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Revision January 2009 9-1
Chapter 9 Maintenance and Inspection
Delta AC servo drives are based on solid state electronics technology. Preventive maintenance is required to
operate this AC servo drives in its optimal condition, and to ensure a long life. It is recommended to perform
a periodic maintenance and inspection of the AC servo drive by a qualified technician. Before any
maintenance and inspection, always turn off the AC input power to the unit.
¾ Be sure to disconnect AC power and ensure that the internal capacitors have fully discharged before performing
the maintenance and inspection!
9.1 Basic Inspection
After power is in connected to the AC servo drive, the charge LED will be lit which indicates that the AC
servo drive is ready.
Item Content
General Inspection
z Periodically inspect the screws of the servo drive, motor shaft, terminal block
and the connection to mechanical system. Tighten screws as necessary as they
may loosen due to vibration and varying temperatures.
z Ensure that oil, water, metallic particles or any foreign objects do not fall inside
the servo drive, motor, control panel or ventilation slots and holes. As these will
cause damage.
z Ensure the correct installation and the control panel. It should be free from
airborne dust, harmful gases or liquids.
z Ensure that all wiring instructions and recommendations are followed; otherwise
damage to the drive and or motor may result.
Inspection before
operation
(Control power is not
applied)
z Inspect the servo drive and servo motor to insure they were not damaged.
z To avoid an electric shock, be sure to connect the ground terminal of servo
drive to the ground terminal of control panel.
z Before making any connection, wait 10 minutes for capacitors to discharge after
the power is disconnected, alternatively, use an appropriate discharge device to
discharge.
z Ensure that all wiring terminals are correctly insulated.
z Ensure that all wiring is correct or damage and or malfunction may result.
z Visually check to ensure that there are not any unused screws, metal strips, or
any conductive or inflammable materials inside the drive.
z Never put inflammable objects on servo drive or close to the external
regenerative resistor.
z Make sure control switch is OFF.
z If the electromagnetic brake is being used, ensure that it is correctly wired.
z If required, use an appropriate electrical filter to eliminate noise to the servo
drive.
z Ensure that the external applied voltage to the drive is correct and matched to
the controller.