Issue
How to Display Energy as a fixed Kilo (kwh) or Mega (mwh) value on the front panel display of a Series 2000, 3000, 4000 Circuit Monitor or Series 800 Power Meter. (Energy Display Precision)
Product Line
CM2000 Series
CM3000 Series
CM4000 Series
PM800 Series
Environment
Configuring the Resolution or scaling for energy values.
Cause
Customer would like to change the scale or resolution of their energy value on the front display to be more precise.
Resolution
By default the Series 2000, 3000, 4000 Circuit Monitor and Series 800 Power Meter will auto scale the Watt hour reading from 00,000 kWh to 999.999 MWh. The display of each meter can be configured to display a fixed unit and fixed decimal place. Energy Display Precision can be configured on each meter by writing the values listed below to the each register of the meter.
The values can be written to each meter's registers by using a Modbus Read/Write software, or through the front panel display of the meter. Refer to each device reference manual for details on how to read/write registers from the front panel.
Here is a link to a Modbus Read/Write Utility called Modbus Tester, which can be used to write to the registers in each meter: Video: What is Modbus Tester and how do I use it?
For CM2000 Series meters:
The CM2000's meter display can be configured for various resolutions (maximum value illustrated for each selection). The chart below shows various resolutions that the energy scale can support.
Write the number from the chart below to register 2027 to make the desired changes.
| Values (number) | Resolution |
| 10 | 999999 kilo |
| 11 | 99999.9 kilo |
| 12 | 9999.99 kilo |
| 13 | 999.999 kilo |
| 20 | 999999 mega |
| 21 | 99999.9 mega |
| 22 | 9999.99 mega |
| 23 | 999.999 mega |
EXAMPLE: If you want to view the CM2000's meter display at up to 9999.99 MWh, then you would write a value of 22 to register 2027.
For CM3000, CM4000 or PM800 Series Meters:
In order to change the Energy Display Precision on CM3000, CM4000 or PM800 series meters, 4 different registers need to be written:
1- Write value of 9020 to register 8000
2- Write value of ## to register 3215
3- Write value of 1 to register 8001
4- Write value of 9021 to register 8000
Replace ## with the number shown below that corresponds to the units you would like to display:
| Values (number) | Resolution |
| 0 | Auto range (default) |
| 10 | 999999 kilo |
| 11 | 99999.9 kilo |
| 12 | 9999.99 kilo |
| 13 | 999.999 kilo |
| 20 | 999999 mega |
| 21 | 99999.9 mega |
| 22 | 9999.99 mega |
| 23 | 999.999 mega |
All other values will default to auto range.
NOTE: These register values can be written individually or as a block.
Once 9021 is written to register 8000 the meter will reset and the change will take effect.
EXAMPLE: PM820 is default to rotate energy precision by default and customer wants to change it to show fixed Mwh with two decimal place.
1- Register: 8000, Value: 9020
2- Register: 3215, Value: 22
3- Register: 8001, Value 1
4- Register: 8000, Value 9021
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