95C-10879 - ML6984 Direct Coupled Valve Actuator

95C-10879 - ML6984 Direct Coupled Valve Actuator
ML6984
Direct Coupled Valve Actuator
PRODUCT DATA
FEATURES
• Allows the use of one common transformer
power supply for multiple actuators and
controllers
• Self-contained, motorized valve linkage
• Linkage self-adjusts to valve stroke of up to
19mm (3/4")
• Multipose mounting
• Strong valve seat closing force 710 Newton
(160 lbs.)
• Compact size for easy installation in
confined area
• One device for either Vac or Vdc power
supply application
• Electronic current sensing provides internal
protection and positive full closing force
• Field-addable auxiliary switches available
APPLICATION
The ML6984 is a self-contained, self-adjusting,
linear motorized linkage that mounts directly
onto V5011 two-way or V5013 three-way valves
and provides up to 19 mm (3/4") of linear travel
(stem lift). For use with low voltage 3-wire SPDT
Series 20 (on-off), Series 60 (floating) electro­
mechanical (dry contacts) or electronic (triac) output
controllers.
• Compatible with 3-wire or 5-wire control
systems
Contents
Specifications..........................................2
Order information................................... 2
Installation.............................................. 3
Wiring Schematics..................................5
Operation and Checkout.........................6
PCY 06/99
© Honeywell Ltd. 1999 Printed in Canada
95C-10879
ML6984 DIRECT COUPLED VALVE ACTUATOR
SPECIFICATIONS
Shipping Weight:
IMPORTANT:
Accessories/Parts:
The specifications given in this publication do not
include normal manufacturing tolerances. Therefore, an
individual unit may not exactly match the listed
specifications. Also, this product is tested and
calibrated under closely controlled conditions and some
minor differences in performance can be expected if
those conditions are changed.
272630A--Auxiliary switch assembly (1-SPDT)
272630B--Auxiliary switch assembly (2-SPDT)
272775-- Replacement motor brush kit
40003793-005--Mounting hardware bag assembly
Approx. 1 kg (2.2 lbs)
Mechanical Ratings:
Stroke--19mm (3/4") or less
Stroke timing-- Approx. 63 seconds for 3/4" stroke
Closing Force-- 710N (160 lbs.) Nominal*
Ambient Rating:
*Rating applies to both directions.
Operating Temperature:
0°C to 55°C (32°F to 131°F)
Shipping Temperature:
-40°C to +65°C (-40°F to 150°F)
Relative Humidity:
15% to 95% at 40°C (104°F)
Performance Specifications:
Minimum Signal Input Duration: 200 milli-second
Life Expectancy-- (at rated load and power
conditions) 50,000 full stroke cycles plus 1,000,000
repositions at 10% stem travel or 10 years,
whichever occurs first.
Acoustic Noise:
55 dBA max. Sound Pressure Level at 1 m (39")
distance.
!
Electrical Ratings:
CAUTION
Minimum required control signal input
duration is 200 milli-second. Short and
rapid cycling/repositioning will result in
possible device lock-up or reduced
service life.
Power supply/consumption:
24V (Nominal), 50/60Hz or
24 to 28 Vdc
6VA(Running), 12VA(Valve seating)
ORDERING INFORMATION
When purchasing replacement and modernization products from your wholesaler or distributor, refer to the price sheets
for complete ordering number, or specify-­
1. Model number.
2. Valve body type and model number.
3. Accessories, if desired.
If you have additional questions, need further information, or would like to comment on our products or services, please
write or phone:
1. Your local Honeywell Home and Building Control Sales office (Check white pages of your phone directory).
2. Home and Building Control Customer Service Department
Honeywell Limited/Limitee
155 Gordon Baker Road
North York , Ontario
Canada M2H 3N7
In U.S.A. -Honeywell Inc. 1985 Douglas Drive North, Minneapolis, Minnesota 55422-4386 (612) 951-1000
International Sales Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, United Kingdom, U.S.A.
2
ML6984 DIRECT COUPLED VALVE ACTUATOR
FIG. 1 -- DIMENSIONS OF ML6984 VALVE ACTUATOR IN MM (INCHES).
INSTALLATION
Mounting:
1. Ensure that the valve body is installed correctly, that
is, the arrow points in the direction of the flow.
2. Although the actuator can be mounted in any
position, it is preferable that the ML6984 is mounted
above the valve body. This will minimize the risk of
damage to the ML6984 in the event of condensation
or a valve gland leak.
3. Remove the stem button (Fig. 3) from the valve stem.
Save the set screw inside the stem button for later
installation. The button itself is not needed.
4. Slide the position indicator (plastic disk or rubber O­
ring) over the valve stem. (See inset, Fig. 3) Indicator
will self-align to the marking on the yoke after one
complete operating cycle.
Assembly of ML6984 to the valve:
FIG.2 -- MINIMUM MOUNTING CLEARANCE.
!
CAUTION
1. Installer must be a trained service technician.
2. DO NOT electrically operate the ML6984
before assembly to the valve because
damage not apparent to the installer may
occur.
1. The drive shaft of the ML6984 has a threaded hole to
link with the valve stem. Slide the yoke over the valve
bonnet (Fig. 4)
2. Thread the ML6984 drive shaft onto the valve stem
all the way, until it is completely attached (with no
threads showing), by turning the valve actuator in a
clockwise direction, as viewed from above
(depending on the valve models, use a pin or wrench
to keep valve stem from turning). Note that the valve
actuator is shipped with drive shaft in the mid­
position.
3. Care should be exercised when using tools on the
valve stem during tightening. (Fig.4) DO NOT
damage the threads or other parts of the stem.
