63-2516—08 - ML6425, ML7425 Spring Return Electric

63-2516—08 - ML6425, ML7425 Spring Return Electric
ML6425, ML7425 Spring Return
Electric Linear Valve Actuators
PRODUCT DATA
FEATURES
ML6425 and ML7425
• Accurate valve positioning.
• Quick and easy installation.
• No separate linkage required.
• On power failure:
ML6425A and ML7425A drive valve stem down.
ML6425B and ML7425B draw valve stem up.
• Conduit connector is standard.
• No adjustments required.
• True spring return on power failure.
• Low power consumption.
• High close-off ratings.
APPLICATION
The ML6425 Spring Return Electric Linear Valve Actuators
are floating control actuators used with controllers that provide
a switched or floating single-pole double-throw (spdt) output.
These actuators operate standard Honeywell valves in
heating, ventilating, and air conditioning (HVAC) applications.
The ML7425 Spring Return Electric Linear Valve Actuators
are modulating control actuators used with controllers that
provide an analog output of 0 to 10 Vdc or 2 to 10 Vdc. These
actuators operate standard Honeywell valves in heating,
ventilating, and air conditioning (HVAC) applications. An
internal selector can be used to reverse the direction of action.
• Force-limiting end switches.
• Direct/reverse action.
• Synchronous motor.
• Corrosion resistant design.
• Maintenance free.
ML7425
• Position Feedback signal.
• Fail-safe position selection for control signal loss.
Contents
Application ........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
WIring ...............................................................................
Operation ..........................................................................
Checkout ..........................................................................
1
2
2
3
4
7
8
63-2516-08
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
SPECIFICATIONS
Spring Return Time: 12 seconds.
Models:
Model
Spring Return Action
ML6425A Drive valve stem down on power
ML7425A failure
ML6425B Draw valve stem up on power
ML7425B failure
Description
Temperature Ranges:
Ambient: 14° to 122° F (-10° to +50° C).
Storage: -40° to +158° F (-40° to +70° C).
Maximum Valve Medium: 300° F (149° C).
Electric
Linear Valve
Actuator
Humidity: 5 to 95 percent relative humidity, noncondensing.
Close-off Pressure Ratings: Refer to Table 1.
Dimensions: Refer to Fig. 1.
Protection Standard: IP54.
Weight: 5.1 lb (2.3 kg).
Approvals:
Underwriter’s Laboratories, Inc. UL94-5V Flame Retardant.
Meets CE requirements.
Electrical Ratings:
Power Input: 24 Vac ±15%, 60 Hz.
Power Consumption:
ML6425: 11 VA maximum at 24 Vac.
ML7425: 12 VA maximum at 24 Vac.
Signal Source Output Resistance: 1 kOhm maximum.
Signal Load: 1 mA maximum.
Cable entry: Conduit connector and one knockout on case.
Actuator Material:
Cover: ABS-FR plastic.
Base: PBTP-FR plastic.
Yoke: Diecast aluminum.
Accessories:
 43196000-001 High Temperature Kit (for actuators with
3/4 in. stroke). Increases the maximum temperature to
428°F (220°C).
ML6425 Only
 43191679-111 Single Auxiliary Potentiometer (10K ohm).
 43191679-112 Single Auxiliary Potentiometer (220 ohm).
 43191680-105 Dual Auxiliary Switch (24 Vac use only).
Signal Inputs (Supply Voltage Between Terminals):
ML6425:
B and 24 Vac: Drive valve stem down.
W and 24 Vac: Draw valve stem up.
ML7425: 0 to 10 Vdc or 2 to 10 Vdc.
Stem Force: 135 lbf (600 N).
Actuator Stroke: 3/4 in. (19 mm).
Actuator Run Time at 60 Hz: 90 seconds.
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information,
or would like to comment on our products or services, please write or phone:
1.
2.
Your local Honeywell Environmental and Combustion Controls Sales Office (check white pages of your phone directory).
Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
3. http://customer.honeywell.com or http://customer.honeywell.ca
International Sales and Service Offices in all principal cities of the world. Manufacturing in Belgium, Canada, China, Czech
Republic, Germany, Hungary, Italy, Mexico, Netherlands, United Kingdom, and United States.
63-2516—08
2
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
Table 1. Close-off Ratings for ML6425, ML7425 Electric Linear Valve Actuators and Honeywell Valves (psi).
Type
Flange
NPT
Valve
1/2 in.
V5011A
3/4 in.
1 in.
1-1/4 in. 1-1/2 in.
2 in.
