AC70 VC CONTROL FREQUENCY INVERTER MANUAL
PERIODIC OVERHAUL AND MAINTENANCE
60
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
death.
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Before operation, please cut all related equipments power, ensure that the main circuit
DC current has dropped to safe range. And please operate after 5 mins.
●
No operation while cover/panel is dismantled. Otherwise there is danger of electric shock
death.
●
Do not dismantle the cover or PCB under power connected state. Otherwise there is
danger of electric shock death.
●
Only professional person can maintain or change fittings. Otherwise there is danger.
●
Do not ware loose clothes while install, debug, maintain. Rated protective tools and
safeguard should be adopted.
●
Tighten screw according to named moment. If main circuit wire connection is loose, there
is danger of overheat fire.
●
Machine and motor earth must be reliable. Otherwise there is danger of electric shock if
touches the cover.
●
While operation, please follow the ESD regulations. Otherwise the inverter maybe
damaged.
●
Do not change the circuit or structure of the inverter. Otherwise the inverter maybe
damaged.
●
Please confirm the rotate direction while no-load.Wrong direction can bring body injury or
huge wealth loss.
●
Do not use damaged machine. Otherwise there is danger of accident.
6.2 Overhaul
Frequency inverter is composed by semi-conductive component, 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 monthes after installation. The
overhaul period should be shorter while under cases as below.
High temperature, high altitude;
Start and stop frequently;
AC power supply or load fluctuates badly;
With bad wave or impact;
With dust, metal dust, salt, vitriol, chlorine;
Bad store condition;
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Daily checking
To avoid machine damage and to prolong life time, please check the following items every day.
Items
Checking content
Treatment
Power supply
Check if power supply meets the
requirement and whether there is
lack-phase.
Treat it as nameplate explains.
Surroundings
Check whether it meets the table3-1
requirement.
Make sure the problem and solve it.
Cooling system
Check whether the inverter or the motor
heat or change color abnormally and cooling
fan working state.
Check whether it overload. Tighten screw.
Check whether cooling fan is dirty or rotate
block.
Motor
Check if there is abnormal vibration or noise.
Tighten machine and electric connection
and lubricate the machine components.
Load
Check whether output current is over the
rated value of the motor or the inverter and
have lasted for a period.
Make sure whether it overload and whether
the machine model is right.
