Troubleshooting - Electra DNG 100 Service Manual

13.

TROUBLESHOOTING

13.1 Precaution, Advise and Notice Items
13.1.1 High voltage in Indoor and Outdoor unit electrical assembly
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Open the Outdoor unit controller assembly only after one minute from power off.
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Whole controller assembly, including the wires, connected to the Outdoor unit may have the
potential hazard voltage when power is on.
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Touching the Outdoor unit controller assembly may cause an electrical shock.
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Do not touch the naked lead wire and don't insert finger, conductor or anything else into the
controller when power is on.
13.1.2 Charged Capacitors
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Large capacity electrolytic capacitors are used in the outdoor unit controller and driver.
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Charging voltage (380VDC) remains after power is down.
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Discharging takes about one minute after turned off.
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Touching the outdoor unit electrical assembly before discharging may cause an electrical
shock.
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Measure the electrolytic capacitors voltage to be below 50VDC before further checking
electrical assembly parts.
13.1.3 Advisory Notes
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When open the Outdoor unit electrical assembly, don't touch the soldering pin by hand or by
any conductive material.
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When connecting or disconnecting the connectors on the PCB, hold the whole housing, don't
pull the wire.
¾ When Power Up – the outdoor and indoor unit electrical assemblies, including the
wiring, are under HIGH VOLTAGE!!!
¾ Never open the outdoor or indoor units before turning off ALL Power sources!!!
¾ When turned off, the outdoor unit electrical assembly is still charged (400V)!!!
¾ DC capacitors are discharging for about 1 Minute after power is OFF.
¾ Touching the electrical before discharging may cause an electrical shock!!!
¾ For safe handling of the electrical assembly please refer to section 13.1 above.
SM OU12HP 2-E.2 GB
WARNING!!!
CONTENTS
TROUBLESHOOTING
13-1