Flowserve Limitorque L120 Series User manual

Experience In Motion
USER INSTRUCTIONS
Installation
Operation
Maintenance
Limitorque
®Actuation Systems L120 Series
For L120-10 through L120-40
FCD LMENIM1201-05-A4 – 03/18

Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
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Contents
1 Introduction 4
1.1 Purpose 4
1.2 User Safety 4
2 Product Inspection - Storage - Identification 5
2.1 Inspection and Recording 5
2.2 Short-Term Storage (less than 1 year) 5
2.3 Product Identification 7
3 Actuator Weights 8
4 Installation Instructions 9
4.1 Safety Precautions 9
4.2 Safety Practices 10
4.3 Initial Actuator Preparation 10
4.3.1 Mounting Base 10
4.3.2 Stem Acceptance 10
4.4 Torque Switch 11
4.4.1 Setting Torque Switch 11
4.4.2 Balancing Torque Switch 12
4.5 Geared Limit Switch 12
4.5.1 Setting Limit Switch 12
4.5.2 Setting Procedure (Refer to Figure 4.2) 13
4.5.3 Combination of Contacts (Refer to Figure 4.2) 14
4.6 Position Indication 14
4.6.1 Local position indication 14
4.6.2 Remote Position Indication 15
4.7 Optional Side-Mounted Handwheel 16
5 Operation 19
5.1 Electrical Start-up 19

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5.2 Manual Operation 20
5.3 Motor Operation 25
5.4 Torque and Travel Limiting 25
6 Maintenance 26
6.1 Lubrication 26
6.1.1 Lubrication Inspection 26
6.1.2 Factory Lubricant 27
6.2 Minimum Lubricant Qualities Required 27
6.3 Disassembly and Reassembly 28
6.4 Disassembly of the L120-10, 20, and 40 28
6.5 Drive Sleeve and Housing Cover Disassembly 29
6.6 Torque Nut Disassembly (Drive 1 Option) 29
6.7 Thrust Base Disassembly (Drive 2 Option) 30
6.8 Stem Nut Replacement – Thrust Base Applications 30
6.9 Reassembly 31
6.9.1 Declutch Assembly (L120-10) 32
6.9.2 Declutch Assembly (L120-20/40) (Refer to Figure 6.3) 32
6.9.3 Install the Motor (Refer to Figure 5.2) 33
6.9.4 Lubrication Procedure 33
6.9.5 Install Geared Limit Switch, Torque Switch and Finish Assembly 33
7 How to Order Parts 34
8 EC Declaration of Conformity 35

Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
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1 Introduction
Flowserve Limitorque actuators are available with a wide range of standard and optional features. Be
aware of these features and their role in the setup and operation of the actuator.
1.1 Purpose
This Installation and Maintenance Manual explains how to install and maintain the L120-10, L120-20,
and L120-40 actuators. Information on installation, disassembly, reassembly, lubrication, and parts is
provided.
1.2 User Safety
Safety notices in this manual detail precautions the user must take to reduce the risk of personal injury
and damage to the equipment. The user must read and be familiar with these instructions before
attempting installation, operation, or maintenance. Work to be performed on the actuator should be
carried out by a qualified tradesman familiar with the operation and maintenance of electric actuators.
Failure to observe these precautions could result in serious bodily injury or death, damage to the equip-
ment, voiding of the warranty, or operational difficulty.
Safety notices are presented in this manual in three forms:
cWARNING: Refers to personal safety. Alerts the user to potential danger. Failure to follow warning
notices could result in personal injury or death.
aCAUTION: Directs the user’s attention to general precautions that, if not followed, could result in
personal injury and/or equipment damage.
NOTE: Highlights information critical to the user’s understanding of the actuator’s installation and
operation.

