14.3 Periodic Inspection
In addition to daily inspection, periodic inspection of frequency converters is also nec‐
essary. 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
1-phase: 200~240 V
(-10 % / +10 %)
3-phase: 380~480 V
(-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 termi‐
nal screw
Crimp terminal
and terminal block
Frequency
converter
Visual
appearance
No deformation Contact service engineers
Fan
No color change or de‐
formation
Replace fan
No blockage or contami‐
nation
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 contami‐
nation
Clean printed
circuit board
DC bus capacitor
No leakage, color
change, crack or expan‐
sion with safety valve
shut down
Replace DC bus capacitor
(must be operated by
service engineers)
Accessories
Connection No loose connection Tighten terminal screw
Cable
No color change or
damage
Replace cable
Fig.14-2: Periodic inspection list
Bosch Rexroth AG
Maintenance
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
188/235
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