Bulletin No. 3020IM9503R6/98 Power Meter
December 1998 Appendix E—Using the Command Interface
1998 Square D All Rights Reserved 79
APPENDIX E—USING THE COMMAND INTERFACE
RESETTING DEMAND AND ENERGY VIA COMMUNICATIONS
Using System Manager Software (SMS-3000, SMS-1500, or PMX-1500), you can
reset Peak Demand Currents, Peak Demand Powers, Min/Max and the associ-
ated power factors. You can also clear accumulated energies. If you are not
using one of these software packages, you can perform these functions via
communications by entering the desired command code (see below) to register
7700.
Command
Code Description
4110 Reset min/max (PM-650 only)
5110 Reset peak demand currents
5120 Reset peak demand powers and associated average power factors
6210 Clear all accumulated energies
CHANGING THE VAR SIGN CONVENTION
The power meter offers two VAR sign conventions (see figures 8-2 and 8-3
in Chapter 8). The procedures below tell how to change the sign convention
via communications.
To change to the alternate sign convention, complete the following steps:
1. (SY/MAX or POWERLOGIC protocol only) Read register 7715.
2. Read register 2028, the value of the system password.
3. Write the value in register 2028 into register 7721.
4. Write the decimal value 2020 into register 7720.
5. Change to binary mode and read register 7755.
6. Change bit 0, the least significant or right-most bit, to a 1 and write the
new value back to register 7755.
7. Change back to decimal mode and read register 2028.
8. Write the value of register 2028 into register 7721.
9. Write the decimal value 2050 into register 7720. The changes are saved and
the power meter resets.
To return to the default sign convention, complete the following steps:
1. (SY/MAX or POWERLOGIC protocol only) Read register 7715.
2. Read register 2028, the value of the system password.
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