Flowserve LY User Manual

USER INSTRUCTIONS

Limitorque LY Series:
LY 1001, LY 2001 and LY 3001

FCD LMENIM1501-00 – 11/11

50

100

0

L i m i t o r q u e

Installation

Operation

Maintenance

Experience In Motion

Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Contents

1 Introduction 5

1.1 Purpose 5

1.2 User Safety 5
2 Product Capabilities and Features 6
3 Initial Inspection and Storage Instructions 7

3.1 Product Identification 7

3.2 Inspection and Recording 8

3.3 Storage Procedures 8

3.3.1 Short-Term Storage (less than 1 year) 8

3.3.2 Long-Term Storage (1 to 5 years) 8
4 Actuator Weights 10
5 Installation Instructions 11

5.1 Safety Precautions 11

5.2 Safety Practices 12

5.3 Initial Actuator Preparation 12

5.4 Installation Overview 14

5.5 Torques Switch Settings 18

5.6 Rewiring the Torque Switch for Non-Standard Drive Sleeve Rotation 18

5.7 Limit Switch and Mechanical Stop Settings 19

5.8 Setting the Limit Switches 19

5.8.1 Setting the CLOSED Limit Switch 19

5.8.2 Setting the OPEN Limit Switch 21

5.9 Mechanical Stops 22

5.9.1 Setting the CLOSED Mechanical Stop on the LY 1001 22

5.9.2 Setting the CLOSED Mechanical Stop on the LY 2001/3001 23

5.9.3 Setting the OPEN Mechanical Stop on the LY 1001 24

5.9.4 Setting the OPEN Mechanical Stop on the LY 2001/3001 24

5.10 Setting the MDPI (Mechanical Dial Position Indicator) 24

5.10.1 Setting the Potentiometer 25
6 Operation 27

6.1 Typical LY 1001 Operation 27

6.2 Verify Correct Motor Rotation (Phasing) and OPEN/CLOSE Pushbutton Operation 27

6.2.1 Three-Phase Motor 28

6.2.2 Single-Phase Motor 32

6.2.3 DC Motor 36

6.3 Electrical Startup 36

6.4 Manual Operation 37

6.5 Motor Operation 37

7 Maintenance 45

7.1 Lubrication 45

7.1.1 Lubrication Inspection 45

7.1.2 Factory Lubricant 46

7.2 Minimum Lubricant Qualities Required 46

7.3 Disassembly and Reassembly 46

7.3.1 LY 1001 Disassembly 46

7.3.2 LY 1001 Reassembly 48

7.3.3 LY 2001/3001 Disassembly 50

7.3.4 LY 2001/3001 Reassembly 52

7.4 Troubleshooting 55
8 Parts List 58
9 How to Order Parts 61
10 Regulatory Information 62

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Limitorque LY Series: LY1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Figures

Figure 2.1 – LY Actuator 6
Figure 3.1 – LY Nameplate 7
Figure 5.1 – Torque Nut and Retaining Drive Ring Removal from an LY 1001 12
Figure 5.2 – LY Keyway Locations 13
Figure 5.3 – LY 1001, 2001, and 3001 Torque Drive Nut Orientation 15
Figure 5.4 – Removing Control Cover and Conduit Pipe Plugs 16
Figure 5.5 – Grounding Lug Location 17
Figure 5.6 – Reversing Torque Switch Wiring 18
Figure 5.7 – Limit Switch Setting Nut 20
Figure 5.8 – Setting CLOSE Limit Cam 20
Figure 5.9 – Setting OPEN Limit Cam 21
Figure 5.10 – Mechanical Stop Set Screw Adjusted to Torque Nut Contact Point on LY 1001 22
Figure 5.11 – Mechanical Stop Set Screw Adjusted to Torque Nut Contact Point on LY 2001 and 3001 23
Figure 5.12 – Aligning MDPI with Dial Window Retaining Plate 25
Figure 5.13 – Potentiometer Calibration Components 26
Figure 6.1 – Standard Actuator/Three-Phase 29
Figure 6.2 – Three-Phase with Control Package 30
Figure 6.3 – Standard Actuator/Single-Phase 33
Figure 6.4 – Single-Phase with Control Package 34
Figure 6.5 – LY 1001 Cover and Associated Parts 38
Figure 6.6 – LY 1001 Top Plate and Associated Parts 39
Figure 6.7 – LY 1001 Housing and Associated Parts 40
Figure 6.8 – LY 2001/3001 Cover and Associated Parts 41
Figure 6.9 – LY 2001/3001 Top Plate and Associated Parts 42
Figure 6.10 – LY 2001/3001 Housing and Associated Parts 43
Figure 6.11 – LY 3001 Handwheel Assembly 44
Figure 7.1 – LY 1001 Declutch Return Spring Installation Position 48
Figure 7.2– LY 2001/3001 Declutch Return Spring Installation Position 52

