Instruction Manual

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Fisherr 546NS Electro‐Pneumatic Transducer

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 2.................................

Specifications 3...............................

564NS Qualification 3......................

Educational Services 3.........................

Installation 5..................................

Hazardous Area Classifications 5.................

Mounting 6..................................

Pressure Connections 6........................

Diagnostic Connections 7......................

Electrical Connections 8........................

Operating Information 9.........................

Adjustments 9................................

Calibration 10................................

Equipment Required 10.....................

Calibration Procedure 10....................

Recalibration 11...........................

Changing Output Pressure Range 12.............

Reversing the Action 12........................

Split Range Operation 12.......................

Principle of Operation 13........................

Maintenance 14................................

Relay Removal and Replacement 15..............

Replacing the Feedback Bellows Assembly 15......

Troubleshooting 16............................

Electrical 16..............................

Pneumatic 16.............................

Alignment 17.................................

Span Adjustment 17.......................

Torque Motor Frame 18....................

Armature Travel Stop 18....................

Coil 18...................................

Figure 1. Fisher 546NS Electro‐Pneumatic Transducer

Mounted on a 657 Pneumatic Diaphragm Actuator

W2115

546NS

FILTER

REGULATOR

Parts Ordering 19...............................

Repair Kits 19..................................

Parts List 19...................................

Transducer 19................................

Torque Motor 20..............................

Relay 22.....................................

Mounting Parts 23.............................

Diagnostic Connections 23.....................

Introduction

Scope of Manual

This instruction manual provides installation, operation, maintenance, and parts ordering information for the Fisher

546NS transducer and the 82 relay. Refer to separate manuals for instructions covering equipment used with the

transducer.

Instruction Manual

D103425X012

546NS Transducer

April 2015

Summary of content (24 pages)