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cWARNING: Read this Installation and Maintenance Manual carefully and completely before
attempting to install the actuator. Be aware of the electrical hazards.
2.1 Inspection and Recording
Upon receipt of the actuator, inspect the condition of the equipment and record nameplate
information:
1. Carefully remove actuator from shipping carton or skid. Thoroughly examine the
equipment for any physical damage that may have occurred during shipment. If
damaged, immediately report the damage to the transport company.
2. Record the actuator nameplate information for future reference; i.e. ordering parts,
obtaining further information.
2.2 Short Term Storage Procedures (less than 1 year)
NOTE: The following are our recommended storage procedures to retain maximum product integrity
during short-term storage. Failure to comply with recommended procedures will void the warranty. For
longer-term storage, contact Limitorque for procedures and recommendations.
Actuators are not weatherproof until properly installed on the valve or prepared for storage.
Store actuators in a clean, dry, protected warehouse away from excessive vibration and rapid tempera-
ture changes. If the actuators must be stored outside, they must be stored off the ground, high enough
to prevent them from being immersed in water or buried by snow.
1. Position the actuator in storage with motor and switch compartment horizontal.
2. Connect the internal heaters (if supplied) or place desiccant in the switch compartment.
3. Replace all plastic caps or plugs with pipe plugs and ensure that all covers are tight.
4. If the actuator is mounted on a valve and the stem protrudes from the unit, a suitable stem cover
must be provided.
Product Inspection - Storage -
Identification

Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
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Figure 2.1 – L120-10 through 40
Motor
Limit Switch/
Controls
Compartment
Housing
Declutch
Lever
Handwheel
Actuator
Nameplate
(hidden)

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2.3 Product Identification
The actuator unit nameplate is located on the back of the unit, opposite the limit switch compartment.
The nameplate contains the following information:
• Limitorque name
• Point of Manufacture
• Unit Size
• Order Number
• Serial Number
• Customer Tagging
• CE Stamp
The motor nameplate is located on the motor. The nameplate contains the following information:
• ID Number
• Start Torque
• Run Torque
• Enclosure Type
• RPM
• Volts
• Full Load Amps
• Locked Rotor Amps
• Insulation Class
• Duty
• Horsepower
• Service Factor
• Phase
• Cycles
• Motor Code
• Ambient Temperature
• Connection Diagram

Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
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3 Actuator Weights
The approximate L120 actuator weights are provided below:
Table 3.1 – Actuator weights
Actuator
Size Control Types
Drive 1 Weight (lb./kg) Drive 2 Weight (lb./kg)
Top HW Side HW Top HW Side HW
lb. kg lb. kg lb. kg lb. kg
L120-10
NCU 100 45 112 51 107 49 119 54
BIC 115 52 127 58 122 55 134 61
CLAMSHELL 140 64 152 69 147 67 159 72
L120-20
NCU 140 64 158 72 153 69 171 78
BIC 155 70 173 78 168 76 186 84
CLAMSHELL 180 82 198 90 193 88 211 96
L120-40
NCU 190 86 216 98 212 96 238 108
BIC 205 93 231 105 227 103 253 115
CLAMSHELL 230 105 256 116 252 114 278 126
Note: Approximate weights are based on standard explosion-proof construction, with the largest
three-phase motor available for the model size.

