Honeywell ML6874 User Manual

ML6874  
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  
• Field-configurable DIP switches for  
Direct/Reverse action  
• 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  
GENERAL  
The ML6874 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) or Series 60 (floating) controllers.  
Contents  
Specifications..........................................2  
Order information................................... 2  
Installation.............................................. 3  
Wiring Schematics..................................5  
Operation and Checkout.........................6  
PCY 02/98  
©
Honeywell Ltd. 1998 Printed in Canada  
95C-10865  
ML6874  
SPECIFICATIONS •INSTALLATION  
FIG. 1 -- DIMENSIONS OF ML6874 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 ML6874 is mounted above the valve  
body. This will minimize the risk of damage to the  
ML6874 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 ML6874 to the valve:  
1. The drive shaft of the ML6874 has a threaded hole to link  
with the valve stem. Slide the yoke over the valve bonnet  
(Fig. 4)  
2. Thread the ML6874 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.  
FIG.2 -- MINIMUM MOUNTING CLEARANCE.  
CAUTION  
1. Installer must be a trained service technician.  
2. DO NOT electrically operate the ML6874  
before assembly to the valve because damage  
not apparent to the installer may occur.  
!
4. Orient the conduit hole to the most desirable direction, then  
tighten the LOCKNUTS on the U-bolt.  
3
ML6874  
INSTALLATION  
FIG.3 -- PREPARATION FOR VALVE ASSEMBLY.  
FIG. 4 -- ASSEMBLY OF ML6874A TO VALVE.  
5. Remove the plastic cover from the ML6874 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.  
OR  
Allen Wrench  
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).  
!
WARNING  
g
FIG. 6. -- LOCKING ML6874A DRIVE SHAFT TO  
VALVE STEM  
FIG. 5 -- U-BOLT ASSEMBLY.  
4
ML6874  
WIRING  
3
SPDT  
Controller  
2
ML6874  
1
W
T6  
T5  
W
L1  
L2  
R
B
24 Vac  
R
B
OR  
2
ML6874  
+
T6  
T5  
W
T6  
28 Vdc  
W
R
B
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 actutator then branched to another.  
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.  
1
2
3
Use configuration DIP switches to select device functions: Direct acting function (actuator stem moves upwards  
with R & B closed ) or Reverse acting function ( actuator stem moves downwards with R & B closed ). DO NOT  
reverse wiring.  
SPDT controller can be a low voltage Series 20 "on-off " or Series 60 "floating" (center-off) type.  
Configuration  
DIP switches  
located adjacent  
to the input  
FUNCTION  
Direct Acting Mode  
DIP SWITCH CONFIGURATION  
on  
off  
on  
1
1
2
2
3
3
4
4
terminal block  
Reverse Acting Mode  
off  
NOTE:  
Turn power off before setting the DIP switches.  
Fig. 7 Wiring for SPDT controller to ML6874 actuators  
5
ML6874  
OPERATION AND CHECKOUT  
Operation and checkout  
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.  
REPLACEMENT NOTE:  
1. The old ML684 actuators cannot be used with new  
ML6874 valve actuators in the same circuitry, unless they  
are isolated by an isolation relay to prevent cross-talking.  
2. The ML6874 is a direct replacement for the old  
ML684A1025 (160 lbs) in single actuator hook-up,  
except when replacing the old reverse acting models, the  
signal input wires to the new devices are no longer  
needed to be reversed. Just set the DIP switch as shown in  
Fig.7.  
The motor is controlled by a microprocessor. Connecting  
B to R tells the microprocessor to cause the actuator to  
drive open, i.e. UP, in the Direct Acting Mode.  
Connecting W & R will cause the actuator to drive closed,  
i.e. DOWN, in the Direct Acting Mode. For "floating"  
control, if R remains open, the actuator will remain in the  
last position. The DIP switches are scanned only on power  
up, and tell the microprocessor if Direct or Reverse mode  
is desired. Changes in the DIP switch setting will only  
take effect if the power is off while the change is made.  
3. DO NOT replace the ML684A1009 (80 lbs ) with this  
new ML6874 on the V5045 valve.  
Checkout:( see General & Replacement Note )  
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.  
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.  
3. Check DIP switches for proper setting for Direct or  
Reverse Acting mode.  
4. Connect R & B. Valves stem should move up, in Direct  
Acting mode.  
5. Connect R & W. Valves stem should move down, in  
Direct Acting mode.  
6. For Floating operation, open R connection. Valve stem  
should remain in position.  
7. Operate the system ( valve, actuator and controller ) for  
several cycles to ensure proper installation.  
8. When checkout is complete, return the controller to the  
desired setting.  
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 connect 24 Vac between any signal input  
terminals.  
!
5. DO NOT electrically operate the ML6874 before  
assembly to the valve because damage not apparent  
to the installer may occur.  
GENERAL NOTE:  
1. For correct valve operation, the ML6874 must be field  
configured with the DIP switches which are located  
beside the terminal block, see wiring diagrams for  
details. Turn power off before setting the DIP  
switches .  
2. There is a short delay in actuator response upon every  
signal change. It is to screen any unwanted incoming  
signals.  
3. For proper operation, voltage on the T5 & T6 must not  
be less than 22Vac or 24Vdc during running or force  
generating stages.  
Home and Building Control  
Honeywell Limited/Limitee  
155 Gordon Baker Road  
North York , ON  
Home and Building Control  
Honeywell Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Helping You Control Your World  
Canada M2H 3N7  

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