Flowserve Limitorque L120-85 - Page 51

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Limitorque L120-85 Installation, Operation and Maintenance FCD LMENIM1202-03-A4 – 06/15

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Table of Contents2
Introduction4
Purpose4
User Safety4
Initial Inspection and Storage Instructions5
Inspection and Recording5
Short-Term Storage5
Product Identification6
Product Description7
Product Features7
Figure 1: Limitorque L120-85 Actuator7
Actuator Weight8
Table 1: L120-85 Approximate Weight Chart8
Installation Instructions9
Actuator Mounting9
Figure 2: L120-85 Torque Drive Nut and Retaining Ring Details10
Figure 3: Thrust Base Removal from an L120-8510
Table 2: Torque Drive Nut: Maximum Allowable10
Torque Only Applications (Drive 1)11
Mounting Bolts11
Stem Cover for Rising Stem Applications11
Table 3: L120-85 Actuator/Mounting Base Tap Size11
Verifying Motor Rotation Direction12
Initial Electrical Connections12
Figure 4: L120-85 Torque Drive Nut Orientation (Drive 1)12
Figure 5: L120-85 Thrust Base Assembly Orientation (Drive 2)12
Figure 6: Electrical Compartment and Conduit Pipe Plug Openings13
Figure 7: Grounding Lug Location13
Motor Rotation (Phasing) and OPEN/CLOSE Pushbutton Operation14
Three-Phase Motor14
DC Motor14
Limit Switch Settings15
Basic Theory of Operation15
Figure 8: Limit Switch Rotor Development15
Adjustment-General16
Setting the OPEN Limit Switch17
Figure 9: L120-85 Limit Switch Components17
Setting the CLOSE Limit Switch18
Figure 10: Limit Switch OPEN/CLOSED Rotor Cam Orientation18
Torque Switch Setting and Wiring19
Basic Theory of Operation20
Setting the Torque Switch20
Balancing the Torque Switch20
Figure 11: Torque Switch Components20
Rewiring the Torque Switch for Non-Standard Drive Sleeve Rotation21
Figure 12: Reversing Torque Switch Wiring21
Position Indication22
Local Position Indication22
Remote Position Indication22
Figure 13: Aligning MDPI Pointer for Fully CLOSED Position22
Figure 14: Remote Position Indicator Calibration Configuration23
Setting the Potentiometer24
Figure 15: Potentiometer Calibration Configuration24
Figure 16: Loosening Potentiometer Assembly25
Operation26
Description of Motor Operation26
Description of Manual Operation26
Electrical Start-Up Procedure27
Maintenance28
Lubrication28
Initial Inspection28
Frequency28
Routine Inspection28
Factory Lubricants29
Minimum Lubricant Qualities Required29
Disassembly30
Removal from Valve30
Open Electrical Compartment and Disconnect Motor31
Remove Control Wiring31
Remove Limit and Torque Switch31
Remove Motor Assembly31
Remove Handwheel31
Remove Handwheel Shaft Assembly31
Remove Declutch Lever Assembly32
Remove Clutch Assembly32
Remove Clutch Pinion Assembly32
Remove Worm Shaft Assembly32
Figure 17: Removing Clutch Pinion Assembly32
Remove and Disassemble Thrust Base33
Remove Drive Sleeve33
Assembly34
Handwheel Shaft Assembly and Shimming34
Figure 18: Key Components Affected by Handwheel Shimming34
Figure 19: Cut-Away View of L120-85 Actuator35
Figure 20: Gap between Housing Face and Handwheel Bushing35
Table 4: Gap "A" Shim Thickness Selection Chart36
Figure 21: Shimming Parts and Their Order of Assembly37
Figure 22: Shim Location for Gap "B" Dimension37
Table 5: Gap "B" Shim Thickness Selection Chart37
Verifying Handwheel Operation38
Thrust Base Assembly and Shimming38
Troubleshooting39
Typical Wiring Diagram41
Three-Phase with Control Package41
Figure 23 Three-Phase with Control Package41
How to Order Parts42
L120-85 Illustrated Parts Breakdown43
Figure 24: Electrical Compartment43
Figure 25: Motor and Motor Drive Components44
Figure 26: Handwheel Shaft and Associated Components45
Figure 27: Drive Sleeve Group46
Figure 28: Thrust Base Group47
L120-85 Parts List48

Flowserve Limitorque L120-85 - Page 51

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