Formula to Calculate the Energy 64-bit INT in PM5000 Series

Issue
End user would like to obtain energy values via modbus register.


Product Line
PM5100, PM5110, PM5111, PM5310, PM5330, PM5331, PM5320, PM5340, PM5341, PM5560, PM5563

Environment
64-bit Energy Register

Cause
The energy values are stored in the INT64 bit format.

Resolution
*Warning:  Installation and maintenance of this device should only be performed by qualified, competent personnel that have appropriate training and experience with high voltage and current devices. Failure to follow the instructions / warnings in the Meter Installation Guide can result in permanent damage to the meter, severe injury or death.

Formula to calculate the Energy for 64bit INT :
Energy = ( lower 32bit value )+( Higher 32bit value *2³²)
Energy = ( lower 32bit value )+( Higher 32bit value *4294967296)

Example to calculate the Active Energy Delivered (32 bit Formula)
Read register 3204 and 3206 in UINT32
Formula :
Higher 32 bit value = register value of 3206= 0
Lower 32 bit value= register value of 3204 = 89550842
( lower 32bit value )+( Higher 32bit value *4294967296)= Energy
(89550842)+(0*4294967296) = 89550.842 kWh

Example to calculate the Active Energy Delivered + Received (16 bit Formula)
Read register 3212 through 3215 as UINT16
Energy = ((register 4) * (2^48)) + ((register 3) * (2^32)) + ((register 2) *  (2^16)) + (register 1)
Formula:
Energy = ((Reg 3212) * (2^48)) + ((Reg 3213) * (2^32)) + ((Reg 3214) *  (2^16)) + (Reg 3215)

Note:
If the user is using Firmware version 1.3.7 then there is an option for Float 32-bit energy registers ( Registers 2700 onwards). The float 32 registers are the replication of the INT64 bit registers.
For more information reference kb FA204140

Publikováno pro: Schneider Electric Česká republika