Daily Checkin; Main Circuit; Chapter 6 Periodic Overhaul And Maintenance - Veichi AC300 Series Technical Manual

AC300 Series Vector Control Inverter Manual

Chapter 6 Periodic Overhaul and Maintenance

6.1 Safety Precautions
This chapter explains the safety rules in overhaul and maintenance.
● No operation under power connected state. Otherwise, there is danger of electric shock even
death.
● 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.
● No operation while cover/panel is dismantled. Otherwise there is danger of electric shock
even 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 wear loose clothes when install, debug, maintain. Related protective tools and
safeguard should be adopted.
● Tighten screw according to named torque. 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
touch 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 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 fluctuate badly;
 With serious vibration or impact;
 With dust, metal dust, salt, vitriol, chlorine;
Periodic Overhaul and Maintenance
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AC300 Series Vector Control Inverter Manual
 Bad storage environment;
● Daily checking
To avoid machine damage and to prolong life time, please check the following items everyday.
Items Checking content
Check if power supply meets the
Power supply requirement and whether there is
lack-phase.
Check whether it meets the table3-1
Surroundings
requirement.
Check whether the inverter or the motor
Cooling system heat or change color abnormally and
cooling fan working state.
Check if there is abnormal vibration or
Motor
noise.
Check whether output current is over the
Load rated value of the motor or the inverter and
has lasted for a period.
Cautions:
 No operation under power connected state. Otherwise, there is danger of electric shock death. Before
operating, please cut all related equipments power, ensure that the main circuit DC current has dropped
to safe range. And please operate after 5 mins.
● Periodic overhaul
Under normal state, one overhaul every 3 or 4 months is ok. Please confirm the actual overhaul period according to
the machine use condition and work circumstance while using the machine.

Main circuit:

Items Checking content
● Check insulated resistance;
Whole
● Check circumstance.
● Check whether the wire and connector
color changes, whether there is disrepair,
crack color change or aging in insulated
Electric connection layer.
● Check whether the connect terminals
are frayed, damaged or loose.
● Earth checking.
● Check if there is abnormal vibration or
Mechanical connection
noise or something is loose.
Periodic Overhaul and Maintenance
Treatment
Treat it as nameplate explains.
Make sure the problem and solve it.
Check whether it overload. Tighten screw.
Check whether cooling fan is dirty or stall
rotate.
Tighten machine and electric connection
and lubricate the machine components.
Make sure whether it overload and
whether the machine model is right.
Treatment
● Tighten and change bad component;
● Clear and improve circumstance.
● Change bad wire.
● Fasten terminals and change bad
terminals.
● Measure earth resistance and fasten
earth terminals.
● Tighten, lubricate and change the bad
components.
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