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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

September 1998

OHIO SEMITRONICS, INC.

4242 Reynolds Drive

Hilliard, Ohio 43026

Phone: 614-777-1005

Fax: 614-777-4511

E-mail:

[email protected]

http://www.ohiosemitronics.com

PC5-MANUAL

OSI # A-7004-01, Rev.A, 11/28/04

Содержание PC5 Series

Страница 1: ...LER 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 Hil...

Страница 2: ...that these Hall effect watt transducers do an excellent job calculating power where severe distortion or chopped current and voltage wave shapes exist Watt transducers are available from Ohio Semitron...

Страница 3: ...ral 6 9 2 Adjustments 7 9 3 Final Calibration 8 10 Installation 12 11 Troubleshooting 12 Figure 6 Balance adjust potentiometers 14 Figure 7 Test Connections 15 10 2W Figure 8 Test Connections 15 10 3W...

Страница 4: ...nd one voltage transformer This mea sures total power in a two wire circuit B Polyphase Two Element This type has two current sensors and two voltage transformers This trans ducer will measure total p...

Страница 5: ...presents apparent power is eliminated using the simple filter circuit shown below 200 OHMS 100 ufd Input Output Figure 2 In all cases the base outputs are filtered and amplified to provide 0 to 1mA 0...

Страница 6: ...20 as long as the voltage and current are in their effective range 3 2 VOLTAGE INPUTS PC5 Watt Transducers are designed for nominal inputs of 120 240 277 or 480 VAC The effective range at the specifie...

Страница 7: ...C5 watt transducers are corrected for power factors from 0 lead to unity to 0 lag 0 to 90 and are within the specified accuracy listed 5 FREQUENCY RANGE The PC5 Watt Transducers are designed to operat...

Страница 8: ...tc 8 SCALING 8 1 OSI has a complete line of watt transducers for various applications These are designed for a particular voltage and current range and are calibrated as a package If a watt transducer...

Страница 9: ...All PC5 Watt Transducers are factory calibrated and checked 100 for voltage and current linearity power factor and initial set point Temperature is checked on random samples Instrumentation used for...

Страница 10: ...the full scale line current required is not available amp turns through the current transformer or transducer window may be used The windings must be distributed uniformly around the current transform...

Страница 11: ...just the power source for a full scale Standard Wattmeter reading Now adjust the internal balance trimpot for a zero output reading at terminals 1 and 2 3 Element 30 4W After the test connections are...

Страница 12: ...nd 9 2B on page 8 A Example 10 2W 1 Element Model PC5 010B Voltage 120 VAC Current 10 A AC Rated Output 1 mA 1 kW Load on Output Required 1 K 0 05 Resistor External Sensor Required None Test Connectio...

Страница 13: ...nal when 10 amperes are applied Energize the voltage and apply the neces sary current to obtain either 20 kW or the 2kW reading if 10 ampere turns are used in the Standard Wattmeter Adjust the CAL tri...

Страница 14: ...VAC Current 5 A AC Rated Output 1 mA 1500 Watts Load On Output Required 10 K 0 05 External Sensor Required None Test Connections Drawing Figure 9B Standard Wattmeter Set Up 120 V 5 A FS 500 W Accuracy...

Страница 15: ...UTION All 50 ampere Watt Transducers require two turns through the window of the current transformers PROBLEM 1 3 Output SOLUTION 30 4W units polarity of one phase reversed PROBLEM Doesn t Seem Calibr...

Страница 16: ...er words the motor is not doing any work Power in watts is the measure of the rate at which work is being done Electric motors often have a power factor rating This rating is for the fully loaded moto...

Страница 17: ...of the balance control on the boards of the PC5 series watt transducers From upper left clockwise around the page Figure 6a is used for 2 and 2 element models with output options A B C D CX5 and X5 F...

Страница 18: ...rect connections b Using a current transformer Figure 7 Test Connection for 1 phase 2 wire 1 Element Watt Transducer I 1 2 3 4 5 6 7 8 9 10 11 12 Instrument Power See Note 2 Output E 1 2 3 4 5 6 7 8 9...

Страница 19: ...ement PC5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Instrument Power See Note 2 Output E 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Instrument Power See Note 2 Output E H1 H1 H1 I c Using current transformers with a 3 e...

Страница 20: ...is the prefered method of calibration Rotek Instruments Corp 390 Main St Waltham MA 02254 781 899 4611 Figure 10a Figure 10b Notes 1 50 ampere models require two 2 primary turns through the current tr...

Страница 21: ...d as part of OSI watt transducers have white and black secondary leads The white lead is the X1 lead and the Black is the X2 lead In OSI connection diagrams the dots in the diagrams refer to the H1 fo...

Страница 22: ...models with B D X5 E Options Output Signal LOAD LINE L1 NEUTRAL 1 element connection for a single phase 2 wire load 1 2 3 4 5 6 7 8 9 10 11 12 LOAD X1 X1 X1 X1 H1 H1 H1 H1 120 volts AC for models with...

Страница 23: ...LOAD NEUTRAL L3 L2 3 element connections for a 3 phase 4 wire load LOAD 1 2 3 4 5 6 7 8 9 10 11 12 120 volts AC for models with B D X5 E Options Output Signal LINE X1 L1 L2 L3 X1 H1 H1 X1 H1 Output o...

Страница 24: ...1 LOAD X1 X1 H1 H1 Output Signal LINE H1 X1 L1 L2 L3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 120 volts AC for models with B D X5 E Options H1 X1 H1 X1 Neutral 2 1 2 element connections for a 3 phase 4 wire l...

Страница 25: ...PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL Page 22 This page is intentionally left blank Use this for your notes...

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