YASKAWA Varispeed G7 Manuel d'utilisateur télécharger pdf (Page 343)

8-2

Maintenance and Inspection

 Periodic Inspection

Check the following items during periodic maintenance.

• The motor should not vibrate or make unusual noises.

• There should be no abnormal heat generation from the Inverter or motor.

• The ambient temperature should be within the Inverter’s specifications.

• The output current value shown in U1-30 should not be higher than the motor or the Inverter rated current

for extended period of time.

• The cooling fan in the Inverter should be operating normally.

Before attempting any maintenance checks, make sure that the three-phase power is disconnected. With power

removed from the unit, the DC bus capacitors will stay charged for several minutes. The Charge LED in the

Inverter will glow red until the DC bus voltage is below 10VDC. To ensure that the DC bus is completely dis-

charged, measure between the positive and negative bus with a DC voltmeter set to the highest scale. Be sure

not to touch terminals immediately after the power has been turned off. Doing so can result in electric shock.

Apply power to the Inverter and conduct the following inspection:

Item Inspection Corrective Procedure

External terminals

Mounting bolts

Connectors

Are all screws and bolts tight? Tighten loose screws and bolts firmly.

Are connectors tight? Reconnect the loose connectors.

Cooling fins Are the fins dirty or dusty?

Clean off any dirt and dust with an air gun using

dry air at a pressure of 4 x 10

to 6 x 10

(4 to 6 bar, 55 to 85 psi).

All PCBs

Is there any conductive dirt or oil mist on

the PCBs?

Clean off any dirt and dust with an air gun using

dry air at a pressure of 4 x 10

to 6 x 10

(4 to 6 bar, 55 to 85 psi).

Replace the boards if they cannot be made clean.

Input Diodes

Output Transistors

Power Modules

Is there any conductive dirt or oil mist on

the modules or components?

Clean off any dirt and dust with an air gun using

dry air at a pressure of 4 x 10

to 6 x 10

(4 to 6 bar, 55 to 85 psi).

DC bus capacitors

Are there any irregularities, such as dis-

coloration or odor?

Replace the capacitor or Inverter.

Item Inspection Corrective Procedure

Cooling Fan(s)

Is there any abnormal noise or vibration,

or has the total operating time exceeded

20,000 hours.

Check U1-40 for the elapsed cooling oper-

ation time.

Replace Cooling Fan

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YASKAWA Varispeed G7 Manuel d'utilisateur Page 343

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