PM9109BFA Ver la hoja de datos (PDF) - South African Micro Electronic Systems
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componentes Descripción
Fabricante
PM9109BFA
South African Micro Electronic Systems
PM9109BFA Datasheet PDF : 18 Pages
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PM9109BF
Similarly by using (4)
Energy for 1 Display increment
= (24000/0.6107)Ws ... (24000/0.0573)Ws
= 39299.2Ws ... 418848.2Ws
= 0.0109kWh ... 0.1164kWh
Any value in this range can be chosen by programming Ks into the device.
How is the calibration factor, Ks, derived?
Ks =
(626 * EWs) / (VLR * ILR)
(5)
or Ks = (626 * 3600 * 1000 * EkWh) / (VLR * ILR) (6)
where
ILR
is rated line current
VLR is rated line voltage
Ews is energy for one Display increment in Ws
EkWh is energy for one Display increment in kWh
This formula is valid only if 16µA flows into current sense input for rated line
current ILR and 14µA flows into voltage sense input for rated line voltage VLR (in
other words - resistor adjustments as shown as example in STEP 1 and STEP 2
must be carried out).
For practical reasons it is standard to use 0.1kWh for 1 Display increment.
Using formula (6) :
Ks = (626 * 3600 * 1000 * 0.1) / (120 * 200) = 9390
It can be derived that a value of Ks=9390 must be programmed into the device for
0.1kWh for one Display increment, if ILR =200A and VLR =120V. This constant
may vary ±10% for calibration purposes.
Using this approach it is shown that:
1) the SA9109B device can be adjusted to any rated values (even orders of
magnitude higher or lower than in this example);
2) ranges for energy per Display increment can be calculated.
This approach also applies to the SA9110A.
8/18
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