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Emerson Fisher L2e, Instruction Manual

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Emerson Fisher L2e Instruction Manual Download Page 11

Instruction Manual

D103531X012

L2e Controller

June 2022

11

L2e Initial Setup (Dry Displacer)

Refer to figure 7.

1.  Apply power to the L2e Switch assembly.

2.  Move Span to minimum setting.

3.  If the switch is already in the state that opens the dump valve, skip to step 4. Otherwise, (e.g., lever B is resting on

its travel stop), first move the plunger 

away

 from the switch by moving the Zero adjustment until the switch just

changes to the state required to open the dump valve.

4.  Slowly bring the plunger

 towards

 the switch by moving the Zero adjustment until the switch changes to the state

required to 

close

 the dump valve.

L2e Zero and Span Adjustment (Wet Displacer)

After initial setup (dry displacer) is complete,

1.  Enable process flow into the vessel.

2.  Move Zero and Span Adjustment for desired liquid zero position and level DG.

3.  Tighten the Zero Adjustment hex nut (key 5), shown in figure 10, to lock the Zero setting.

Figure 7. Initial Setup

ÂÂ

SPAN ADJUSTMENT

ZERO
ADJUSTMENT

SPAN 
ADJUSTMENT

ZERO 
ADJUSTMENT

CAUTION: FACTORY SET
— DO NOT ADJUST —

MOVE

MOVE

LEVEL HEIGHT

LEVEL

DIFFERENTIAL GAP

INCREASE

DECREASE

RAISE

LOWER

Summary of Contents for Fisher L2e

Page 1: ...ed Documents 16 Parts Ordering 16 Figure 1 Fisher L2e Electric Level Controller X0660 Introduction Scope of Manual This instruction manual includes installation adjustment maintenance and parts ordering information for the Fisher L2e electric liquid level controller Do not install operate or maintain an L2e electric liquid level controller without being fully trained and qualified in valve actuato...

Page 2: ...e upper trip point and the zero or lower trip point is called differential gap or DG The L2e operates as a two position on off controller The instrument uses an electronic switch solid state relay that provides one Normally Closed NC and one Normally Open NO contact The electronic switch can be used to provide liquid monitoring or to provide differential gap DG control by operating an electrically...

Page 3: ...1 2 14 NPT external conduit connection with 0 5 m greater than 18 inches of 18 AWG lead wires located at the bottom of the case Displacer Sizes J 48 X 305 mm 541 cm3 1 7 8 X 12 inches 33 in3 J 76 X 152 mm 688 cm3 3 X 6 inches 42 in3 Maximum Displacer Insertion Length 2 Horizontal or Vertical 1 7 8 x 12 Displacer with one 6 inch extension optional use 3 x 6 Displacer with one 3 inch extension optio...

Page 4: ...2 available at Fisher com or from your Emerson sales office 2 Maximum span setting with 1 7 8 x 12 inch horizontal displacer plus 6 inch extension is not recommended due to potentially insufficient zero adjustment 3 The pressure and temperature limits in this document and any applicable code limitations should not be exceeded 4 Electronic switch pressure rating is based on maximum pressure at sens...

Page 5: ... portion of the universal joint assembly 3 Tighten the jam nut against the displacer Attaching a Horizontal Displacer Refer to figure 12 for part locations 1 Thread the displacer key 81 all the way onto the displacer rod key 64 or extension key 82 and tighten Attaching the Sensor to the Vessel Insert the displacer end of the L2e sensor into the vessel connection and tighten enough to seal the thre...

Page 6: ...NPT conduit connection with 0 5 meters greater than 18 inches of 18 AWG lead wires is located at the bottom of the case The conduit connection is integral to the body of the switch The Electronic Switch has Normally Closed NC and Normally Open NO outputs The Switch electronics is housed in Explosion Flame proof and dust explosion proof enclosure The action of the controller is such that the switch...

Page 7: ... the L2e switch terminals in parallel with the easy Drive input terminals as they will be unintentionally and constantly activated by the easy Drive sourcing type input circuits If a PLC with sinking digital input cards is used the easy Drive input terminals need to be driven by a digital output card on that PLC and the PLC must control those digital outputs by its logic program after reading its ...

Page 8: ... CONTROL TERMINAL ROC809 DI MODULE X0661 CLOSE OPEN 1 CONNECT GREEN WIRE TO ACTUATOR GROUND NOT SHOWN 2 OPEN CONTACT 2 MAY BE LABELED N O AND CLOSE CONTACT 3 MAY BE LABLED N C 1 2 GREEN GND REMOVE COVER TO ACCESS POWER AND CONTROL TERMINAL W9795 4 easy Drive ACTUATOR WITH FISHER D3 CONTROL VALVE Figure 4 Local Level Loop Control with Direct Connect to easy Drive Actuator with ROC809 Remote Monitor...

