Siemens MXG461B Series Owner's manual

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.
M
DIP-Switch
ON ON
12
ON
3
B-Mode
G
G0
Y
U
M
Z
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
1M
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%,
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.
SSEN0336R1
Auto
a
bb
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
ON
OFF
0 to 10 V
0 to 20 mA
mA
V
log
V
lin
V
Figure 4. Configuration DIP Switches.
DIP Function OFF (Default) ON Remarks
1
ON
OFF
Voltage or current
input
[ V ] [ mA ] Assignment of
terminal Y:
Voltage or current
2
ON
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
3
ON
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
Y
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Figure 5. Assignment of Positioning
Signal Y: Voltage or Current.
.
SSEN0341R1
Y
V
Y
V
ON
OFF
ON
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
ON
OFF
ON
OFF
U
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.
Sp
Transfer Connections
SSEN0342R1
100 %
0 % Y
0 % 100 %
100 %
0 % Y
0 % 100 %
Y
0 % 100 %
100 %
0 %
No Function Fully Open
Z-mode
Closed
U
G0
Y
M
U
G
Y
U
Z
G0
G
Y
M
AAB AAB
AAB
Z
M
G
Z
VV
V
G0
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]
10 [V]
20 [mA]
86420
2
4
100
80
60
40
20
0
[%]
90063
6
12
V
Figure 9. Equal Percentage.
SSEN0344R1
10 [V]
10 [V]
20 [mA]
86420
2
4
100
80
60
40
20
0
[%]
90064
6
12
V
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
B
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
G0
G
F
Controller
Transformer
AC/DC 24 V Operating voltage
U
U
Z
G0
G
Y
M
0 to 10Vdc / 2 to 10Vdc
0 to 20 mA / 4 to 20 mA
Y
M
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
G0
G
F
Controller
Transformer
U
U
Z
G0
G
Y
M
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
42
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
BA
B
AB
B
A
A
AB
BA
CD E
AB
10 x DN [min. 0.5 m]
AB
B
A
A
AB
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.