MCP3909RD-3PH3 Microchip Technology, MCP3909RD-3PH3 Datasheet - Page 65

• Manufacturer Part Number: MCP3909RD-3PH3
• Description: REF DESIGN FOR MCP3909 W/18F2520
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-3PH3

• Main Purpose: Power Management, Energy/Power Meter
• Utilized Ic / Part: MCP3909, PIC18F2520, PIC18F4550
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

© 2008 Microchip Technology Inc.
6.8.2
The next step will be to calibrate the PHASE ANGLE correction, if desired. The
software will prompt the user if this calibration step is necessary. Then the following
dialog box will be given.
FIGURE 6-4:
At this point, the software will default to the value of 60 degrees for the phase delay.
The user can MODIFY these values to the exact phase delay based on calibrated
equipment readings.
Note that the dialog box uses the values for VCAL AND ICAL that were given during
configuration C1. This is because the user is expected to not change the currents and
voltages during this step, only the phase angle. If the voltages and currents change
between steps 1 and 2, the calibration will not be accurate.
Once the user selects the “OK” button, energy accumulation will occur and status can
be observed via the energy accumulation bar.
Section 5.3.7 describes the registers and equations that the software uses at this point
to calibrate the phase angle correction of the meter and PHy_DELAY register for the
appropriate phase.
3-Phase Energy Meter Calibration Software
Note:
Calibration Step 2 - Configuration C2
IMPORTANT! The equations that are hard-coded into the software subtract
60 degrees from the measured quantity. For this reason, it is expected that
the current lag the voltage during this calibration step.
Calibration Step C2 with calibration settings input boxes.
DS51643B-page 61