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SA2102DPA Datasheet(PDF) 9 Page - Sames |
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SA2102DPA Datasheet(HTML) 9 Page - Sames |
9 / 16 page sames SA2102D 9/16 http://www.sames.co.za Motor pulses / kWh = ......... 2 LED pulses/kWh / DF_MO Where: LED pulses / kWh as calculated in formula 1 DF_MO is the dividing factor and depends on R1 and R0: R1 0 0 1 1 R0 0 1 0 1 DF_MO 64 32 16 8 Select Output (SO) Rated Condition Select (R0, R1, R2) LED pulses / kWh = ......... 1 The SA2102D has unique internal circuitry that can be user enabled to stabilize the LED output. When in FAST mode, connecting the SO input pin to Vdd will enable the LED pulse stability feature. Stabilizing the LED pulse output allows for shorter meter calibration times. Leaving the SO pin open or connecting to Vss will disable the LED pulse stability circuitry. Figure 9 indicates the operation of pulse stability. To calculate the LED output pulse rate (in STANDARD mode) and motor drive pulse rate for any meter ratings (I and V ) the following formulae can be used: 1160 x (1/DF_LED) x Where: I = Maximum Rated Mains current V = Nominal Mains Voltage DF_LED is the dividing factor and depends on R2, R1 and R0: The Rated Condition Select pins R0, R1 and R2 are inputs pins used to configure the SA2102D for different Maximum Rated Mains Currents and Nominal Mains Voltages. This feature allows for the use of different stepper motor gear ratios. MAX NOM NOM MA X 100 100 100 100 100 100 100 6400 3200 1600 800 6400 3200 1600 220V/10A 220V/20A 220V/40A 220V/80A 220V/6A 220V/30A 220V/60A 0 1 0 1 0 1 0 0 0 1 1 0 0 1 0 0 0 0 1 1 1 MOP and MON Outputs (Pulses/kWh) LED Output (Pulses/ kWh) Vnom / Imax R0 R1 R2 Table 3: Some meter constants available for several maximum currents (I ) and with a line voltage of 220V, while in STANDARD mode. MAX 3600 (V x I ) / 1000 NOM MAX R2 0 0 0 0 1 1 1 R1 0 0 1 1 0 0 1 R0 0 1 0 1 0 1 0 DF_LED 322 322 322 322 536 214 214 Table 3 shows some of the meter constants available for several maximum currents (I ) and with a line voltage of 220V while in STANDARD mode. Note that the values calculated using formulae 1 and 2 are close approximations to the values listed in table 3. The SA2102D has to be calibrated (using the voltage input) to give the exact value listed. MAX Table 1: LED Output Constants Table 2: MOTOR Output Constants Direction Select Input (DIRI) Depending on the state of the DIRI pin the energy to be measured can be in the positive direction only, or in the negative direction only, or in both directions. Connecting DIRI to VDD will result in energy only being measured in the positive direction. Energy flowing in the negative direction will not be measured. Connecting DIRI to VSS will result in energy only being measured in the negative direction. Energy flowing in the positive direction will not be measured. Connecting the DIRI pin to the DIRO output pin enables the bi-direction mode where energy is measured regardless of direction. |
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