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4 Installation Instructions
4.1 Safety Precautions
cWARNING: Read this Installation and Maintenance Manual carefully and completely before attempting to install,
operate, or troubleshoot the Limitorque actuator.
cWARNING: Be aware of electrical hazards. Turn off incoming power before working on the actuator and before
opening the switch compartment.
cWARNING: Potential HIGH PRESSURE vessel — be aware of high-pressure hazards associated with
the attached valve or other actuated device when installing or performing maintenance on the actuator.
For maintenance and/or disassembly of the actuator while installed on the valve, or removal of the actuator from
the valve or actuated device, ensure that the actuator is not under thrust or torque load. If the valve must be left
in service and under load, the valve stem must be locked in such a way as to prevent any movement of the valve
stem.
cWARNING: Do not attempt to remove the spring cartridge cap, housing cover, or thrust base from the actuator
while the valve or actuated device is under load.
cWARNING: Do not manually operate the actuator with devices other than the installed handwheel and declutch
lever. Using force beyond the ratings of the actuator and/or using additive force devices such as cheater bars,
wheel wrenches, pipe wrenches, or other devices on the actuator handwheel or declutch lever may cause
serious personal injury and/or damage to the actuator and valve.
cWARNING: Do not exceed any design limitations or make modifications to this equipment without first
consulting Limitorque.
cWARNING: Actuators equipped with electrical devices (motors, controls) requiring field wiring must be wired
and checked for proper operation by a qualified tradesman.
cWARNING: Use of the product must be suspended any time it fails to operate properly
aCAUTION: Do not use oversized motor overload heaters. Instead, look for the cause of the overload.
aCAUTION: Do not operate the valve under motor operation without first setting or checking the limit switch
setting and motor direction.
aCAUTION: Do not force the declutch lever into the motor operation position. The lever returns to this position
automatically when the motor is energized.
aCAUTION: Do not depress the declutch lever during motor operation to stop valve travel.
aCAUTION: Do not use replacement parts that are not genuine Flowserve Limitorque parts, as serious personal
injury and/or damage to the actuator and valve may result.
aCAUTION: Eye bolts may be used to lift the actuator for installation on the valve or actuated device. Do not lift
actuator/valve or actuator/gearbox combinations using eye bolts in the L120 actuator.
aCAUTION: Do not lift the actuator by the handwheel.

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4.2 Safety Practices
The following checks should be performed to maintain safe operation of the L120 actuator.
• Mount motors on a horizontal plane, if possible.
• Keep the controls compartment clean and dry.
• Keep the valve stem clean and lubricated.
• Set up periodic operating schedule for infrequently used valves.
• Carefully check for correct motor rotation direction. If the motor is driving the valve in the wrong
direction, interchange any two leads on three-phase motors or switch the armature leads on DC and
single-phase motors.
• Use a protective stem cover. Check valve stem travel and clearance before mounting covers on rising
stem valves.
• Verify all actuator wiring is in accordance with the applicable wiring diagram, national and local codes,
and Table 4.1.
Table 4.1 – Required Rating for External Wiring
Up to: Use wire rated at least:
40°C 60°C
60°C 75°C
4.3 Initial Actuator Preparation
Replace all molded plastic conduit and top protectors (installed for shipping purposes only) with pipe
plugs when installation wiring is complete.
4.3.1 Mounting Base
The mounting hole sizes and quantities are as detailed in Table 4.2.
Table 4.2 – Mounting Base Dimensions
Actuator Size Mounting Holes Tap size
Quantity MSS ISO
L120-10 43⁄8-16x0.88 M10x1.5x22.4
L120-20 45⁄8-11x1.25 M16x2x32
L120-40 45⁄8-11x1.25 M16x2x32
4.3.2 Stem Acceptance
The maximum stem acceptance is provided in Table 4.3.
Table 4.3 – Maximum Stem Acceptance
Actuator size
Drive 2 Drive 1
Tapped Bore Key
inch mm inch mm inch mm
L120-10 1.25 32 1.00 25 ¼x3/32 8x6
L120-20 2.25 57 1.875 47 ½x3/16 14x9
L120-40 2.625 66 2.125 52 ½x3/16 16x10

