.

Specifications,

Continued

Materials

Valve body Red bronze

Cover flange Red bronze

Seat/Inner valve Stainless Steel

Valve stem seal EPDM (O-ring)

Pipe connections Screwed fittings Bronze/brass

Electrical connections Cable entries 3 × M20 × 1.5 or PG13.5/G1/2

Connection terminals Screw terminals for up to 12 AWG wires

Min. cross-sectional area 1) 0.75 mm2

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 IEC 529

Conforms to CE requirements

UL 873

Certified to Canadian standard C22.2 No. 24

C-Tick N-474

PED 97/23/EC:

pressure-carrying parts

Par. 1, section. 2.1.4/Par. 3, section 3

Fluid group 2

Miscellaneous Weight See Figure 18

Dimensions See Figure 18

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

SSEN0346R1

Controller

Transformer

AC/DC 24 V Operating voltage

0 to 10Vdc / 2 to 10Vdc

0 to 20 mA / 4 to 20 mA

0 to 10Vdc / 2 to 10Vdc

0 to 20 mA / 4 to 20 mA

System neutral (SN)

Control signal

System potential (SP)

Measuring neutral (= G0)

Positioning feedback signal

Override input

Figure 14.

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

May 3, 2006

Siemens Building Technologies, Inc. Page 9

Connection

Terminals,

Continued

Controllers with phase-cut

0 to 20 Vdc

SSEN0347R1

Controller

Transformer

0 to 20Vdc

Phase-cut signal

AC/DC 24 V Operating voltage

0 to 10Vdc / 2 to 10Vdc

0 to 20 mA / 4 to 20 mA

0 to 10Vdc / 2 to 10Vdc

0 to 20 mA / 4 to 20 mA

System neutral (SN)

Control signal

System potential (SP)

Measuring neutral (= G0)

Positioning feedback signal

Override input

Figure 15.

SVAL0231R1

G0 G Y M

MXG461B...

Connecting cable

to heater

Supply cable

Figure 16. Stem Heating Element Z366.

Technical Instructions MXG461 Series Modulating Control Valve

Document Number 125-4461 with Magnetic Actuator

May 3, 2006

Page 10 Siemens Building Technologies, Inc.

This example shows only a schematic diagram, without installation-specific details.

Application

Examples

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.

SVAL0232R1

CD E

10 x DN [min. 0.5 m]

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 17.

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.

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