Tables

Table 4.1 – Actuator Weights 10
Table 5.1 – Mounting Base Dimensions 13
Table 5.2 – LY Actuator/Mounting Base Tap Sizes 16
Table 5.3 – Control Cover and Conduit Pipe Plug Hardware 16
Table 5.4 – LY Control Cover and Integral Control Cover Bolt Sizes and Torques 17
Table 5.5 – Mechanical Stop Set Screws 22
Table 5.6 – Mechanical Stop and Locknut Screw Sizes 23
Table 8.1 – LY 1001 Parts List 58
Table 8.2 – LY 2001/3001 Parts List 59

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Introduction

1.1 Purpose

This Installation and Maintenance Manual explains how to install and maintain LY actuators. Information
on installation, disassembly, 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. Failure to observe these precautions could result in
serious bodily injury, damage to the equipment, warranty void, or operational difficulty.

Safety notices are presented in this manual in three forms:

c WARNING: Refers to personal safety. Alerts the user to potential danger. Failure to follow

warning notices could result in personal injury or death.

a CAUTION: 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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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Product Capabilities and Features

The LY actuator controls the opening and closing travel of the valve and limits torque through the torque
switches provided. As a result, all valve-operating parts are protected from overload, improper seating,
and foreign obstructions.

LY actuators may be mounted on any size valve in almost any position or location.

Microprocessor-based control and monitoring devices are available for installation on your actuator.
Contact your local Limitorque distributor or Limitorque sales office for further information.

Figure 2.1 – LY Actuator (LY 1001 shown)

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100

0

L i m i t o r q u e

Position Indication Window

Control Cover

Housing

Conduit Adapter

6

Handwheel typically
clockwise turn to CLOSE
and counterclockwise
turn to OPEN

Declutch Lever

Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Initial Inspection
and Storage Instructions

3

c WARNING: Read this Installation and Maintenance Manual carefully and completely before

attempting to store the actuator. Be aware of electrical hazards within the actuator and high­pressure hazards of the attached valve or other actuated device when installing or performing
maintenance on your LY actuator.

3.1 Product Identification

The actuator unit nameplate is located on the side of the unit opposite the conduit entry. The
nameplate contains the following information:

• Limitorque name

• Point of Manufacture

• Unit Size

• Serial Number

• Order Number

• Electrical Power Supply

• Operating Time (seconds)

• Motor Full Load Amperage

• Connection diagram

Figure 3.1 – LY Nameplate (Reference Drawing 61-682-0108)

LETTERS TO BE LASER
ETCHED (SILVER)

LUBE

TAGGING

LY­ORDER
SERIAL
VOLT
OP. TIME

R

Limitorque

Lynchburg, VA. USA

PH
FLA

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

3.2 Inspection and Recording

Upon receipt of the actuator, inspect the condition of the equipment and record nameplate information
as follows:

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 unit nameplate information for future reference, i.e., ordering parts, and obtaining
further information.

3.3 Storage Procedures

NOTE: The following are Flowserve’s recommended storage procedures to retain maximum product
integrity during short-term and long-term storage. Failure to comply with recommended procedures will
void the warranty.

3.3.1 Short-Term Storage (less than 1 year)

Actuators should be stored in a clean, dry, protected warehouse, free from excessive vibration and rapid
temperature changes.