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4.4 Torque Switch
The torque switch is designed to protect the actuator in open and close directions.
aCAUTION: Disconnect all incoming power before opening limit switch compartment or working on
the torque switch.
• Do not use abrasive cloth to clean the contacts on the torque switch.
• Do not torque seat 90° operation valves nor run them against the stops. This may cause damage
to the valve.
NOTE: If the actuator has “torqued out,” release torque buildup by operating the actuator manually.
4.4.1 Setting Torque Switch
The torque switch was set at the factory according to customer-supplied information regarding neces-
sary torque or thrust output that was provided at the time of the order. However, if the setting needs to
be adjusted, perform the following procedure:
Item letters correspond to Figure 4.1.
1. Place the L120 actuator in manual mode.
2. Release the load on the wormshaft spring pack.
3. For open and close directions, loosen Screw (A) and move Pointer (B) to desired position. A higher
number indicates a high torque and/or thrust output.
4. Tighten Screw (A).
5. Operate the valve electrically to seat valve and to ensure tight shutoff.
6. Rebalance torque switch if required.
aCAUTION: A torque switch limiter plate is provided on most actuators.
• Removal or modification of the torque switch limiter plate will void the actuator warranty.
• Do not exceed the setting indicated by this plate without contacting the Limitorque service
department.
• Installing or adjusting the torque switch with the actuator in a loaded condition will result in a loss
of torque protection.
Figure 4.1 – Microswitch-Style Torque Switch and 300 Volt Torque Switch
Mounting
Screw
Index Marks
Maximum Stop
Setting Plate
A
B
Balancing
Screws
300 Volt Torque Switch
AB
BA
BA
Microswitch-Style Torque Switch
Mounting
Screw
Index Marks
Maximum Stop
Setting Plate
Balancing
Screws
-10-20
CLOSE
OPEN
-10-20

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4.4.2 Balancing Torque Switch
Item letters correspond to Figure 4.1.
1. Place the actuator in manual mode.
2. Remove the load from the wormshaft spring pack.
3. Note the open and close torque switch settings prior to reinstalling the torque switch.
4. Loosen Screws (A) and position both Pointers (B) at the #1 setting, tighten Screw (A). In this
position the index marks should be aligned.
5. Loosen balancing screws and install the torque switch. The base of the torque switch should be
flush against the compartment and the hole for the mounting screw should be aligned.
6. Install the mounting screw.
7. Tighten the balancing screws.
aCAUTION: The balancing screws should not be touched except during the balancing procedure.
The switch is now balanced and ready for the pointers to be returned to their original settings.
4.5 Geared Limit Switch
aCAUTION: The geared limit switch is not preset at the factory and must be adjusted after the
actuator has been mounted on associated equipment.
• Disconnect all incoming power to the actuator prior to opening the limit switch compartment and
adjusting the switch.
• Consult the relevant wiring diagram for limit switch contact development. All L120 units are
supplied with 16-contact limit switches - four switches on each of the four rotors. Two rotors are
used for end of travel indication. The remaining two rotors may be adjusted for any intermediate
point of travel.
• Do not use abrasive cloth to clean the contacts on the limit switch.
• Do not attempt to repair gearing in the limit switch. Replace entire gear frame assembly if
necessary.
4.5.1 Setting Limit Switch
Set the limit switch as follows. All item letters and piece numbers refer to Figure 4.2.
NOTE: See chart below for maximum number of drive sleeve turns for each unit size. The Intermediate
Shaft (B), shown in Figure 4.2, may take a considerable number of turns before rotor trip occurs.
Table 4.4 – Maximum Number of Drive Sleeve Turns for Standard Four-Gear and Optional Five-Gear
Limit Switches
Actuator Size Four-Gear Five-Gear
L120-10 630 6300
L120-20 740 7400
L120-40 640 6400

