AERCO MXG-461 Series Control Valve - Manufactured by Siemens - Manual (Page 3)

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Siemens Modulating control valves with magnetic actuators, PN16 CA1N4455en
Building Technologies 15.12.2009
Should the valve electronics prove faulty, the electronics module must be replaced by
the ASE1 (DN15…32) or ASE2 (DN40…65) replacement electronics module.
Mounting Instructions no. 35678 are included.
See overview, page 14.
Technical and mechanical design
For a detailed description of operation, refer to data sheet CA1N4028E.
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 in accordance with the interacting forces (magnetic field, counterspring,
hydraulics). The armature responds rapidly to any change in signal, transferring the
corresponding movement directly to the valve plug, enabling fast changes in load to be
corrected quickly and accurately.
The valve’s position is measured continuously (inductive). The internal positioning
controller balances any disturbance in the system rapidly and delivers the position
feedback signal. The valve stroke is proportional to the positioning signal.
If the positioning signal is interrupted, or in the event of a power failure, the valve’s
return spring will automatically close control path A
→ AB.
The magnetic actuator can be driven by a Siemens controller or a controller of other
manufacture that deliver a DC 0/2...10 V or DC 4... 20 mA output signal.
To achieve optimum control performance, it is recommended to use a 4-wire
connection.
MANUAL
The valve control path (ports A
→ AB) can be opened
manually to between 80 and 90 % of the full stroke
(depending on DN) by pressing the hand wheel
inwards and turning it clockwise (MANUAL setting).
This disables the control signal from the controller, the
green LED is flashing.
OFF
To disable automatic control of the valve, press the
hand wheel inwards and turn it anti-clockwise (to the
OFF position). The valve will close, the green LED is
flashing.
AUTO
For automatic control, the hand wheel must be set to
the AUTO position (the hand wheel will spring out),
the green LED is lit.
OFF
AUTO
MANUAL
44
5
5Z
03
Replacement
electronics module
ASE1, ASE2
Rev. no.
Control operation
Spring return facility
Control
Manual control