Maxim Integrated MAX78630+PPM Evaluation Kit - Manual (Page 6)

MAX78630+PPM Evaluation Kit User Manual
6 Rev 0
1.4 Safety and ESD Notes
EXERCISE CAUTION WHEN LIVE AC VOLTAGES ARE PRESENT!
Do not connect test equipment, ICE emulators or external development boards
directly to the MAX78630+PPM hardware. Damage to the MAX78630+PPM and
external equipment will occur due to the MAX78630+PPM’s “high side” reference
topology. The MAX78630+PPM’s V3P3 (i.e., “high side”) is connected directly to
Neutral (Earth Ground) or Line Voltage, creating a ground reference disparity with
any properly grounded external equipment.
The board components and firmware settings are designed to operate with the following nominal AC electrical
ranges:
Voltage
Current Line Frequency
10-400V AC 10mA – 50A 46-64Hz
The maximum current is determined by the current transformer (CT) that is provided with this EV kit:
CR Magnetics model no. CR8449-2500-N.
1.5 Testing the MAX78630+PPM EV Board Prior to Shipping
Before every EV kit is shipped, the board (and sensors) undergoes a single-load point calibration using precise
energy source equipment. The device temperature is also calibrated at the same time. Results printed out on
paper and included with the EV kit.
Note that the board is calibrated using the marked CTs included with the kit. Therefore, CT1 should be
connected to I1, CT2 to I2, and CT3 to I3.