Warning - Motorola M68HC08 Reference Manual

User Guide

6.3 Warning

Designer Reference Manual
112
Freescale Semiconductor, Inc.
This application operates in an environment that includes dangerous
voltages and rotating machinery.
Be aware that the application power stage and optoisolation board are
not electrically isolated from the mains voltage - they are live with risk of
electric shock when touched.
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 inadvertently 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 personnel trained in high-voltage lab techniques
are 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.
User Guide
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DRM028 — Rev 0
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