2-1/2 in.
3 in.
—
—
—
—
—
—
28
16
V3350/ 3351/ 3450/ 3451
—
—
—
—
—
—
21
14
V5013B, C; V3360/ 3361/ 3460/ 3461
—
—
—
—
—
—
21a
14a
V5011F, G
150b
150b
150b
134b
77
49
28
16
V5011H, J
150
150
150
145
—
—
—
—
V5011N1xxx, V5011N3xxx, V5013N
230
230
163
104
67
37
—
—
V5011N2xxx
100
100
100
100
67
37
—
—
V5013F
150
150
150
126
77
49
—
—
a
Represents maximum pressure difference between the outlet and either of the two inlets.
not exceed 100 psi with V5011G valves used in steam applications.
bDo
Location
5-5/15 6-5/16
x
(135)
(161)
Install the actuator in a location that allows enough clearance
for mounting accessories and for servicing.
14-5/16 (364)
MINIMUM
CLEARANCE
2-11/16 (67)
CAUTION
Equipment Damage Hazard.
Can damage actuator due to condensation or a
valve gland leak.
Install the actuator in a position above horizontal.
11-1/4
(284)
Mounting
1.
1/2 (13) FPT
7-5/8
(192)
2.
YOKE
DIAMETER
1-3/8 (35)
3.
M7892A
4.
Fig. 1. Approximate Dimensions of ML6425, ML7425
Electric Linear Valve Actuator in in. (mm).
5.
INSTALLATION
6.
When Installing this Product...
1.
2.
3.
4.
Place the actuator on the valve with the U-bolt around
the valve collar (Refer to Fig. 2).
Place the U-bolt against the valve collar and secure the
actuator to the valve by turning each U-bolt nut
clockwise. To assure even pressure on the collar, first
tighten the nuts finger-tight and then alternate turning
each U-bolt nut until both are snug.
Push aside the stem button retaining clip and hold
(Refer to Fig. 3).
Lift valve stem until the head of the valve stem button is
inside the large slot of the stem button retaining clip on
the actuator.
Release the stem button retaining clip to secure the stem
button. Check to make certain the stem button is secured
by the retaining clip.
Remove the cover from the actuator using a Phillips or
crosspoint screwdriver (Refer to Fig. 4).
CAUTION
Personal Injury Hazard.
Read instructions carefully. Failure to follow them could
damage the product or cause a hazardous condition.
Check ratings and description given in the specifications
to make sure the product is suitable for your application.
Installer must be a trained, experienced service
technician.
After installation is complete, check out product
operation as provided in these instructions.
Manual spring handle under tension can turn
quickly when lifted, pinching fingers between
handle and plastic casing.
Use a screwdriver to lift and release manual spring
handle (Refer to Fig. 5).
7.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment circuitry.
Disconnect power supply before installation.
3
Remove the manual spring handle retaining clip, and lift
and release the handle (Refer to Fig. 5). The easiest way
to perform this operation safely is to:
a. Remove the retaining clip.
b. Wedge a small, flat-bladed screwdriver under the
manual spring handle and pry up the handle
(Refer to Fig. 5).
63-2516—08
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
M6629
Fig. 5. Removing Spring Retaining Clip and Releasing
Manual Spring Handle.
M6632
WIRING
Fig. 2. Attaching Actuator to Valve Collar.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment circuitry.
Disconnect power supply before installation.
All wiring must comply with local electrical codes, ordinances
and regulations. Voltage and frequency of the transformer used
with the actuator must correspond with the power supply and
actuator characteristics. Refer to Figures 6 through 13 for
connection information and typical wiring hookups.
1.
M6633
Fig. 3. Securing Actuator to Valve.
Feed power and control wires through the conduit
connector located on the bottom of the actuator case
(See Fig. 6).
CAUTION
Equipment Damage Hazard.
Conduit connection or removal can break an
unsupported connector.
When removing or attaching conduit, use a wrench to
support the motor connector.
2.
3.
4.
Using the wiring diagram in Fig. 7, connect power and
control wires. Make sure that all wiring is correct.
When wiring is complete, replace the cover on the
actuator (Refer to Fig. 14).
Apply power and control signals to the actuator.
M6627
Fig. 4. Removing Actuator Cover.
M6630
Fig. 6. Connecting Power and Control Wiring.
