Ambient environment

Check the temperature, and humidity, and whether there is vibration, dust, gas, oil spray, and water droplets in the environment.

Visual inspection, and use instruments for measurement.

The requirements stated in this manual are met.

Check whether there are foreign matters, such as tools, or dangerous substances placed nearby.

Visual inspection

There are no tools or dangerous substances placed nearby.

Voltage

Check the voltage of the main circuit and control circuit.

Use multimeters or other instruments for measurement.

The requirements stated in this manual are met.

Keypad

Check the display of information.

Visual inspection

The characters are displayed properly.

Check whether characters are not completely displayed.

Visual inspection

The requirements stated in this manual are met.

Main circuit

Common

Check whether the bolts loose or come off.

Screw them up.

No exception occurs.

Check whether the machine is deformed, cracked, or damaged, or their color changes due to overheating and aging.

Visual inspection

No exception occurs.

Check whether there are stains and dust attached.

Visual inspection

No exception occurs.

Note: Discoloration of copper bars does not mean that they cannot work properly.

Conductor and wire

Check whether the conductors are deformed or their color change due to overheat.

Visual inspection

No exception occurs.

Check whether the wire sheaths are cracked or their color changes.

Visual inspection

No exception occurs.

Terminal block

Check whether there is damage.

Visual inspection

No exception occurs.

Filter capacitor

Check whether there is electrolyte leakage, discoloration, cracks, and chassis expansion.

Visual inspection

No exception occurs.

Check whether the safety valves are released.

Determine the service life based on the maintenance information, or measure them through electrostatic capacity.

No exception occurs.

Check whether the electrostatic capacity is measured as required.

Use instruments to measure the capacity.

Electrostatic capacity ≥ initial value × 0.85

Resistor

Check whether there is displacement caused due to overheat.

Olfactory and visual inspection

No exception occurs.

Check whether the resistors are disconnected.

Visual inspection, or remove one end of the connection cable and use a multimeter for measurement.

Resistance range: ±10% (of the standard resistance)

Transformer and reactor

Check whether there is unusual vibration sounds or smells.

Auditory, olfactory, and visual inspection

No exception occurs.

Electromagnetic contactor and relay

Check whether there are vibration sounds in the workshop.

Auditory inspection

No exception occurs.

Check whether the contacts are in good contact.

Visual inspection

No exception occurs.

Control circuit

Control PCB, connector

Check whether the screws and connectors loose.

Screw them up.

No exception occurs.

Check whether there is unusual smell or discoloration.

Olfactory and visual inspection

No exception occurs.

Check whether there are cracks, damage, deformation, or rust.

Visual inspection

No exception occurs.

Check whether there is electrolyte leakage or deformation.

Visual inspection, and determine the service life based on the maintenance information.

No exception occurs.

Cooling system

Cooling fan

Check whether there are unusual sounds or vibration.

Auditory and visual inspection, and turn the fan blades with your hand.

The rotation is smooth.

Check whether the bolts loose.

Screw them up.

No exception occurs.

Check whether there is decoloration caused due to overheat.

Visual inspection, and determine the service life based on the maintenance information.

No exception occurs.

Ventilation duct

Check whether there are foreign matters blocking or attached to the cooling fan, air inlets, or air outlets.

Visual inspection

No exception occurs.