OnRobot HANWHA 3FG15 User Manual page 152

Maintenance
Neither use nor power on the VG grippers without filters. Dust, hair and larger particles can get
stuck in pump membranes and valve seats, causing permanent damage to the VG grippers.
DANGER:
Identify how often the filters need service and schedule
maintenance with a fixed period short enough to ensure a firm
grip at all times.
An overall inspection of the VG grippers must be performed
regularly and at least once every 6 months.
Never power the VG grippers without filters or with filters
mounted incorrectly. Failure to comply with this precaution can
cause irreversible failure of pump or valves.
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