ML7420 ML7425
GENERAL
The ML7420A / ML7425A,B actuators are designed for
modulating control with controllers providing an analog output
of 0...10 Vdc or 2...10 Vdc. They operate Honeywell’s
standard valves in heating, district heating, ventilation, and air
conditioning (HVAC) applications. Spring-return models
provide a safety position at power failure.
ML7420A/ML7425A,B
Electric Linear Valve Actuator
SPECIFICATION DATA
FEATURES
• Easy and quick installation
• No separate linkage required
• No adjustments required
• Low power consumption
• Force-limiting end stops
• Spring-return models (ML7425A,B)
• Manual operation knob
• Position feedback signal
• 0...10 Vdc or 2...10 Vdc signal input selectable
• Direct / reverse action selectable
• Stroke position on signal failure selectable
• Corrosion-resistant design
• Maintenance-free
SPECIFICATIONS
Temperature Limits
Ambient operating limits -10...+50 °C
Ambient storage limits -40...+70 °C at 5...95% r.h.
Medium valve
temperature Max. 150 °C (220 °C with
High-Temperature kit)
Signals
Signal input voltage y =
R
Signal source 1 kΩ max.
Position feedback signal x = 2...10 Vdc
Load 1 mA max.
Safety
Protection class III as per EN60730-1
Protection standard IP54 as per EN60529
Flame retardant housing V0 as per UL94
(with metal cable gland)
0...10 Vdc or 2...10 Vdc
= 100kΩ
i
at 5...95% r.h.
® U.S. Registered Trademark EN0B-0261GE51 R0707
Copyright © 2007 Honeywell Inc. • All rights reserved
ML7420A/ML7425A,B
Wiring
Wiring terminals 1.5 mm
Cable entry M20. Two additional knock-
outs M18 and M20 for
auxiliary switch and
potentiometer accessories
model number ML7420A6009 ML7420A6017 ML7425A6008 ML7425B6007
supply voltage 24 Vac ±15%; 50/60 Hz
power consumption
signal input 0(2) Vdc Actuator stem retracted. Two-way valve:”open”, three-way valve port A-AB:”closed” *
signal input 10 Vdc Actuator stem extended. Two-way valve:”closed”, three-way valve port A-AB:”open” *
stroke 20 mm
run time at 50 Hz 1 min 0.5 min 1.8 min
close-off force ≥ 600 N
spring return time ⎯ ≈12 s
spring return direction
* Factory setting; can be reversed by pressing the right-hand pushbutton (W3) located on the PCB (see Fig. 1).
2
5 VA 7 VA 12 VA
⎯
Weight
non-spring return type 1.3 kg
spring return type 2.4 kg
Material
Cover ABS-FR
Base glass fiber reinforced plastic
Yoke aluminum diecast
actuator stem extends
at power failure
actuator stem retracts
at power failure
OPERATION
General
The drive of a synchronous motor is converted into linear
motion of the actuator stem via a spur gear transmission. The
actuator stem is connected with the valve stem by a buttonkeyed retainer connection.
An integrated spring package limits the stem force to a
factory-set value in either direction.
The actuator switches off precisely when the specified stem
force is reached.
Manual Operation
Actuators without spring return are equipped with a manual
operation knob used in case of power failure. Manual
operation is permitted only after the power supply is switched
off or disconnected.
To operate, push the manual operation knob down and turn
clockwise to move the stem downward and counterclockwise
to move the stem upward. If the actuator returns to automatic
control, the manual operation knob unlocks automatically.
In the case of actuators with spring return, the manual
operation knob is located under the cover.
Override Option
All actuators have an integrated override function (see also
Fig. 3). When the override signal is applied, the actuator
drives to the fully-open or fully-closed position, regardless of
the controller signal.
Spring Return
The ML7425A,B spring return actuators provide a defined
safety position of the valve in case of power failure.
The spring return actuators are shipped from the factory with
a shipment stop (to lock the manual operation knob) in order
to allow connection of the stem button retainer to the valve
stem without power supply.
Electrical Installation
The actuators are delivered with a pre-installed cable gland
M20 and two additional knock-outs for M18 and M20. Max.
cable length/diameter for field mounting:
200 m / 1.5 mm
100 m / 1.5 mm2 (ML7420A6017)
NOTE: To avoid malfunction, it is necessary to connect
2
or
24 Vac power and ground (see Fig. 3 on page 4).
Action
The direction of action can be reversed by pressing the lefthand pushbutton (W3) located on the printed circuit board
(see Fig. 1), If the corresponding LED is lit, this indicates that
the actuator stem will retract at a control signal of 0(2) Vdc
(factory setting); if it is dark, the actuator stem will extend at a
control signal of 0(2) Vdc.
