Motorola M68HC08 manual Designer Reference Manual DRM028 Rev 112 User Guide

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

User Guide

6.3 Warning

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.

Designer Reference Manual		DRM028 — Rev 0
112	User Guide	MOTOROLA
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