Page 9: ...SURE EXTERNALLY POWERED 12 24 VDC POWER SUPPLY FloBoss 107 AI DI MODULE OR FloBoss 107 DIs ON CPU MODULE S OPTIONAL I O ASSEMBLY X0661 CLOSE OPEN 1 CONNECT GREEN WIRE TO ACTUATOR GROUND NOT SHOWN 2 OPEN CONTACT 2 MAY BE LABELED N O AND CLOSE CONTACT 3 MAY BE LABLED N C 1 GREEN GND 2 REMOVE COVER TO ACCESS POWER AND CONTROL TERMINAL easy Drive ACTUATOR POWER AND CONTROL TERMINAL easy Drive ACTUATOR...

Page 10: ... with an accompanying decrease in enclosure pressure from the operating process pressure Thus annunciation of a process seal failure is provided The switch component which is separately sealed from the L2e main enclosure volume by a metal cap is never exposed to full process pressure even in the event of process seal failure Figure 6 Schematic PROCESS PRESSURE VESSEL INSTRUMENT ENCLOSURE VENT PROC...

Page 11: ...e dump valve 4 Slowly bring the plunger towards the switch by moving the Zero adjustment until the switch changes to the state required to close the dump valve L2e Zero and Span Adjustment Wet Displacer After initial setup dry displacer is complete 1 Enable process flow into the vessel 2 Move Zero and Span Adjustment for desired liquid zero position and level DG 3 Tighten the Zero Adjustment hex n...

Page 12: ... figure 8 and 9 As fluid level rises the magnet moves away from the switch and vice versa The lower switch point at which the dump valve is to close is set by balancing out the net force at that position with the zero spring setting Figure 8 Principle of Operation Schematic LEVER ARM DISPLACER PIVOT ZERO SPRING LEVER B LEVER A LEVER B RETURN SPRING LEVER A PIVOT AND LEVER B TRAVEL STOP SPAN ADJUST...

Page 13: ...PER TRIP POINT CLOSES AT LOWER TRIP POINT DUMP DUMP VALVE EasyDrive ELECTRONIC SWITCH Figure 9 Fisher L2e Controller Operation Figure 10 Fisher L2e Controller SWITCH SPAN ADJUSTMENT LEVER B GG10047 w Displacer Rod PLUNGER FACTORY SET DO NOT ADJUST LEVER A CONTROLLER MOUNTING SCREWS KEY 24 ZERO SPRING KEY 7 ZERO ADJUSTMENT DISPLACER ROD KEY 64 ZERO ADJUSTMENT HEX NUT KEY 5 ...

Page 14: ...Controller From the Sensor Refer to figure 9 for key number locations unless otherwise indicated 1 Disconnect power from any electrical source 2 Slide the hook end of the zero spring key 7 over and off the controller end of the displacer rod key 64 3 Remove the four controller mounting screws key 24 and pull the controller straight away from the sensor Installing Sensor Repair Kit RL2SENSX012 Refe...

Page 15: ...placer rod key 64 into the vessel side of the sensor connection key 65 5 The pivot base must seat in the slots cast in the sensor connection These slots will be horizontal when the sensor connection key 65 is oriented as shown in figure 2 6 To reduce the possibility of nicking the O ring key 77 on the pivot base keep the displacer rod centered in the sensor connection as much as possible while pus...

Page 16: ...e Assembly D103039X012 D Fisher D4 Control Valve with easy Drive Electric Actuator Instruction Manual D103597X012 All documents are available from your Emerson sales office or Fisher com Parts Ordering When corresponding with your Emerson sales office about this equipment always mention the serial number of the controller The serial number can be found on the nameplate WARNING Use only genuine Fis...

Page 17: ...r rod 65 Sensor connection 66 Spacer 67 Hex jam nut 68 Conical spring 69 Universal Joint vertical displacer only 70 Nameplate Key Description 71 Drive screw 72 Knife pivot body 73 Knife pivot base Note Keys 74 75 76 77 and 78 are included in the Sensor Repair Kit 74 O Ring 75 Anti extrusion ring 76 Retaining ring 77 O Ring 78 Backup ring 79 Sealant silicone not furnished with sensor 81 Displacer 1...

Page 18: ...Instruction Manual D103531X012 L2e Controller June 2022 18 Figure 12 Sensor SECTION A A A A C C B VIEW B B SCALE 2 1 SECTION C C SCALE 2 1 j APPLY LUB SEALANT GG12263 B ...

Page 19: ...Instruction Manual D103531X012 L2e Controller June 2022 19 ...

Page 20: ...available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice E 2013 2022 Fisher Controls International LLC All rights reserved Fisher and easy Drive are marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co Emerson Automation Solutions Emerson and the Emerson logo ar...

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