Yaskawa iQpump Micro Manuel d'utilisateur télécharger pdf (Page 200)

6.1 Inspection

Power electronics have limited life and may exhibit changes in characteristics or performance deterioration after years of use

under normal conditions. To help avoid such problems, it is important to perform preventive maintenance and periodic

inspection on the drive.

Drives contain a variety of power electronics such as power transistors, semiconductors, capacitors, resistors, fans, and relays.

The electronics in the drive serve a critical role in maintaining proper motor control.

Follow the inspection lists provided in this chapter as a part of a regular maintenance program.

Note: The drive will require more frequent inspection if it is placed in harsh environments, such as:

• High ambient temperatures

• Frequent starting and stopping

• Fluctuations in the AC supply or load

• Excessive vibrations or shock loading

• Dust, metal dust, salt, sulfuric acid, chlorine atmospheres

• Poor storage conditions.

Perform the first equipment inspection one to two years after installation.

Recommended Periodic Inspection

outlines the recommended periodic inspections for Yaskawa drive installations. Although periodic inspections should generally

be performed once a year; the drive may require more frequent inspection in harsh environments or with rigorous use. Operating

and environmental conditions, along with experience in each application, will determine the actual inspection frequency for

each installation. Periodic inspection will help to avoid premature deterioration in performance or product failure. Copy this

checklist and mark the “Checked” column after each inspection.

Periodic Inspection

WARNING! Electrical Shock Hazard. Do not connect or disconnect wiring while the power is on. Failure to comply can result in serious

personal injury. Before servicing the drive, disconnect all power to the equipment. The internal capacitor remains charged even after the

power supply is turned off. The charge indicator LED will extinguish when the DC bus voltage is below 50 Vdc. To prevent electric shock,

wait at least five minutes after all indicators are OFF and measure the DC bus voltage level to confirm safe level.

Table 6.1 Periodic Inspection Checklist

Inspection Area Inspection Points Corrective Action Checked

Main Circuit Periodic Inspection

General

• Overall check of the main power circuit and

ground terminals

Take appropriate actions (e.g., tightening loose

connections).

• Inspect equipment for discoloration from

overheating or deterioration.

• Inspect for damaged or deformed parts.

• Replace damaged components as required.

• The drive has few serviceable parts and may require

complete drive replacement.

• Inspect for dirt, foreign particles, or dust collection

on components.

• Inspect enclosure door seal if present. Replace

components if cleaning is not possible.

• Remove foreign particles and dust with a vacuum cleaner

to avoid touching parts.

Conductors and

Wiring

• Inspect wiring and connections for discoloration,

damage, or heat stress.

• Inspect wire insulation and shielding for wear.

• Repair or replace damaged wiring.

Terminals

• Inspect terminals for stripped, damaged, or loose

connections.

• Tighten loose screws and replace damaged screws or

terminals.

Relays and

Contactors

• Inspect contactors and relays for excessive noise

during operation.

• Inspect coils for signs of overheating such as

melted or cracked insulation.

• Check coil voltage for over or under voltage conditions.

• Replace damaged removable relays contactors or circuit

board.

Braking Resistors

• Inspect for discoloration of heat stress on or around

resistors.

• Minor discoloration may be acceptable.

• If discoloration exists check for loose connections.

Motor Periodic Inspection

Operation Check • Check for increased vibration or abnormal noise.

• Stop the motor and contact qualified maintenance

personnel as required.

Control Circuit Periodic Inspection

6.1 Inspection

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Yaskawa iQpump Micro Manuel d'utilisateur Page 200

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