63-2516—08
4
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
ML6425A,B
ML7425
WIRING
STRIP
WIRING
STRIP
2
B
F
F
+
–
+
24 Vac
COMMON
T2
T6984 (FLOATING CONTROLLER)
4
2
MOTOR OPEN
MOTOR CLOSE
W
INPUT
(FEEDBACK)
OUTPUT
3
–
T1
O1
T5
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
ALL WIRING BLOCKS HAVE THE SAME
NUMBER OF TERMINALS (8), BUT THE ONLY
TERMINALS THAT ARE ACTIVE ON THIS
BLOCK ARE T1, T5, W, AND B.
3
4
O2
T1
TS
1
T
3
THE T-Y-G TERMINALS ARE A THREE TERMINAL
WIRING BLOCK SEPARATE FROM THE MAIN
BLOCK. THEY DO NOT APPEAR ON ALL MODELS
BECAUSE THEY ARE FOR A SINGLE FEEDBACK
POTENTIOMETER (10K OR 220 OHMS). THE
REQUIRED WIRING BLOCKS ARE PART OF
THE POTENTIOMETER ACCESSORY KITS.
L1
(HOT)
L2
Y
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL
FEEDBACK SECTION.
3
0-10 Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL
INPUT (+) SECTION.
G
1
L1
(HOT)
C8286B
L2
MOTOR OPEN SIGNAL DRAWS VALVE STEM
UPWARDS. MOTOR CLOSE SIGNAL DRIVES
VALVE STEM DOWNWARDS.
Fig. 9. ML7425 Wiring using Controller Feedback Output
and a Common Transformer.
M25446
Fig. 7. ML6425 Wiring.
T7984
(2-10 Vdc
CONTROLLER)
2-10 Vdc OUTPUT
24 VAC
COMMON
2
ML7425A,B
ML7425
WIRING
STRIP
WIRING
STRIP
F
F
+
–
+
–
T2
T2
T1
T1
O1
O1
O2
O2
TS
TS
1
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
TS MUST BE POWERED, OR THE ACTUATOR WILL
SPRING RETURN.
SENSOR
1
2
3
4
6
5
1
L1
(HOT)
L2
3
2
DUAL
TRANSFORMERS
1
T775
(WITH 2-10 VDC OUTPUT)
L1
(HOT)
L2
1
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M7894
Fig. 10. ML7425 Wiring using 2 to 10 Vdc Control Signal
and Separate Transformers.
M17394A
Fig. 8. ML7425 Wiring.
5
63-2516—08
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
SENSOR
ML7425
ML7425
WIRING
STRIP
SENSOR
1
2
3
4
5
1
L1
(HOT)
L2
F
+
–
T2
T1
WIRING
STRIP
6
3
2
TS
1
4
5
6
1
L1
(HOT)
L2
T2
3
T1
O1
TS
1
M7895
Fig. 11. ML7425 Wiring using 2 to 10 Vdc Control Signal
and a Common Transformer.
2
SINGLE
TRANSFORMER
40 VA 24 VAC
1
500 OHM
RESISTOR
T775
(WITH 4-20 MA OUTPUT)
O2
T775
(WITH 2-10 VDC OUTPUT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
3
+
–
O1
O2
2
F
SINGLE
TRANSFORMER
40 VA 24 VAC
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M7897
Fig. 13. ML7425 Wiring using 4 to 20 mA Control Signal
and a Common Transformer.
NOTE: 500 ohm resistor not shipped with product.
ML7425
WIRING
STRIP
SENSOR
1
2
3
4
5
6
1
L1
(HOT)
L2
F
+
–
T2
T1
O1
O2
TS
3
2
DUAL
TRANSFORMERS
1
500 OHM
RESISTOR
T775
(WITH 4-20 MA OUTPUT)
L1
(HOT)
1
L2
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M7896
M6628
Fig. 12. ML7425 Wiring using 4 to 20 mA Control Signal
and Separate Transformers.
Fig. 14. Replacing Actuator Cover.
NOTE: 500 ohm resistor not shipped with product.
DIRECTION
OF ACTION
INPUT SIGNAL
RANGE
W3
W2
INPUT SIGNAL
FAILURE
W1
LED
M33403
Fig. 15. Pushbuttons and potentiometer (default
positions).
63-2516—08
6
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
Auxiliary Potentiometers
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.
The 43191679 Auxiliary Potentiometers can be used as
feedback potentiometers and to provide remote indication of
the valve position. Refer to the Installation Instructions packed
with the potentiometers.
Output Signal Feedback (F)
Auxiliary Switches
An analog output signal (2 to 10 Vdc) that represents the
actual actuator stem position is available at terminal F. It can be
used for remote indication of the stem position. When the valve
stem is fully downward, the output signal is 10 Vdc.