Input Signal Range
The range of the analog input signal Y can be changed by
pressing the right-hand pushbutton (W2) located on the
printed circuit board (see Fig. 1). If the corresponding LED is
lit, this indicates that the actuator is set for 0...10 V operation
(factory setting); if it is dark, the actuator is set for 2...10 V
operation.
EN0B-0261GE51 R0707 2
ML7420A/ML7425A,B
Input Signal Failure
Using the potentiometer (W1) located on the printed circuit
board (see Fig. 1), the actuator can be adjusted such that in
case the signal input fails (due e.g. to a broken wire) or
exceeds 12.5 V, the actuator will run to any pre-configured
position between 0% and 100%. The factory setting is with
the actuator stem in the central position (50%).
NOTE: The two pushbuttons (W3 and W2) and the
potentiometer (W1) are accessible after the cover
has been removed and are located at the rear side
of the protection sheet of the printed circuit board.
input signal
direction
of action
W3
input signal
range
W2
failure
W1
LED
Fig. 1. Pushbuttons and potentiometer (default positions)
Output Signal "POSITION"
An analog output signal 2...10 Vdc ”POSITION” is available
which represents the actual actuator position. It can be used
for remote indication.
When the actuator stem is extended, the output signal is
10 Vdc.
Accessories
Auxiliary Switches
The actuators can be equipped on-site with an auxiliary switch
unit with two switches. Their switching points are adjustable
over the full length of the actuator stroke. The switches can
be used to switch pumps or provide remote indication of any
stroke position. A cable gland M20 is delivered with the unit.
Part number: 43191680-205
High-Temperature Kit
(for applications >150°C medium temperature)
order number
High-Temperature
43196000-001
43196000-002
43196000-038
Kit
V5011R,S/V5013R,S,E
valve DN
V5011A/V5011K
V5013A/V5013G
V5328A/V5329A
V5011A
V5013A/V5013G
V5328A/V5329A
V5049A
V5050A
V5328A
V5016A
V5025A
V5049A (PN25/40)
V5050 (PN16)
V5050 (PN25/40)
15 – 40
15 – 40
15 – 50
15 – 32
40 – 80
15 – 65
15 – 80
100 – 150
100 – 150
100 – 150
80 – 100
100 – 150
50
50
100
CLOSE-OFF PRESSURE RATINGS
stem force
stroke
valve
size
V5011R/S 1600 1600 1000 700 460 260
V5328A 1600/1000 1000 1000 600 350 200 120 50
V5016A 1600 1600 1600 1600 1600 1600 1600 1600
V5025A 2500 2500 2500 2500 2500 2500 2500 2500
V5049A 1600/1000 1000 1000 600 350 200 120
V5013R/E 1600 1600 1000 700 460 260
V5329C 600 600 600 600 480 260 160 100
V5329A 1000 1000 1000 790 480 260 160 100
V5050A 1000 1000 1000 600 350 200 120 50
For details on the valves, see following Specification Data No.:
V5011R EN0B-0064GE51 V5328A EN0B-0432GE02 V5095A EN0B-0412GE51
V5011S EN0B-0085GE51 V5329A/5050A EN0B-0310GE51 V5013R EN0B-0065GE51
V5016A EN0B-0440GE51 V5025A EN0B-0442GE51 V5013E EN0B-0446GE51
V5049A EN0B-0238GE51
mm 15 20 25 32 40 50 65 80
inch ½ ¾ 1 1 ¼ 1 ½ 2 2 ½ 3
valves close-off pressure ratings (in kPa)
600 N
20 mm
3 EN0B-0261GE51 R0707
ML7420A/ML7425A,B
A
DIMENSIONS
135x(161)
67.4
242
100
0
1000
135x(161)
67.4
284
233
322 (with High-Temperature Kit: 402 mm)
141
100
0
1000
192
364 (with High-Temperature Kit: 444 mm)
Fig. 2. ML7420A (left) and ML7425A,B (right), dimensions (in mm)
WIRING
ML7420A (0/2...10 V)
position
Y
24 V
M
24 V~
1
2
0(2)...10 V
override
2...10 V
24 V
24 V~
! !
ML7425A,B (0/2...10 V)
position
0(2)...10 V
safety
temperature limiter
M
Y
24 V
24 V~
1
2
B
2...10 V
24 V
24 V~
override
Fig. 3. Wiring
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorized Representative:
Automation and Control Solutions
Honeywell GmbH
Böblinger Straβe 17
71101 Schönaich
Germany
Phone: (49) 7031 63701
Fax: (49) 7031 637493
http://europe.hbc.honeywell.com
Subject to change without notice. Printed in Germany
EN0B-0261GE51 R0707
ccessory
3 456
1 2
S1 S2
auxiliary switches
250 Vac / 5(3) A
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