Preparation

1. Connect internal heaters, if supplied.

2. Replace all plastic caps or plugs with metal pipe plugs.

3. Ensure all covers are tight.

Outdoor Storage

If actuators must be stored outdoors, they must be stored off the ground, high enough to prevent being
immersed in water or buried in snow.

LY Storage Orientation

• Store with the Control Compartment Cover (Limit Switch compartment) facing upward.

• Do not store units on their side.

3.3.2 Long-Term Storage (1 to 5 years)

Actuators should be stored in a clean, dry, protected warehouse, free from excessive vibration and rapid
temperature changes.

NOTE: During long-term storage, the maximum source of equipment deterioration anticipated is
from possible condensation within the actuator enclosure. This condensation may occur with rapid
temperature changes in the storage environment. If reliable means are not available to prevent rapid
temperature changes, a heat source should be added in the electrical enclosure during storage. Consult
the Limitorque Customer Service Department for further information.

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Preparation

1. Connect internal heaters, if supplied.

2. Replace all plastic caps or plugs with metal pipe plugs.

3. Ensure all covers are tight.

LY Storage Orientation

1. Store with the Control Compartment Cover (Limit Switch compartment) facing upward. Do not
store units on their side.

2. Store off the floor on suitable skids and cover with an unsealed dust cover leaving the bottom open
and air holes in the side.

Storage Inspection and Correction

1. Perform a semi-annual visual inspection. A minimum inspection should include checking the
following:

 •Packaging  •Plugs

 •Covers  •Dryness

 •Cleanliness  •Heatsource(ifused)forproperfunctioning

2. Record and correct deficiencies noted during inspection.

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Actuator Weights

The approximate LY actuator weights are provided below.

Table 4.1 – Unit Weights

Unit Size Control Types

NCU 40 20

LY 1001

LY 2001

LY 3001

BIC 75 34
UEC 90 41
NCU 100 45

BIC 110 50
UEC 144 65
NCU 105 48

BIC 130 59
UEC 149 68

Weight

lb. kg

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Installation Instructions

5.1 Safety Precautions

c WARNING: Read this Installation and Maintenance Manual carefully and completely before

attempting to install, operate, or troubleshoot the Limitorque actuator.

c WARNING: Be aware of electrical hazards. Turn off incoming power before working on the

actuator and before opening the switch compartment.

c WARNING: 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. Do not remove the actuator mounting bolts from the valve or actuated device
unless the valve or device stem is secured or there is no pressure in the line.

c WARNING: For maintenance and/or disassembly of the actuator while installed on the valve,

ensure that the actuator is not under thrust or torque load. If the valve must be left in service,
the valve stem must be locked in such a way as to prevent any movement of the valve stem.

c WARNING: Do not manually operate the actuator with devices other than the installed hand-

wheel 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.

c WARNING: Do not exceed any design limitations or make modifications to this equipment

without first consulting Limitorque.

c WARNING: Actuators equipped with electrical devices (motors, controls) requiring field wiring

must be wired and checked for proper operation by a qualified tradesman.

c WARNING: Use of the product must be suspended any time it fails to operate properly.

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

a CAUTION: Do not operate the valve under motor operation without first setting or checking the

limit switch setting and motor direction.

a CAUTION: Do not force the declutch lever into the motor operation position. The lever returns to

this position automatically when the motor is energized.

a CAUTION: Do not depress the declutch lever during motor operation to stop valve travel.

a CAUTION: 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.

a CAUTION: Do not lift the actuator by handwheel.

5.2 Safety Practices

The following check points should be performed to maintain safe operation of the LY actuator:

• Keep the switch compartment clean and dry.

• Keep the valve stem clean and lubricated.

• Set up a periodic operating schedule for infrequently used valves.

• Verify all actuator wiring is in accordance with the applicable wiring diagram.

• Carefully check for correct motor rotation direction. If the valve closes when open button is pushed,

the motor leads may have to be reversed.

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5.3 Initial Actuator Preparation

Piece numbers refer to Figure 5.1.

