Schneider Electric PowerLogic PM5300 Series Especificaciones Pagina 62
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Power Meter 750 63230-507-201A1
Glossary 03/2007
© 2007 Schneider Electric All Rights Reserved58
minimum value—lowest value recorded of the instantaneous quantity
such as Phase A Current, Phase A Voltage, etc., since the last reset of the
minimums and maximums.
nominal—typical or average.
parity—refers to binary numbers sent over the communications link. An
extra bit is added so that the number of ones in the binary number is either
even or odd, depending on your configuration). Used to detect errors in
the transmission of data.
partial interval demand—calculation of energy thus far in a present
interval. Equal to energy accumulated thus far in the interval divided by the
length of the complete interval.
phase currents (rms)—measurement in amperes of the rms current for
each of the three phases of the circuit. See also maximum value.
phase rotation—refers to the order in which the instantaneous values of
the voltages or currents of the system reach their maximum positive
values. Two phase rotations are possible: A-B-C or A-C-B.
potential transformer (PT)—also known as a voltage transformer.
power factor (PF)—true power factor is the ratio of real power to apparent
power using the complete harmonic content of real and apparent power.
Calculated by dividing watts by volt amperes. Power factor is the
difference between the total power your utility delivers and the portion of
total power that does useful work. Power factor is the degree to which
voltage and current to a load are out of phase.
real power—calculation of the real power (3-phase total and per-phase
real power calculated) to obtain kilowatts.
rms—root mean square. Power meters are true rms sensing devices.
rolling block—a selected interval and subinterval that the power meter
uses for demand calculation. The subinterval must divide evenly into the
interval. Demand is updated at each subinterval, and the power meter
displays the demand value for the last completed interval.
scale factor—multipliers that the power meter uses to make values fit into
the register where information is stored.
safety extra low voltage (SELV) circuit—a SELV circuit is expected to
always be below a hazardous voltage level.
short integer—a signed 16-bit integer.
sliding block—an interval selected from 1 to 60 minutes (in 1-minute
increments). If the interval is between 1 and 15 minutes, the demand
calculation updates every 15 seconds. If the interval is between 16 and 60
minutes, the demand calculation updates every 60 seconds. The power
meter displays the demand value for the last completed interval.
system type—a unique code assigned to each type of system wiring
configuration of the power meter.
thermal demand—demand calculation based on thermal response.
Total Harmonic Distortion (THD or thd)—indicates the degree to which
the voltage or current signal is distorted in a circuit.
total power factor—see power factor.
true power factor—see power factor.
unsigned integer—an unsigned 16-bit integer.
unsigned long integer—an unsigned 32-bit value returned by a register.
The upper 16-bits are in the lowest-numbered register pair. For example,
in the register pair 4010 and 4011, 4010 contains the upper 16-bits while
4011 contains the lower 16-bits.
- Power Meter 750 1
- PLEASE NOTE 2
- FCC NOTICE 2
- 03/2007 Table of Contents 3
- Table of Contents 03/2007 4
- SECTION 1— INTRODUCTION 5
- Description Model Number 6
- SECTION 2— SAFETY PRECAUTIONS 7
- SECTION 3— OPERATION 9
- Section 3—Operation 03/2007 10
- Set Up the System Frequency 11
- Set Up the Meter System Type 11
- Set Up CTs 12
- Set Up PTs 12
- & 13
- Set Up Communications 14
- Set Up the Bar Graph Scale 14
- RDKDBSLN$D 15
- )%%% )%# 15
- 16
- 03/2007 Section 3—Operation 17
- SECTION 4— METERING 19
- 03/2007 Section 4—Metering 21
- PLSD110131 22
- Section 4—Metering 03/2007 24
- \\\\\\\\\ 25
- Normal Demand Mode 26
- +. Depending on 29
- SECTION 6— ALARMS 31
- Digital 32
- ###: until ALARM 32
- APPENDIX A—SPECIFICATIONS 35
- APPENDIX B—REGISTER LIST 37
- Setup & Status 38
- Metered Data 39
- Demand Values 42
- Min Max values 43
- I/O Setup & Status 48
- Alarm Setup & Status 49
- Alarm Configuration Template 50
- SUPPORTED MODBUS COMMANDS 52
- HOW SIGNED POWER FACTOR IS 52
- STORED IN THE REGISTER 52
- TROUBLESHOOTING GUIDE 55
- 3-WIRE AND 4-WIRE SYSTEMS 56
- SECTION III: 3-WIRE SYSTEM 56
- TROUBLESHOOTING 56
- SECTION IV: 4-WIRE SYSTEM 58
- Table C– 13:Section IV—Case E 59
- Table C– 14:Section IV—Case F 59
- Table C– 15:Section IV—Case G 59
- GLOSSARY 61
- Glossary 03/2007 62
- ABBREVIATIONS A—Ampere 63
- Index 03/2007 66
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