16.3 Periodic Inspection
In addition to daily inspection, periodic inspection of frequency converters is al-
so necessary. The inspection cycle should be less than 6 months. For operation
details, please see table below:
Inspection
category
Inspection item
Inspection criteria
Solution
Power supply Voltage
Specified in nameplate
1P: 200...240 VAC
(-10 % / +10 %)
3P: 380...480 VAC
(-15 % / +10 %)
Power cable
Power cable
No color change or damage
Replace cable
Signal line
Signal line
Replace signal line
Terminal
connection
Crimp terminal
and cable / line
No loose connection
Tighten crimp
and terminal screw
Crimp terminal
and terminal block
Frequency
converter
Visual
appearance
No deformation
Contact with service
Fan
No color change
or deformation
Replace fan
No blockage
or contamination
Eliminate blockage
and clean fan
Cooling system
(radiator, inlet, outlet)
No blockage
or foreign matters
Eliminate blockage
and clear foreign matters
Printed circuit board
No dust or oil contamination
No discoloration or deforma-
tion
Clean printed
circuit board
Electrolytic capacitor
No leakage, color
change, crack or expansion
with safety valve shut down
Replace capacitor (must be
operated by service engi-
neers)
IGBT module
no dust, cotton or oil around
the module
Module without discolora-
tion, bulge or crack
Clear foreign matters or re-
place module
Accessories
Connection
No loose connection
Tighten terminal screw
Cable
No color change or damage Replace cable
Tab. 16-2: Periodic inspection list
VFC 3210
Bosch Rexroth AG
Maintenance
DOK-RCON04-VFC3210****-IT01-EN-P
217/253