MAINTENANCE
The SD750 Series drives are industrial electronic products that contain advanced semiconductor elements.
For this reason, temperature, humidity, vibrations and worn components can affect performance. To avoid
any possible irregularities, it is recommended to carry out periodic inspections.
Warnings
Make sure to disconnect the drive from the power supply while performing maintenance.
Make sure to check that the DC bus voltage has been fully discharged before servicing. The voltage
between the bus terminals (+ HVDC and -HVDC) must be less than 30Vdc. Note that the DC bus
capacitors of the electronic circuit may remain charged even if the mains supply is disconnected.
The correct output voltage of the drive can only be measured by using an RMS voltage meter. Others
voltage meters, including digital voltage meters, would give incorrect readings due to the high switching
of the frequency PWM.
Routine Inspection
Make sure to check the following points before handling the drive:
• Installation site conditions.
• Drive cooling system conditions.
• Excessive vibrations in the motor.
• Excessive overheating.
• Normal output current value on the monitor.
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