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OPERATION & CALIBRATION MANUAL
PC5 SERIES WATT TRANSDUCERS
This manual applies to both PC5 (50 and 60 Hertz) and PC4 (400 Hertz) Watt Transducers.
By David W. MILLER
Edited and revised by William D. Walden September, 1998
OHIO SEMITRONICS, INCORPORATED
Copyright by David W. Miller and Ohio Semitronics, Inc.
September 1998
OHIO SEMITRONICS, INC.
4242 Reynolds Drive
Hilliard, Ohio 43026
Phone: 614-777-1005
Fax: 614-777-4511
E-mail:
sales@ohiosemitronics.com
http://www.ohiosemitronics.com
PC5-MANUAL
OSI # A-7004-01, Rev.A, 11/28/04
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Related Manuals for OHIO SEMITRONICS PC5 Series
Summary of Contents for OHIO SEMITRONICS PC5 Series
- Page 1 This manual applies to both PC5 (50 and 60 Hertz) and PC4 (400 Hertz) Watt Transducers. By David W. MILLER Edited and revised by William D. Walden September, 1998 OHIO SEMITRONICS, INCORPORATED Copyright by David W. Miller and Ohio Semitronics, Inc. September 1998 OHIO SEMITRONICS, INC. 4242 Reynolds Drive...
- Page 2 Semitronics, Inc. using standards that are traceable to the National Institute of Standards and Technology (NIST). The PC5 series watt transducers are unique in that these Hall effect watt transducers do an excellent job calculating power where severe distortion or chopped current and voltage wave shapes exist.
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Page 3: Table Of Contents
PT & CT Connection Diagrams Drawing A902-076 Rev. A 12/98 1 and 2 element connections 3 and 1 ½ element connections 2 ½ element connections PC5 Specification Sheets Last section of this manual. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page ii... -
Page 4: Operating Principles
Polyphase (Two Element) proportional to the true power and the sine This type has two current sensors and wave shown as solid lines is proportional to two voltage transformers. This trans- PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 1... - Page 5 1.57 3.14 4.71 6.28 when ordering the transducer. Base models 6.28 Figure 1c (models with non-amplified outputs) are no longer available from Ohio Semitronics, Inc. except by special request. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 2...
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Page 6: Voltage Inputs
See Page 18 Technical 20mA is obtained. All transducer outputs will Bulletin 101 for wire sizes. over range by 20% as long as the voltage and current are in their effective range. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 3... -
Page 7: Power Factor
Or, may be scaled for a digital meter using a load resistor. PC5-001B 0276 9 10 11 12 1/2 horsepower single phase motor load Watts 115 volts LRB 500 load resistor 115 volts AC Figure 4 PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 4... -
Page 8: Readout Instruments
The value of the load resistor may be READOUT INSTRUMENT calculated using Ohm’s Law: Analog instruments, which accept a 0 to 1mADC input, may be directly connected to R = E/I Where E is the desired the output terminals of the watt transducer voltage and I is 0.001 (1 mADC). -
Page 9: Ampere Turns
2 elements and All PC5 Watt Transducers are factory 1/3 of the total specified output on 3 calibrated and checked 100% for voltage elements PC5 Watt Transducers. and current linearity, power factor, and initial PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 6... -
Page 10: Adjustments
2, 2½, and 3 elements are not available; amp-turns through the located inside the can. Refer to Figure 6 for current transformer or transducer location. window may be used. The windings PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 7... - Page 11 Energize the voltage and current and adjust the power source for a full scale Standard The best method of calibration is to use a Precision Wattmeter Calibrator, if this PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 8...
- Page 12 With the voltage maintained at 120 VAC, both lead and lag. Current, voltage, and change the current such that the power linearity should be within 0.5% FS. reading goes from 0 to 1000 watts on the PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 9...
- Page 13 Accuracy 0.5% FS Refer to Figure 10A or 10B on page 17 connections between the calibration and the Calibration Test Set-Up, make the required direct connections in Figure 9A on page 16. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 10...
- Page 14 1 & 2. output should be within 0.005 V or 0.5% With the voltage maintained at 120 VAC, change the current from 0 to 500 watts. The PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 11...
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Page 15: Installation
Transducers require two turns means is that very little power through the window of the (compared to the rated motor current transformers. power) is required to keep the motor running at constant PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 12... - Page 16 Electric motors often have a power factor rating. This rating is for the fully loaded motor only and will not apply to an unloaded or partially loaded motor. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 13...
- Page 17 Figure 6a 2 and 2 ½ element models except those with option E. Figure 6b 2 and 2 1/2 element models with Figure 6c All 3 element models. option E, the 4 to 20 ADC output. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 14...
- Page 18 See Note 2 ± ± ± ± (b) Using current transformers (a) Direct connections Figure 8 Test connections for 1 phase, 3 wire & 3 phase, 3 wire, 2 Element Watt Transducers PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 15...
- Page 19 (c) Using current transformers with a 3 element PC5 Figure 9 3 Phase, 4 Wire 2 ½ element Watt Transducer Connections. 3 Phase, 4 wire 3 Element Watt Transducer Connections. 3 Phase, 4 wire 3 Element Watt Transducer Connections. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 16...
- Page 20 PC5 models with the suffix B, D, E, or X5 require 120 volts AC instrument power. The following indicates a connection between the PC5 watt transducer and the calibrator. Transducer Calibrator PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 17...
- Page 21 12 GAUGE WIRE 14 GAUGE WIRE 100:5 20 feet 15 feet 10 feet 200:5 through 400:5 40 feet 30 feet 20 feet 600:5 and higher 80 feet 60 feet 40 feet TB101.12.98 PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 18...
- Page 22 Output Signal D, X5,& E Options LINE LOAD 2-element connection for a 3-phase, 3-wire connection. Load may be unbalanced, voltage may be unbalanced. Drawing A902-76 Rev. A December 1998 Page 1 of 3. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 19...
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Page 23: ½ Element Connections
120 volts AC for models with B, Output Signal D, X5,& E Options LOAD LINE 1 ½-element connections for a balanced 3-phase, 3-wire load. Drawing A902-76 Rev. B June 1999 Page 2 of 3. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 20... - Page 24 B, Output Signal D, X5,& E Options LOAD LINE Neutral 2 1/2 element connections for a 3-phase, 4-wire load. Drawing A902-76 Rev. A December 1998 Page 3 of 3. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 21...
- Page 25 This page is intentionally left blank. Use this for your notes. PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 22...