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cWARNING: Potential Explosion Hazard. Do not use a variable speed electric drill for setting the limit
switch in an explosive environment.
aCAUTION: When setting the limit switch rotor segments (cams) using a variable speed electric drill,
do not run drill at speeds higher than 200 RPM. Operating the drill at high speeds can damage the
gearing within the limit switch.
Figure 4.2 – Limit Switch
4.5.2 Setting Procedure (Refer to Figure 4.2)
1. Open the Compartment Cover (piece #200 of Figure 5.2).
2. Put the actuator into manual operation. Use the handwheel to operate the valve in the “open” direc-
tion. While operating the valve, note the direction of the Intermediate Shaft (B) corresponding to the
rotor or rotors to be set.
3. When the valve is fully open, close it one turn of the handwheel to allow for coast of moving parts
or refer to the valve manufacturer setting requirements.
4. Push in the Setting Rod (A) and turn one-quarter turn. The rod will latch in this depressed position.
5. Refer to the applicable wiring diagram for contact development. The limit switch contact is closed
when the rotor is engaged with the plunger. If the rotor to be set has not turned 90 degrees to
operate the plunger, turn the intermediate shaft in the same direction as noted in Step 2 until the
rotor clearly trips the switches. This rotor is now set correctly.
6. Before moving the valve, depress and turn the Setting Rod (A) one-quarter turn to the spring
released position. Insert a screwdriver into the intermediate shafts to ensure that they will not move.
aCAUTION: Do not operate the valve when Setting Rod (A) is in a fully depressed position. Loss of
contact setting will occur and the setting rod will be damaged.
7. Operate the valve by handwheel to fully “close” position; reverse direction by one turn of the hand-
wheel to allow for coast of moving parts or refer to the valve manufacturer setting requirements.
8. Set the other rotors by following Steps 4 through 6.
1
2
9
3
4
B
A
6
5
7
8
Piece Quantity Description
11 Gear Frame Assembly
22 Eight-Switch Contact Block Assy.
312Rotor Segment (short)
44 Rotor Shaft
54 Machine Screw
64 Flat Washer
74 Lock Washer
88 Hex Nut
94 Rotor Segments (long)

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Figure 4.3 – Setting the open and closed contacts
4.5.3 Combination of Contacts (Refer to Figure 4.2)
The rotor segments can be separated and rotated through 90 degrees to give various combinations of
normally open or normally closed contacts to each rotor.
1. Remove Nuts (piece 8) and Fillister Head Machine Screws (piece 5, for a total of two fasteners on
each side of the switch).
2. Remove complete contact assembly from the back plate.
3. Rearrange cams on the camshaft to produce the required combination of contacts.
4. Replace contact assembly on back-plate (ensuring that the registers fit correctly) and secure with
the machine screw and nuts.
5. Set limits according to the procedure above.
4.6 Position Indication
4.6.1 Local position indication
The local dial position indicator is factory-selected to show valve position. The position indicator can
only be adjusted when mounted on the valve.
To set the local position indicator:
1. Disconnect all incoming power and remove Switch Compartment Cover (piece 200 of Figure 5.2).
2. Place the valve in the fully “close” position.
3. Loosen the round head machine screw which holds the pointer in place, move the pointer to the “O”
position, and retighten the screw.
The indicator is now set.
Closed
position
Open
position

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NOTE: The end-of-travel rotors of the geared limit switch activate “Flip-flop” type indicators. This type of
indicator will require no further setting after the geared limit switch has been adjusted.
4.6.2 Remote Position Indication
The L120 actuator with a position transmitter installed, transmits a 4-20 mA output signal to a remote
position indicator. The transmitter responds to input of a 1K (ohms) potentiometer and can
be powered by 18 VAC or 24 VDC.
NOTE: The pinion has been left disengaged to prevent damaging of rheostat prior to setting the valve.
Set rheostat by turning pinion until the desired reading is obtained. Loosen the hex nut on the back of
the rheostat and slide the rheostat in the direction of the idler pinion until pinions are engaged. Do not
force engagement of the pinions. Retighten hex nut on back of the rheostat. Do not engage pinion until
unit and valve have been set.
To Calibrate Position Transmitter
1. Position the actuator to mid-travel: valve at 50% position.
2. Disconnect the potentiometer wiring harness from the transmitter board and measure the resis-
tance from each end connection to the center connection on the potentiometer.
3. Set the potentiometer to the correct resistance reading. Loosen the set screw that retains the spur
gear on the potentiometer shaft and rotate the shaft until a reading of 500 ohms is achieved.
4. Tighten the set screw and reconnect the wiring harness.
5. Run the actuator fully CLOSED.
6. Calibrate ZERO position by adjusting the zero potentiometer until a 4 mA output signal is read at
terminal +VE and -VE.
7. Run the actuator fully OPEN.
8. Calibrate SPAN position by adjusting the span potentiometer until a 20 mA output signal is read at
terminals +VE and -VE.
9. Repeat steps 5 to 8 and fine-tune as necessary.
Figure 4.4 – 1000 ohm Potentiometer
DC Power
Supply
-
+
-
+
Receiver
Gearing
1000 ohms
Customer Equipment
Typical Connection for a 1000 ohm Potentiometer

