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7 Periodic Inspection and Maintenance
NOTICE
Observe correct electrostatic discharge (ESD) procedures when touching the drive. Failure to obey can cause
ESD damage to the drive circuitry.Follow cooling fan replacement instructions. Replace all fans when performing maintenance
to help ensure maximum useful product life. Improper fan replacement could cause damage the drive.Do not use unshielded
wire for control wiring. Use shielded twisted-pair wires and ground the shield to the ground terminal of the drive. Failure to
comply may cause electrical interference resulting in poor system performance.Do not change the drive circuitry. Failure to obey
can cause damage to the drive and will void warranty. Yaskawa is not responsible for modifications of the product made by the
user.Make sure that all connections are correct after you install the drive and connecting peripheral devices. Failure to obey can
cause damage to the drive.Comply with proper wiring practices. Connect motor input terminals U, V and W to drive output
terminals U/T1, V/T2, and W/T3. The phase order for the drive and motor should match. The motor may run in reverse if the
phase order is backward.Turn the drive ON (Run) and OFF (Stop) a maximum of one time each 30 minutes with the MC on the
power source side to extend the service life of the relay contacts and electrolytic capacitors in the drive. Run and Stop the motor
as much as possible with the drive. The drive can fail if users frequently turn the drive ON and OFF with the MC on the power
source side to Run and Stop the drive. Incorrect operation can decrease the service life of the relay contacts and electrolytic
capacitors.Do not connect or operate damaged equipment or equipment with missing parts. Failure to obey can cause damage
to the drive and connected equipment.
◆
Inspection
Power electronics have limited life and can show changes in performance and deterioration of performance after
years of use in usual conditions. To help prevent these problems, it is important to do preventive maintenance and
regular inspection, and replace parts on the drive.
Drives contain different types of power electronics, for example power transistors, semiconductors, capacitors,
resistors, fans, and relays. The electronics in the drive are necessary for correct motor control.
Follow the inspection lists in this chapter as a part of a regular maintenance program.
Note:
Examine the drive one time each year at a minimum.
The operating conditions, environmental conditions, and use conditions will have an effect on the examination frequency for connected
equipment.
Examine the drive more frequently if you use the drive in bad conditions or in these conditions:
• High ambient temperatures
• Frequent starting and stopping
• Changes in the AC power supply or load
• Too much vibration or shock loading
• Dust, metal dust, salt, sulfuric acid, or chlorine atmospheres
• Unsatisfactory storage conditions.
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Recommended Daily Inspection
Table 7.1 gives information about the recommended daily inspection for Yaskawa drives. Examine the items in
Table 7.1 each day to make sure that the components do not wear out or fail. Make a copy of this checklist and put
a check mark in the "Checked" column after each inspection.
Inspection Area
Motor
Cooling System
Surrounding Environment
358
Table 7.1 Daily Inspection Checklist
Inspection Points
• Check the load coupling.
Examine for unusual oscillation
• Measure motor vibration.
or noise coming from the motor.
• Tighten all loose components.
• Check for a load that is too
• Tighten loose screws.
Examine for unusual heat from
the drive or motor and visible
• Check for a dirty heatsink or
discoloration.
• Check the ambient
• Check for a clogged or dirty
Examine the cooling fans,
circulation fans, and circuit board
• Use the performance life
cooling fans.
Remove the source of
Make sure that the installation
contamination or correct
environment is applicable.
unsatisfactory environment.
YASKAWA ELECTRIC SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
Corrective Action
heavy.
motor.
temperature.
fan.
monitor to check for correct
fan operation.
Checked
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