Siemens MXG461B Series, MXG461B15-0.6, MXG461B15-3, MXG461B15-1.5, MXG461B25-8 Technical Instructions
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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
ps
p
max
SNA
Pmed
IN
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).
ps = 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.
• 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.
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