Chapter 7 – Trouble Shooting & Maintenance
7-13
7.5 Maintenance
The Benshaw series of drive’s (Models SG, S4 and GX) are an industrial electronic product with advanced
semiconductor components. A reasonable life expectancy of 8 to 10 years can be expected. However, there are
factors that may affect their continued long term operation. Environmental issues (temperature and humidity) and
mechanical issues (vibration and connections) are the most common reasons for premature failure of drives. To
avoid problems, it is recommended to perform routine inspections of the drive.
7.5.1 Precautions
1) Be sure to remove the drive’s power input while performing maintenance. Lock out all sources of
power.
2) Preventive maintenance should always be performed by a trained technician.
3) Be sure to perform maintenance only after checking that the DC bus voltage has discharged. The
voltage between terminal P1-N (or P2-N) should be less than 30VDC. The DC bus capacitors in the
electronic circuit can still be charged even after the power is turned off. The DC bus LED is not a
definitive indication of the absence of DC voltage.
7.5.2 PeriodicInspectionSummary
Refer to the attached Table for specific frequency of inspection
1) The conditions of the installed location
a) Observe any physical damage to enclosure or enclosure degradation.
b) Any signs of liquid leakage into the enclosure.
c) Any signs of corrosion or rust resulting from leakage into the enclosure.
2) The conditions of the drive cooling. Causes for abnormal heating are:
a) Check for any deposits or dirt inside the enclosure, in the cooling fans/filters and the drive
fan(s). Remove with compressed air.
b) Check the rotating condition of the cooling fan(s)
3) Abnormal vibration
a) Are there any loose nuts or bolts as a result of the vibration?
b) Loose connections will show signs of heated connectors and wires. Tighten or replace.
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