CAUTION
Equipment Damage Hazard.
When the valve stem is up, the output signal is 0 or 2 Vdc. The
output of the signal does not change when the action of the
actuator is reversed using W3. See Direction of Action.
Improper voltage will damage the auxiliary switch
beyond repair.
Use the 43191680 Dual Auxiliary Switch only with 24
Vac applications.
Actuator Override
To override the control signal (for freeze protection or similar
applications), connect the 24 Vac common (T2) to either
terminal O1 or O2. Connecting to terminal O1 fully extends the
actuator stem. Connecting to O2 fully retracts the actuator
stem.
The 43191680 Dual Auxiliary Switch can be used on both the
ML6425 and ML7425 Electric Linear Valve Actuators.
Switching points are adjustable over the full length of actuator
stroke; for example, the switch can be used to switch pumps or
provide remote indication of any stroke position. Refer to the
Installation Instructions packed with the auxiliary switch.
The control signal (+) is ignored when the override signal is
applied to Terminal O1 or O2. This override can be achieved
with a switch or a relay (See Fig. 16).
OPERATION
In the actuator, the drive of a synchronous motor is converted
into the linear motion of the actuator stem by using a spur gear
transmission. A button retainer clip connects the actuator stem
to the valve stem.
ML7425
WIRING
STRIP
2
F
F
+
–
An integrated spring package limits the stem force to a factory
adjusted value in either direction. Installed microswitches turn
off the actuator when the specified stem force is reached.
+
INPUT
(FEEDBACK)
OUTPUT
–
3
T2
T1
The ML6425, ML7425 Spring Return Valve Actuators provide a
safety valve position in the event of power failure. On power
failure, the ML6425A and ML7425A extend the actuator stem;
the ML6425B and ML7425B retract the actuator stem.
O1
O2
TS
SP3T
OVERRIDE
SWITCH
4
1
The actuators are shipped from the factory with a spring
handle retaining clip installed, so the actuator can be
connected to the valve without applying power. Remove this
clip after the actuator is installed. (Refer to the Installation
section.)
L1
(HOT)
L2
ML7425
Signal Input (+)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL
FEEDBACK SECTION.
3
0-10Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL
INPUT (+) SECTION.
4
SEE OVERRIDE SECTION FOR DETAILS ON
OVERRIDE OPERATION.
M7906A
Fig. 16. Connections for Overriding Control Signal to Drive
ML7425 to a Specific Position.
The range of the analog input signal (+) can be changed by
pressing the right-hand pushbutton (W2) located on the printed
circuit board (see Fig. 15). If the corresponding LED is lit, this
indicates that the actuator is set for 0 to 10 Vdc operation
(factory setting); if it is dark, the actuator is set for 2 to 10 Vdc
operation.
Direction of Action (ML7425 only)
The direction of action can be reversed by pressing the left
hand pushbutton (W3) located on the printed circuit board (see
Fig. 15). If the corresponding LED is lit, this indicates that the
actuator stem will be up at a control signal of 0(2) Vdc (factory
setting); if it is dark, the actuator stem will be down at a control
signal of 0(2) Vdc.
Signal Input Failure
Using the potentiometer (W1) located on the printed circuit
board (see Fig. 15), the actuator can be adjusted such that in
case the signal input fails (e.g., due 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%).
7
63-2516—08
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
CHECKOUT
The actuator can be checked out either directly or by using a controller.
Direct Checkout
1.
2.
3.
4.
5.
Controller Checkout
Mount the actuator for the required application; see
Installation section.
Check the valve position and make sure that 24 Vac is
correctly applied to the actuator.
Apply the power to the appropriate leadwires to move
the valve.
If the actuator does not move, make sure the actuator is
properly installed/wired.
If the actuator installation and wiring are both correct
and the actuator does not run, replace the actuator.
1.
2.
3.
4.
5.
6.
Adjust the setpoint of the controller to call for opening
the valve. Observe the actuator.
If the valve is closed, it should begin to open.
If the valve remains closed, move the setpoint further
toward the open setting.
If the valve does not move, check for 24 Vac in the
actuator power input.
If 24 Vac is present and the actuator does not operate,
check the voltage across the controller leadwires to
determine if the device is miswired.
If the wiring is correct, 24 Vac is present on the power
input terminals, and the actuator does not run, replace
the actuator.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
® U.S. Registered Trademark
© 2012 Honeywell International Inc.
63-2516—08 M.S. Rev. 01-12
Printed in United States
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