1. Remove the Retaining Drive Ring (piece #165 or #109) and Torque Nut (piece #32) from actuator.

Figure 5.1 – Torque Nut and Retaining Drive Ring Removal from an LY 1001

L i m i t o r q u e

#32 Torque Nut

#165 (LY 1001)
#109 (LY 2001/3001)
Torque Nut Retaining Drive Ring

Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

2. If Torque Nut has been bored and keywayed by Limitorque, verify dimensions and keyway location
for proper compatibility with the valve stem.

3. If Torque Nut has not been bored and keywayed by Limitorque, it is provided solid (blank) to allow
customer to custom key and bore up to the maximum permissible sizes as listed in Table 5.1.

Table 5.1 – Mounting Base Dimensions

Unit Type and Size

LY 1001 1-1/8, dia (28 dia) 1/4 x 1/8, (6 x 3)

LY 2001/3001 2-3/8, dia (60 dia) 5/8 x 1/16 (15 x 7.5)

NOTE: Before keywaying, match the Torque Nut with the Valve Stem to ensure proper keyway location. Use the
Keyway Index Mark (LY 1001 only) for locating appropriate keyway location.

Maximum Bore

inch (mm)

Maximum Keyway

inch (mm)

Figure 5.2 – LY Keyway Locations

LY 2001/3001 Keyway
Location Positions

B

A

LY 1001 Keyway

A

Location Marks

D

B

C

To rque Nut

C

D

Stop Lug

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

5.4 Installation Overview

a CAUTION: Be sure to complete each step of the installation overview before electrically

operating your actuator. If the actuator is already mounted to a valve from the manufacturer,
verify that the actuator is mounted according to the following overview. Failure to follow the
installation procedures could result in personal injury and/or improper operation and could
cause damage to the equipment.

1. Mount Torque Nut (piece #32) in the actuator as shown in Figure 5.3 with the following alignment:

A. For LY 1001 – Stop Lugs facing the Actuator Mounting Adapter with index lines positioned to

face the Mechanical Stop Screws.

B. For LY 2001/3001 – Torque Nut axially aligned on the Drive Sleeve so that the bottom of the nut

is positioned inside the Actuator Mounting Base.

2. Insert the Retaining Drive Ring (piece #165 for LY 1001, piece #109 for LY 2001/3001) on the
Torque Nut (piece #32) to hold the Torque Nut in place in the actuator.

3. Mount the LY actuator on the mounting flange of the valve or other actuated equipment. High­strength (minimum SAE-Grade 5 120,000 psi tensile strength) hex head or socket head cap screws
with lockwashers are recommended. The actuator mounting tap quantities and thread sizes are
detailed in Table 5.2.

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Figure 5.3 – LY 1001, 2001, and 3001 Torque Drive Nut Orientation

#32 Torque
Nut

CCW to

Open

Torque Nut
Stop Lugs

Actuator
Mounting
Base

Valve
Stem

Actuator
Mounting

LY 1001

Adapter

Mechanical Stop

Setscrews

Closed

Open

B

A

D

C

Stop Lug
index lines
facing
Mechanical
Stop Screws

Top view
of LY 1001
Mechanical
Stops

CCW to

Open

LY 2001/3001

Actuator
Mounting
Base

#32 Torque

Nut

Valve
Stem

Actuator
Mounting
Adapter

Top view
of LY

2001/3001
Mechanical
Stops

Stop Pins
located
within
actuator
housing on the
Drive Sleeve Gear

Mechanical
Stop Screws

Closed

D

A

C

B

Open

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

Table 5.2 – LY Actuator/Mounting Base Tap Sizes

Unit Type

and Size

LY 1001 8

LY 2001/3001 8

Qty

English Metric

3/8-16 x

0.71 deep

5/8-11 x

1.26 deep

Tap Size

M10 x 1.5 mm x 25 mm deep

(Complies with F10 ISO

mounting flange criteria)

M16 x 2 mm x 35 mm deep

(Complies with F10 ISO

mounting flange criteria)

NOTE: Flowserve has supplied eight taps for the LY 1001, LY 2001, and LY 3001 in English/Metric
units to provide flexibility in mounting arrangements. A minimum of four securing bolts is required to
properly secure and retain torque reaction on these units.

c WARNING: HAZARDOUS VOLTAGE. No electrical power should be connected until all wiring

and limit switch adjustments have been completed. Once power is supplied to unit, exercise
caution if cover is not installed.

