Panasonic AGM1CSEC16P, Reference Manual

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5.5 Safety Measures
5.5.1 General Safety Measures
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Precautions regarding system design
● In the system where the GM1 is used, malfunction may occur for the following reasons:
• Power on timing differences between the GM1 system and I/O devices or power devices.
• Response time lag when a momentary power failure occurs.
• Abnormality in the GM1 Controller, external power supply, or other devices.
In order to prevent a malfunction resulting in an error or accident of the overall system, take
adequate safety measures.
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Installation of an interlock circuit
● When controlling conflicting operations such as the motor rotation in clockwise or counter-
clockwise direction, provide an interlock circuit external to the GM1.
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Installation of an emergency stop circuit
● Provide an emergency stop circuit external to the GM1 to turn OFF the power supply of the
output device.
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Power supply sequence
● Start the GM1 only after I/O devices and power devices are energized.
● In case of stopping the operation of the GM1, have the I/O devices or power devices turned
OFF after the GM1 has stopped operating.
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Grounding
● When installing the GM1 next to devices that generate high voltages from switching, such as
inverters, do not ground them together. Connect an exclusive ground with a resistance of
100 Ω or less.
5.5.2 Momentary Power Failure
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Operations when a momentary power failure occurs
● If the duration of the momentary power failure is less than 10 ms, the GM1 continues to
operate. If the power is off for 10 ms or longer, operation changes depending on the
combination of units, the power supply voltage, and other factors. (In some cases, operation
may be the same as that for a power supply reset.)
5.5.3 Watchdog Timer
● The watchdog timer is a program error and hardware error detection timer.
5.5 Safety Measures
WUME-GM1H-02 5-15