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4.7 Optional Side-Mounted Handwheel
For actuator sizes L120-10, 20, and 40, the handwheel can be mounted on the side as shown in the
following figures.
Figure 4.5 – L120-10 parts list, attachment ratio 4.2:1
Piece Quantity Description
61Housing Cover Shim
42-11 1 O-Ring / Handwheel Mounting
44 1 Quad Ring
45 1 Pipe Plug
1501Bevel Housing
1511Bevel Housing Adapter
1521Bearing Cap
1531Bevel Gear
1541Bevel Pinion Shaft
157-1 4 Hex Head Cap Screw
157-2 4 Lockwasher
157-3 2 Socket Head Cap Screw
157-4 1 Roll Pin
157-5 2 Socket Head Cap Screw
157-6 2 Lockwasher
158-1 1 Quad Ring
158-2 1 O-Ring
158-3 1 O-Ring
158-4 1 Quad-Ring
160 2 Ball Bearing
161 1 Seal Insert
164 1 Spacer
169 1 Retaining Ring
171 1 Grease Fitting
177 1 Handwheel
178 1 Hex Head Cap Screw
179 1 Lockwasher
180 1 Key
181 1 Retaining Washer
182-1 1 Handwheel Spinner
182-2 1 Socket Head Cap Screw
182-3 1 Hex Jam Nut
157-1
&
157-2
150158-2 151
45
153 642-11
44
158-4
164
Note: Apply Loctite 601/609
to ID of Bearing Cap
152
169
161
158-1
158-3
160
171
182-2
182-1
182-3
178 &
179 181 180 177
154
157-4
157-3
&
157-6
157-5

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Figure 4.6 – L120-20 with side-mounted handwheel and parts list, attachment ratio 5.7:1
154
150 151
45
153 6 42-11
158-4
158-2
Note: Apply Loctite 601/609
to ID of Bearing Cap
152
169
161
158-1
158-3 160
171
44
182-2
182-1
182-3
179
&
178 181 180
157-5
157-3
&
157-4
157-6
177
157-1
&
157-2
Piece Quantity Description
6 1 Housing Cover Shim
42-11 1 O-Ring / Handwheel Mounting
44 1 Quad Ring
45 1 Pipe Plug
150 1 Bevel Housing
151 1 Bevel Housing Adapter
152 1 Bearing Cap
153 1 Bevel Gear
154 1 Bevel Pinion Shaft
157-1 4 Hex Head Cap Screw
157-2 4 Lockwasher
157-3 4 Hex Head Cap Screw
157-4 4 Lockwasher
157-5 1 Roll Pin
157-6 2 Socket Head Cap Screw
158-1 1 Quad-Ring
158-2 1 O-Ring
158-3 1 O-Ring
158-4 1 Quad Ring
160 1 Ball Bearing
161 1 Seal Insert
169 1 Retaining Ring
171 1 Grease Fitting
177 1 Handwheel
178 1 Hex Head Cap Screw
179 1 Lockwasher
180 1 Key
181 1 Retaining Washer
182-1 1 Handwheel Spinner
182-2 1 Socket Head Cap Screw
182-3 1 Hex Jam Nut

