Freescale Semiconductor, Inc.
System Setup
Jumper Settings of Controller Board
An isolation transformer should be used when operating off an AC power
line. If an isolation transformer is not used, power stage grounds and
oscilloscope grounds are at different potentials, unless the oscilloscope
is floating. Note, that probe grounds and, therefore, the case of a floated
oscilloscope are subjected to dangerous voltages.
The user should be aware, that:
• Before moving scope probes, making connections, etc., it is
generally advisable to power down the high-voltage supply.
• To avoid inadvertent touching live parts, use plastic covers.
• When high voltage is applied, using only one hand for operating
the test setup minimizes the possibility of electrical shock.
• Operation in lab setups that have grounded tables and/or chairs
should be avoided.
• Wearing safety glasses, avoiding ties and jewelry, using shields,
and operation by a personnel trained in high-voltage lab
techniques is also advisable.
• Power transistors, the PFC coil, and the motor can reach
temperatures hot enough to cause burns.
• When powering down; due to storage in the bus capacitors,
dangerous voltages are present until the power-on LED is off.
5.4 Jumper Settings of Controller Board
The MC68HC908MR32 control board jumper settings shown in
Figure 5-2 and Table 5-1 are required to execute the 3-phase AC motor
control application with dead time distortion correction. For a detailed
description of the jumper settings, refer to the MC68HC908MR32
Control Board User’s Manual (Motorola document order number
MEMCMR32CBUM/D).
DRM019 — Rev 0
MOTOROLA
Designer Reference Manual
System Setup
51
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