Manual

4 EM920 Power Quality and Revenue Meter
Table of Contents
Chapter 1 Introduction ............................................................... 8
Chapter 2 Operating the EM920................................................ 14
Meter Assembly ....................................................................................... 14
Controls and Indicators ........................................................................... 15
TEST Mode ............................................................................................... 16
Device Diagnostics................................................................................... 17
Meter Security.......................................................................................... 17
Meter Clock and Time Synchronization.................................................... 18
Monitoring the Meter Battery................................................................... 19
Billing and Energy Metering..................................................................... 19
Instrumentation Metering ....................................................................... 21
Demand Forgiveness (Cold Load Pickup) ................................................ 22
Instrument Transformer Correction ........................................................ 22
Power Transformer/Line Loss Compensation.......................................... 23
Operating Digital Inputs .......................................................................... 24
Operating Relay Outputs.......................................................................... 24
Operating Analog Outputs ....................................................................... 25
Operating the Logical Controller.............................................................. 25
Operating the Event Recorder.................................................................. 25
Operating the EN50160 Power Quality Recorder..................................... 25
Operating the Fast Transient Recorder.................................................... 26
Operating the Fault Recorder................................................................... 26
Communicating with the EM920.............................................................. 27
Auxiliary AC/DC Backup Power Supply.................................................... 29
Chapter 3 Using Front Display .................................................. 30
Display Operations................................................................................... 30
Navigation Buttons ................................................................................ 30
The DEMAND RESET Button .................................................................... 31
The TEST Button.................................................................................... 32
Navigating in Data Display Mode.............................................................. 32
Status Indicators ................................................................................... 33
Display Features.................................................................................... 34
Measurement Units................................................................................ 35
Data Displays........................................................................................... 36
TEST Mode Data Display......................................................................... 36
Billing Period Data Displays..................................................................... 36
Engineering Maximum Demand Data Display............................................. 40
Engineering Data Display........................................................................ 42
Waveform Display.................................................................................. 44
Harmonics Display ................................................................................. 44
Phasor Display ...................................................................................... 45
Setup Data Display ................................................................................ 45
Device Info Display................................................................................ 45
Device Diagnostics Display...................................................................... 47
Programming Mode ................................................................................. 48
Navigation Buttons ................................................................................ 48
Entering Numeric Values......................................................................... 48
Password Security ................................................................................. 49