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Figure 4.7 – L120-40 with side-mounted handwheel and parts list, attachment ratio 12:1
Handwheel
182-2
182-1
182-3
179
&
178 181 180
157-3
&
157-4
157-7
155
163
164
Note: Apply Loctite
601/609 to ID of
Bearing Cap
169
161
158-1
159
177
167
160
164
Section Through Pinion
154
157-5
157-1
&
157-2
158-2
150 44
6
42-11
45
156
153
158-4
171
171
157-6 152
158-3
151
158-5
Piece Quantity Description
61 Housing Cover Shim
42-11 1 O-ring / Handwheel Mounting
44 1 Quad Ring
45 1 Pipe Plug
150 1 Bevel Housing Cover
151 1 Bevel Housing
152 1 Spur Gear Cover
153 1 Bevel Gear
154 1 Bevel Pinion
155 1 Input Pinion Shaft
156 1 Bevel Gear Adapter
157-1 4 Hex Head Cap Screw
157-2 4 Lockwasher
157-3 4 Hex Head Cap Screw
157-4 4 Lockwasher
157-5 8 Socket Head Cap Screw
157-6 2 Dowel Pin
157-7 1 Socket Head Cap Screw
158-1 1 Quad Ring
158-2 1 O-ring
158-3 1 Gasket
158-4 1 Quad Ring
158-5 1 O-ring
159 1 Spur Gear
160 1 Ball Bearing
161 1 Seal Insert
163 1 Ball Bearing
164 2 Ball Bearing
167 1 Key
169 1 Retaining Ring
171 1 Grease Fitting
177 1 Handwheel
178 1 Hex Head Cap Screw
179 1 Lockwasher
180 1 Key
181 1 Retaining Washer
182-1 1 Handwheel Spinner
182-2 1 Socket Head Cap Screw
182-3 1 Hex Jam Nut

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5 Operation
cWARNING: Do not manually operate the actuator with devices other than installed Handwheel and
Declutch Lever. Using force beyond the ratings of the unit and/or using additive force devices such
as cheater bars, wheel wrenches, pipe wrenches or other devices on the actuator Handwheel or
Declutch Lever may cause serious personal injury and/or damage to the actuator or valve.
aCAUTION: Do not motor-operate the valve without first setting or checking the limit switch setting
and motor direction.
• Do not force the declutch lever into hand operation. If the clutch does not easily engage, rotate
handwheel slowly while operating the declutch lever.
• Do not alternately start/stop the motor to open or close a valve which is too tight for normal
operation.
5.1 Electrical Start-up
1. Verify that the actuator has been correctly lubricated. This is particularly important if the actuator
has been in long-term storage.
2. Verify that the geared limit switch has been correctly set (see Section 4.5.1, Setting Limit Switch).
3. If the valve stem is not visible, remove the stem cover or handwheel cover plate to observe output
direction of the drive sleeve.
4. Engage manual operation and hand crank the valve well away from end of travel positions.
5. Turn on power supply and push button to “open.”
6. Check output rotation:
• If phase rotation is correct, the valve should begin to open.
• If valve begins to CLOSE, STOP immediately. Incorrect phase rotation will lead to serious damage
if the valve seats.

Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
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7. Correct the phase rotation one of two ways:
• Switch any two of the three power leads for three-phase power, or
• Reverse the armature leads for single-phase or DC power.
The actuator should operate correctly and will be stopped at the end of travel positions by torque or limit
switch functions.
Table 5.1 – Required Rating for External Wiring
Up to Use wire rated at least
40°C 60°C
60°C 75°C
Figure 5.1 is a representation of a typical application and may not be applicable to your specific actuator.
Please refer to the wiring diagram supplied with your actuator to confirm the actual
equipment supplied.
5.2 Manual Operation
Piece numbers refer to Figure 5.2.
Counterclockwise rotation of the Declutch Lever (piece 9) causes the declutch actuator to lift the clutch
sleeve out of engagement with the worm gear. Drive lugs on top of the clutch sleeve engage matching
lugs in the Handwheel Adapter (piece 26) and then latches engage the clutch sleeve in this position. The
actuator is now in the handwheel driving option. Energizing the motor at this point will cause the latches
to drop out and the spring-loaded clutch sleeve reengages with the lugs on the worm gear. The actuator
is once more in motor operation.
NOTE 1: The shift from manual operation to motor operation is automatic and does not require external
positioning of the declutch shaft.
NOTE 2: If the declutch mechanism does not engage, rotate handwheel approximately 30-45° and
attempt manual engagement. There is a chance that the lugs on the Clutch Sleeve (piece 19) and
Handwheel Adapter (piece 26) are not correctly aligned.