4. Remove the Control Cover (piece #3) and Conduit Pipe Plugs (piece #144).

Figure 5.4 – Removing Control Cover and Conduit Pipe Plugs

L i mi to r q u e

#3 Control Cover

16

#144 Conduit Pipe Plugs

Table 5.3 – Control Cover and Conduit Pipe Plug Hardware

Unit Type

LY 1001

(WP & XP)

LY 2001/3001 8

Control Cover Conduit Pipe Plug

Quantity Size Quantity Size

6 M8 x 40 mm 2

M12 x 50 mm (WP)

M12 x 55 mm (XP)

1" NPT Socket

Hex Head

2

1" NPT Socket

Hex Head

Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

5. Adjust the Limit Switches, Mechanical Stops, and Position Indication Dial following the procedures detailed
in Section 5.7, Limit Switch and Mechanical Stop Settings.

6. Connect the wiring to the terminal strips provided on the actuator. Refer to the wiring diagram supplied
with the actuator. “Fork-type” terminal connections are recommended.

7. Insert a Conduit Pipe Plug in the unused conduit entrance if the wiring that enters the actuator uses only
one conduit entrance.

NOTE:

a. Explosionproof actuators require approved “sealing fittings” installed in accordance with the

National Electric Code.

b. Submersible actuators require an approved “sealing fitting” in order to keep water from entering

the actuator.

8. Attach grounding wire to Grounding Lug (piece #141).

9. Verify motor rotation direction to ensure that the limit switch is wired properly for intended operation. (See
Section 6.2, Verify Correct Motor Rotation (Phasing) and OPEN/CLOSE Pushbutton Operation.)

Figure 5.5 – Grounding Lug Location

#141 Grounding Lug

To earth ground

10. Reinstall Control Cover (piece #3).

NOTE: Submersible actuators require tightening the Control Cover Bolts and Integral Control Cover Bolts to
a specified torque in order to maintain submersibility. (See Table 5.4 for specific torque settings.)

Table 5.4 – LY Control Cover and Integral Control Cover Bolt Sizes and Torques

Unit Type Control Cover Integral Compartment

LY 1001 M8 - 10 to 15 ft-lb M10 - 15 to 20 ft-lb

LY 2001/3001 M12 - 20 to 25 ft-lb M10 - 15 to 20 ft-lb

Unit is now ready for electrical operation.

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

5.5 Torque Switch Settings

c WARNING: HAZARDOUS VOLTAGE. Turn power OFF before opening the Electrical Compartment

Cover or making any adjustments to the Torque Switch.

a CAUTION: Installing or adjusting the Torque Switch with the actuator in a loaded condition will

result in loss of torque protection. Before adjusting or installing the Torque Switch, place the
actuator in MANUAL mode and turn the Handwheel in the direction necessary to release the
torque load on the Wormshaft Assembly.

NOTE: Removal or modification of the Torque Switch Limiter Plate will void the actuator warranty.
Do not exceed the torque setting indicated by the Torque Switch Limiter Plate without contacting the
Limitorque Service Department.

The LY unit is equipped with a do W to MEDIUM or HIGH by adjusting the Torque Switch Adjustment
Screw unless it is limited by the Limiter Plate. (See Figure 5.6 for Torque Switch Adjustment Screw
location.)

5.6 Rewiring the Torque Switch for Non-Standard
Drive Sleeve Rotation

a CAUTION: Double-check the wiring diagram to verify that the Torque Switch is wired appro-

priately for the application. The Torque Switch will not protect the valve from over-torque if the
Torque Switch is not wired properly for the application.

LY series actuators are typically supplied with a CCW Drive Sleeve rotation to open a valve. The Torque
Switch is marked OPEN (CCW) and CLOSE (CW) based upon CW Drive Sleeve rotation to close the
valve. The Mechanical Dial Position Indicator (MDPI) is typically mounted for CW rotation to indicate
the CLOSED position. If opposite Drive Sleeve rotation is required (CCW to close a valve), the following
Torque Switch modifications are required.

