AC90 TENSION CONTROL FREQUENCY INVERTER MANUAL BASIC OPERATION AND TRIAL RUN
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Chapter 6 Periodic Overhaul and Maintenance
6.1 Safety Precautions
This chapter explains the safety rules in overhaul and maintenance.
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No operation under power connected state. Otherwise, there is danger of electric shock
even death.
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Before operation, please cut all related equipments power, ensure that the main circuit DC
current has droped to safe range. And please operate after 5 mins.
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No operation while cover/panel is dismantled. Otherwise there is danger of electric shock
even death.
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Do not dismantle the cover or PCB under power connected state. Otherwise there is
danger of electric shock death.
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Only professional person can maintain or change fittings. Otherwise, there is danger.
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Do not wear loose clothes when install, debug, maintain. Related protective tools and
safeguard should be adopted.
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Tighten screw according to named torque. If main circuit wire connection is loose, there is
danger of overheat fire.
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Machine and motor earth must be reliable. Otherwise, there is danger of electric shock if
touch the cover.
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While operation, please follow the ESD regulations. Otherwise, the inverter maybe
damaged.
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Do not change the circuit or structure of the inverter. Otherwise, the inverter maybe
damaged.
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Please confirm the rotate direction while no-load. Wrong direction can bring body injury or
huge wealth loss.
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Do not use damaged machine. Otherwise, there is danger of accident.
6.2 Overhaul
Frequency inverter is composed by semi-conductive components, passive electronic component and motive component.
All of these components have useful life. Even under normal working environment, some of the components can not
work after the life time. To avoid malfunction, daily checking, periodic overhaul, component changing and other
maintenance should be carried out to prevent. We suggest one overhaul every 3-4 months after installation. The
overhaul period should be shortened while under cases as below.
High temperature, high altitude;
Start and stop frequently;
AC power supply or load fluctuant badly;
With serious vibration or impact;
With dust, metal dust, salt, vitriol, chlorine;
Bad storage environment;
