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dsPICDEM? MC1L 3-Phase Low Voltage Power Module
1.2.6.2
ISOLATED FEEDBACK
Table 1-2 gives the scaling of the isolated feedback signals as the system is delivered.
TABLE 1-2:
ISOLATED SCALING
Feedback Signal
Inverter Output (R and Y) Hall Current Sensor
DC Input Hall Current Sensor
DC Bus Voltage via SPI? Channel
Scaling
12 A / V with 2.5V = 0A
12 A / V with 2.5V = 0A
230 = 58.7V (1LSB = 0.255V)
1.2.6.3
NON-ISOLATED FEEDBACK
As the system is delivered, access is not given to the non-isolated feedback signals to
ensure user safety. If an experienced user wishes to access these signals, they
should read Section 1.5 “Detailed Description of Operation” along with Section
1.6.3.4 “Accessing The Additional (non-isolated) Feedback Signals” . Note that
once the isolation barrier is bridged, all signals can no longer be considered to be
isolated from the power circuit. When operating in the non-isolated configuration, the
Hall current sensors and SPI voltage feedback signals are also available.
The scaling for the signals as the system is delivered is given below. For details of
changing the scaling, see Section 1.6.3 “Changing Current Feedback and Trip
Scaling” .
TABLE 1-3:
NON-ISOLATED SCALING
Feedback Signal
R, Y, B Inverter Leg Shunts
DC Bus Shunt
Brake Chopper Shunt
DC Bus Voltage
R. Y, B Inverter Output Voltages
Scaling
12.0 A/V with 2.5V = 0A*
11.9 A/V with 2.5V = 0A*
5.45 A/V
13.05 V/V
13.05 V/V
* If a large rate of change of current occurs due to the use of a load with low
inductance, the voltage across the self-inductance of the shunts will cause an
additional shunt voltage that will add to the shunt feedback signals.
DS70097A-page 12
? 2003 Microchip Technology Inc.
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