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dsPICDEM? MC1L 3-Phase Low Voltage Power Module
Using output connections 6 and 7, the user may connect an external braking resistor.
The user should consider the maximum and average power to be dissipated at the
required DC bus voltage when considering the resistor value. They should also
consider the peak allowable resistor current of 20A. For example, if regulating at 24V
then a 1.2 ? minimum value should be used which would allow 480W (at most) to be
dissipated.
The user may feed in a DC supply using output connections 5 and 7. Using these
terminals, the input current rating increases to 20A (RMS) continuous, but the inverter
output current rating is unaffected. Thus more output power may be used. Note that if
using the auxiliary DC input, the internal fuse, soft-start, reverse voltage and over-cur-
rent protection is bypassed. It is up to the user to ensure adequate external protection
circuitry is used and incoming DC voltage is regulated.
1.2.3
Connecting To The Control Board
The system has been designed so that the Microchip dsPICDEM MC1 Motor Control
Development Board (02-01648) plugs directly into the 37-pin, D-Type connector.
Section 1.8 “User Signal Connector Pinout (37-Pin, D-Type)” contains details of
the pin allocation.
Correct operation with the use of an extension cable can not be guaranteed as it may
introduce additional noise. If an extension is used, it should be as short as possible
and shielded cable should be used.
The power module derives its low voltage power supplies from the control PCB. The
supplies on the isolated supply are taken directly from the control PCB via the 37-pin
connector. The supplies on the live side of the isolation barrier are derived using an
isolating DC-DC converter that is connected to the digital +5V supply input on the
37-pin connector. In this way, the power module may be used at any input voltage up
to the maximum. This arrangement is shown in Figure 1-4.
DS70097A-page 8
? 2003 Microchip Technology Inc.
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