PAGE 1
Instruction Manual 546NS Transducer D103425X012 April 2015 Fisherr 546NS Electro‐Pneumatic Transducer Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 564NS Qualification . . . . . . . . . . . . . . . . . . . . . .
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546NS Transducer April 2015 Instruction Manual D103425X012 Do not install, operate or maintain a 546NS transducer without being fully trained and qualified in valve, actuator and accessory installation, operation and maintenance. To avoid personal injury or property damage it is important to carefully read, understand, and follow all of the contents of this manual, including all safety cautions and warnings.
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Instruction Manual 546NS Transducer D103425X012 April 2015 Specifications Specifications are listed in table 1. 546NS Qualification The 546NS is qualified to meet stringent environmental conditions encountered in nuclear power plant containment areas. Samples were subjected to the tests summarized below: D Thermal Aging: accelerated service temperature of 54_C (130_F) over 10 years.
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Instruction Manual 546NS Transducer D103425X012 April 2015 Table 1. Specifications Performance(3) Available Configuration Actuator Loading Time: See figure 6 Electro‐pneumatic signal transducer with explosion‐proof case and cover, with EPDM elastomers for use in elevated temperature and radiation environments Reference Accuracy(4): ±0.75% of the output span Independent Linearity: ±0.50% of the output span Open Loop Gain: 26 The 546NS can be ordered with or without a Fisher 67 filter regulator.
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Instruction Manual 546NS Transducer D103425X012 April 2015 Table 1. Specifications (continued) Approximate Weight 4.1 kg (9 pounds) Declaration of SEP Fisher Controls International LLC declares this product to be in compliance with Article 3 paragraph 3 of the Pressure Equipment Directive (PED) 97 / 23 / EC. It was designed and manufactured in accordance with Sound Engineering Practice (SEP) and cannot bear the CE marking related to PED compliance.
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Instruction Manual 546NS Transducer D103425X012 April 2015 Note This information supplements the nameplate markings affixed to the product. Always refer to the nameplate itself to identify the appropriate certification. Contact your Emerson Process Management sales office for approval/certification information not listed here. CSA and FM No special conditions of safe use. Refer to table 3 and 4 for approval information. Table 3.
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Instruction Manual 546NS Transducer D103425X012 April 2015 Note The supply source must be clean, dry, oil‐free, non‐corrosive air at an unfailing pressure at least 0.3 bar (5 psig) higher than the upper limit of the transducer output pressure range. This means that for an output pressure range of 0.2 to 1.0 bar (3 to 15 psig) the supply pressure should be at least 1.4 bar (20 psig); for a 0.4 to 2.0 bar (6 to 30 psig) range, the supply pressure should be at least 2.4 bar (35 psig).
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Instruction Manual 546NS Transducer D103425X012 April 2015 Electrical Connections WARNING For explosion‐proof applications, disconnect power before removing the transducer cover. Personal injury or property damage may result from fire or explosion if power is applied to the transducer with the cover removed in a hazardous area. Also refer to the Warning at the beginning of the Operating Information section.
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Instruction Manual 546NS Transducer D103425X012 April 2015 Operating Information WARNING Personal injury or property damage may result from fire or explosion if power is applied to the transducer with the cover removed in a hazardous area.
PAGE 10
546NS Transducer Instruction Manual April 2015 D103425X012 Calibration Equipment Required Choose a current source that is capable, without switching ranges, of driving the transducer through its entire input range. Switching ranges on a current source will produce spikes or mid‐scale reverses in the input signal presented to the transducer, causing errors. Calibration Procedure Note The following calibration procedure is for a 546NS transducer with a 4 to 20 mA DC input signal range and a 0.2 to 1.
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Instruction Manual 546NS Transducer D103425X012 April 2015 CAUTION Reversing the DC input during the calibration cycle may result in product damage. Note During the calibration cycle, use care to avoid overshoot. In other words, if data is to be recorded at an 8.00 mA DC input while moving upscale and you accidently pass 8.00 to some higher value, run the test again starting at step 7 with the three exercise cycles. Do not reverse direction and move down scale to 8.00 mA DC. 10.
PAGE 12
Instruction Manual 546NS Transducer D103425X012 April 2015 Changing Output Pressure Range Changing the output pressure range from 0.2 to 1.0 bar (3 to 15 psig) to 0.4 to 2.0 bar (6 to 30 psig) or vice versa requires changing the feedback bellows (key 57, figure 8). To do this, refer to the replacing the feedback bellows assembly procedures in the Maintenance section. Note Re‐magnetization of the torque motor is required when changing the output pressure range.
PAGE 13
Instruction Manual 546NS Transducer D103425X012 April 2015 Principle of Operation Refer to the schematic drawing in figure 5. Assume that the transducer is direct‐acting. An increase in the DC signal to the coils increases the magnetic field around the coils. This field increases the magnetic strength in the armature and the magnetic attraction across the air gap between the armature and the pole pieces. The pole pieces are already polarized by the permanent magnet.
PAGE 14
Instruction Manual 546NS Transducer D103425X012 April 2015 The output decreases until the diaphragm assembly is forced back to its original position and the exhaust port is closed again. The reduced pressure in the feedback bellows diminishes the force to return the armature to the equilibrium position. Figure 6 shows output‐time relationship curves for loading and exhausting an actuator. Exhausting times are nominally 25 percent of the loading times. Figure 6.
PAGE 15
Instruction Manual 546NS Transducer D103425X012 April 2015 WARNING For explosion proof applications, disconnect power before opening the transducer cover. Personal injury or property damage may result from fire or explosion if power is not disconnected.
PAGE 16
546NS Transducer Instruction Manual April 2015 D103425X012 1. Loosen the hex nut (key 31). 2. Remove the bellows screw (key 56) and O‐ring (key 36) under the head of the bellows screw. 3. Pull the bellows assembly (key 57) out. The armature is slotted to allow removal of the bellows assembly. 4. Inspect and, if necessary, replace the two O‐rings (key 36). Make sure the O‐rings under the bellows assembly are in place. 5. Choose the correct bellows assembly as outlined in table 6.
PAGE 17
Instruction Manual 546NS Transducer D103425X012 April 2015 5. If the transducer cycles, be sure there are no sharp bends in the copper capillary feedback tubing (key 56, figure 8) and that the tubing is not plugged. 6. Check the nozzle. If it is clogged, remove the entire torque motor assembly from the case by removing four machine screws (key 9, figure 7). Run a wire through the nozzle from the underside of the assembly. 7.
PAGE 18
546NS Transducer April 2015 Instruction Manual D103425X012 Torque Motor Frame The top pole piece plate (key 50, figure 8) of the torque motor can become twisted with respect to the bottom pole piece plate (key 51, figure 8). If this happens contact your Emerson Process Management sales office. Armature Travel Stop The armature travel stop (key 52, figure 8) must be in place to prevent overstressing the armature and coil support (key 41, figure 8) due to over‐travel.
PAGE 19
Instruction Manual 546NS Transducer D103425X012 April 2015 Parts Ordering Whenever corresponding with your sales office about this equipment, mention the serial number of the unit. This serial number can be found on the nameplate. When ordering replacement parts, also state the complete 11‐character part number of each part needed as found in the following parts list. Note In the torque motor assembly drawing (figure 8), there are many shaded key numbers.
PAGE 20
Instruction Manual 546NS Transducer D103425X012 April 2015 Figure 7.
PAGE 21
Instruction Manual 546NS Transducer D103425X012 April 2015 Figure 8. Torque Motor Assembly APPLY LUBRICANT/SEALANT NOTES: 1. SHADED KEY NUMBERS INDICATE PARTS THAT SHOULD NOT BE DISASSEMBLED FROM TORQUE MOTOR. 2. KEY NUMBERS 22 AND 103 ARE NOT SHOWN. 30A8594‐K B1767‐3 Key Description 51(1) 52(1) 53(1) 55(1) 56 Bottom Pole Piece Plate Travel Stop Terminal Mounting Bracket Ass'y Span Adjustment Ass'y(2) Bellows Screw, brass 57* Bellows Ass'y, brass Full Size, 21 mm (27/32 inch) O.D.
PAGE 22
546NS Transducer Figure 9. Fisher 82 Relay Assembly RESTRICTION HOLES APPLY LUBRICANT/SEALANT NOTE: KEY 76 IS NOT SHOWN A1504‐1 Relay (figure 9) Note The 546NS relay is not repairable. If the relay is defective, order the 82 Relay Replacement Assembly (refer to Parts Kits).
PAGE 23
Instruction Manual 546NS Transducer D103425X012 Mounting Parts Note Contact your Emerson Process Management sales office for part numbers.
PAGE 24
546NS Transducer April 2015 Instruction Manual D103425X012 Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher is a mark owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co.