1. Turn all power to the actuator OFF.

2. Reverse the ID Limiter Plate.

3. Interchange OPEN Torque Switch wires 18 and 18C with CLOSED wires 17 and 17C. (Refer to the
wiring diagram for other Torque Switch wiring configurations.)

Figure 5.6 – Reversing Torque Switch Wiring

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Typical CLOSE-circuit
microswitch (17 &17C)

Typical OPEN-circuit
microswitch (18 &18C)

CLOSE

LY-1

H

M

L

OPEN

H
M
L

ID-Limiter Plate

Torque Switch
Adjustment Screws

Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

4. Remove the MDPI Plate and flip over for indication of CCW rotation to the valve’s closed position.
(See Figure 5.12 for MDPI Dial Plate.)

5.7 Limit Switch and Mechanical Stop Settings

The Limit Switch and Mechanical Stops are not preset at the factory, but must be set after mounting
on the associated equipment. If the actuator has been shipped already installed on a valve, the actuator
should have the Limit Switch and Mechanical Stops set for your application. If the actuator is not
already installed on a valve or needs resetting, use the following instructions to make the appropriate
settings.

The following instructions for setting the Limit Switches and Mechanical Stops are based on the typical
orientation for most actuator applications. Consult the applicable wiring diagram located in the Control
Compartment for the specific Limit Switch development.

NOTE: While making Limit Switch settings, remember that the Limit Cams rotate in the same direction
as the valve stem.

5.8 Setting the Limit Switches

c WARNING: Do not manually operate actuator with devices other than installed Handwheel and

Declutch Lever. Using additive force devices (cheater bars, wheel wrenches, pipe wrenches or
other devices of this nature) on the actuator Handwheel or Declutch Lever may cause serious
personal injury and/or damage to the actuator or valve.

c WARNING: HAZARDOUS VOLTAGE. Make sure all power is disconnected before making the

following settings.

5.8.1 Setting the CLOSED Limit Switch

1. Put the actuator in MANUAL operation: move the Declutch Lever in the direction of the arrow on the
lever until the Declutch Lever locks in place. If Declutch Lever is difficult to move, see Section 6.4,
Manual Operation for instructions to release the Declutch Lever.

2. Turn the Handwheel CW to move the valve to the full CLOSE position.

NOTE: Most applications require turning the Handwheel CW to obtain the full CLOSE position and

CCW to obtain full OPEN position. The Drive Sleeves and Limit Cams also rotate in CW rotation to
the CLOSE position and CCW to the OPEN position. If the application is configured differently, the
descriptions in this manual will describe rotation directions opposite your application.

3. Loosen Setting Nut (piece #7-10) located at the top of the switch bracket approximately ¾ turn.

NOTE: When setting the Limit Cams by rotating to the trip point as described in Step 4, be careful

not to move more than one cam at a time. Limit Cams that have already been set are not secure
until Setting Nut (piece #7-10) is retightened.

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11

CLOSE

Figure 5.7 – Limit Switch Setting Nut

100

50

0

OPEN

PERCENT

Limitorque

7-10

Standard OPEN
Microswitch location

Standard CLOSE
Microswitch location

4. Rotate the CLOSE Limit Cam CW through the high side to the trip point until the Switch Plunger is
released. This causes the N.O. (normally open) contact to open.

NOTE: There will be no electrical continuity at the trip point when measuring with an ohmmeter

between the common lead and the N.O. lead. You may also hear a faint “click” at the trip point.

NOTE: During actuator operation, when the Switch Plunger trips, the N.O. contact is released,

causing the Limit Switch to stop the actuator in the CLOSED position.

Figure 5.8 – Setting CLOSE Limit Cam

Tr ip Point
position
(“click”)

CLOSE
Limit Cam

Switch Plunger

COM

NO

NC

CLOSE microswitch
position when valve
has reached the CLOSED
position and microswitch
has tripped

CLOSE
Limit Cam

High Side

Rotate CW to
reach CLOSE
Tr ip Point

COM

NO

NC

CLOSE microswitch
position while valve
is traveling from OPEN
toward the CLOSED
position

Switch
Plunger

High Side

20

5. Retighten Setting Nut (piece #7-10).