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dsPICDEM? MC1H 3-Phase High Voltage Power Module
Removing the PFC inductor from the circuit:
? Follow the procedure given in Section 1.5.2 “Accessing The System” for
accessing the unit.
? De-solder L1. This can be done from the top of the PCB.
? Solder a wire between J4 and J6. The wire size should be 1 mm 2 (18 AWG) with a
minimum voltage rating of 600V and suitable for operation up to 105°C. Note that
the wire should be no longer than 75 mm (3") in length and should be cropped to
ensure that the maximum length of lead protruding below the PCB is 4 mm.
? If required, replace the input fuse with a 7-8A part of the same type (Time Lag,
High Breaking Capacity and 250V or greater voltage rating).
? Once the modification is complete, install the lid ensuring all the screws are
replaced.
? Note that the maximum continuous limit on input current increases to 7A (RMS)
limited by the soft start NTC.
1.5.3.4
ACCESSING THE ADDITIONAL (NON-ISOLATED) FEEDBACK SIGNALS
All the non-isolated feedback signals are brought to a series of links that run along the
edge of the isolation barrier. In order to access these signals, the user should rigidly
carry out the procedure given below. Failure to do so could represent a safety hazard
to the user as the isolation barrier is bridged.
? Follow the procedure given in Section 1.5.2 “Accessing The System” for
accessing the unit.
? Disconnect the input wiring from the AC supply outlet.
? Wire in a safety isolation transformer with a suitable rating between the AC supply
outlet and the AC input to the system. The supply to the unit should now be
“floating”.
? The user should satisfy themselves that the isolation transformer is wired correctly
and the insulation is intact.
? Ensure that the earth (ground) continuity is maintained to the unit.
? Solder a wire between J13 and J5. The wire should be 1.0-1.5 mm 2 (18-16 AWG)
with a minimum voltage rating of 600V and suitable for operation up to 105°C. It
should be the standard color used for earth (ground) cabling in the user's country
(e.g., green for U.S.). This link is connecting the -DC bus to the incoming earth
(ground).
? In order to make the links for the non-isolated signals; it is recommended that two
0.3" pitch, 14-pin DIL resistor packages be used. These should be of the
“straight-through” type with 7 independent resistors. The suggested value is
330 ? , as this will provide some ESD protection without too high of a source
impedance being introduced. Note that LK28 has no circuit connections and is
provided to allow the second DIL resistor package to be installed. If the user
decides to fit links or individual resistors, these should be installed so that not
more than 4 mm of lead protrude beneath the PCB.
? Note that all signals to and from the system are now referenced to the -DC bus
that is at earth (ground) potential. The isolation transformer is providing the safety
isolation. The digital 0V of the control card is permanently connected to the
enclosure chassis and is therefore also referenced to ground.
? Once the modification is complete, install the lid ensuring all the screws are
replaced.
DS70096A-page 34
? 2003 Microchip Technology Inc.
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