4. Orient the conduit hole to the most desirable
direction, then tighten the LOCKNUTS on the U-bolt.
3
ML6984 DIRECT COUPLED VALVE ACTUATOR
FIG. 4 -- ASSEMBLY OF ML6984A TO VALVE.
FIG.3 -- PREPARATION FOR VALVE ASSEMBLY.
5. Remove the plastic cover from the ML6984 by loosening
the two screws located on the top (Note: These screws
are captive. Rotate three complete revolutions to remove
cover ). Drop either Slot Headed or Allen Hex type of set
screw (both are included in the plastic bag ) into the top
of the shaft, slotted/ Hexed side up. Or use the set
screw from the valve stem button.
6. Depending on which type of set screw was used, with a
5 mm (3/16") Slotted screwdriver or 1/8"x 6" Allen
wrench (included in the plastic bag), tighten the set
screw to lock valve stem in place (Fig. 6).
!
or Allen Wrench
CAUTION
For proper valve operation, valve stem must be
threaded into the actuator all the way (with
no threads showing) and locked in place with
the set screw provided.
FIG. 5 -- U-BOLT ASSEMBLY.
FIG. 6. -- LOCKING ML6984A DRIVE SHAFT TO
VALVE STEM
4
ML6984 DIRECT COUPLED VALVE ACTUATOR
1
Typical Electronic Controller
3-wire control systems
L1
W
1
H
24 Vac
ML6984
3
T6
L2
R
C
3
B
Typical Electro-mechanical
Controller
1
L1
ML6984
W
24 Vac
R
L2
T5
3
T6
W
R
B
B
T5
2
Typical SPDT Controller
3
ML6984
W
W
1
T6
L1
5-wire control system
R
B
24 Vac
R
B
L2
T5
OR
3
ML6984
W
T6
+
28 Vdc
T6
T5
R
B
T5
!
CAUTION
In multiple actuators connection, power supply to all
actuators must be connected in a TRUE parallel
fashion to reduce excessive voltage drop. DO NOT
"daisy chain" i.e. connected to one actuator then
branched to another.
1
Allow 0.5 amps maximum for each device. Actuators and controller can share same transformer providing the
VA rating of the transformer is not exceeded and proper phasing is observed.
2
SPDT controller can be a low voltage Series 20 "on-off " or Series 60 "floating" (center-off) type.
3
For multiple actuators controlled by a common controller in parallel, these actuators must be wired so that they all
travel in the same direction.
Fig. 7 Wiring for ML6984 actuators
5
ML6984 DIRECT COUPLED VALVE ACTUATOR
Operation:
The recommended valve actuator power source is a
class 2, 24V transformer or 28Vdc across terminals
T5 &T6. Internal circuitry provides dc power for the
electronic sensing and drive motor circuits.
The motor is controlled by a microprocessor.
Connecting B to R tells the microprocessor to cause
the actuator to drive open. Connecting W & R will
cause the actuator to drive closed. For "floating"
control, if R remains open, the actuator will remain in
the last position.
At the end of the valve stroke, the actuator will
develop the necessary force for positive valve close­
off. As forces are developed, the current to the motor
increases. The microprocessor stops the actuator
automatically when the motor current, and forces
reach the predetermined level.
! CAUTION:
1. Disconnect power supply before beginning
installation to prevent electrical shock and
equipment damage.
2. All wiring must comply with applicable local
electrical codes, ordinances and regulations.
3. Make certain that the voltage and frequency of
the power supply correspond to the rating of
the device.
4. DO NOT electrically operate the ML6984
before assembly to the valve because
damage not apparent to the installer may
occur.
Home and Building
Control
Honeywell Limited/Limitee
155 Gordon Baker Road
North York , ON
Canada M2H 3N7
GENERAL NOTE:
For proper operation, voltage on the T5 & T6 must
not be less than 22Vac or 24Vdc during running or
force generating stages.
REPLACEMENT NOTE:
To replace ML684:
1. The new ML6984 is a direct replacement for the old
ML684A in single actuator or parallel multiple actuators
hook-up. The old and new actuators can be mixed in the
same electrical circuit. For multiple actuators controlled by
a common controller in parallel, these actuators must be
wired so that they all travel in the same direction.
2. When replacing the ML684A1009 (80 lbs ) with this new
ML6984 on the V5045 valve. The already installed valve
adaptor (part # 272629A) on the valve stem and actuator
assembly is still needed.
To replace ML6874:
1. The new ML6984 is a direct replacement for the old
ML6874 in single actuator hook-up.
2. For parallel multiple old ML6874 actuators applications,
an isolation relay must be used (isolation relay contacts
should be placed in the new ML6984 actuator signal input
"W" and "B" circuit).
Checkout:
1. Make sure the valve stem is completely screwed into the
actuator drive shaft with no threads showing.
2. Make sure the valve stem is locked in place with the set
screw.
3. With 24 Vac or 28Vdc power supply connected to T5 &
T6.
4. Jumper R & B. The valve stem should move up.
5. Jumper R & W. The valve stem should move down.
6. For Floating operation, open R connection. Valve stem
should remain in position.
7. Re-connect all control wiring.
8. Operate the system (valve, actuator and controller) for
several cycles to ensure proper installation.
9. When checkout is complete, return the controller to the
desired setting.
Home and Building
Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
By using this Honeywell literature, you agree that Honeywell will
have no liability for any damages arising out of your use or
modification to, the literature. You will defend and indemnify
Honeywell, its affiliates and subsidiaries, from and against any
liability, cost, or damages, including attorneys’ fees, arising out of,
or resulting from, any modification to the literature by you.
www.honeywell.com
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