Instruction Manual Form 1783 December 1997
Type 546, 546S, and 546NS
Type 546, 546S, and 546NS Electro-Pneumatic Transducers Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Repair Kits for Type 546, 546S, and 546NS Transducers . . . . . . . . . . . . . . . . . . Type 546, 546S, & 546NS Transducers . . . . . . . Torque Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Type 82 Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Connections . . . . . . . . . . . . . . . . . . . . . Mounting Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
Loop Schematics
Operating Information
Introduction
................................ 2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pressure Connections . . . . . . . . . . . . . . . . . . . . . . . . 4 Diagnostic Connections . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . 4 ................... 5 Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . 6 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . 6 Recalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Changing Output Pressure Range . . . . . . . . . . . . . . 7 Reversing the Action . . . . . . . . . . . . . . . . . . . . . . . . . 7 Split Range Operation . . . . . . . . . . . . . . . . . . . . . . . . 7
Principle of Operation
................... 8
Maintenance
.............................. 9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Pneumatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Span Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 10 Torque Motor Frame . . . . . . . . . . . . . . . . . . . . . . 11 Armature Travel Stop . . . . . . . . . . . . . . . . . . . . . 11 Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Type 82 Relay Removal and Replacement . . . . 11 Type 82 Relay Maintenance . . . . . . . . . . . . . . . . . 11 Replacing the Feedback Bellows Assembly . . . . 12
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12 13 13 14 15 15
. . . . . . . . . . . . . . . . . . . . . . . 17 CSA Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 FM Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Scope of Manual This instruction manual provides installation, operation, maintenance, and parts ordering information for the Type 546, 546S, and 546NS transducers and Type 82 relay. Refer to separate manuals for instructions covering equipment used with the transducer. Only personnel qualified through training or experience should install, operate, and maintain this transducer. If there are any questions concerning these instructions, contact your Fisher Controls sales office or sales representative before proceeding.
Description The Type 546 or 546NS transducer (figure 1) receives either a voltage (Vdc) or a current (mAdc) input signal and transmits a proportional pneumatic output pressure to a final control element. The Type 546S transducer receives a current (mAdc) input signal and transmits a proportional pneumatic output pressure. A typical application is in electronic control loops where the final control element, generally a control valve, is pneumatically operated. The input signal, output pressure range, and electrical classification, if approved, of each transducer is indicated on the nameplate attached to the cover (figure 2). D200108X012
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