5 Maintenance
5.1 General
All work may only be done by qualified personnel. The security must be ensured as
follows:
• Disconnect power supply at MCCB
• Secure against restarting
• Await discharge time of capacitors
(if necessary controlling by measurement at „+“ and „-“, respectively at „++“ and „--“)
• Ensure voltage free status by measurement
In order to avoid premature ageing and avoidable malfunctions, the measures men-
tioned below must be carried out in the appropriate cycle.
cycle
function
Constant
Pay attention to unusual noises of the motor (e.g. vibrations) as well as
of the drive converter (e.g. fan).
Pay attention to unusual smells of the motor or drive converter (e.g.
evaporation of capacitor electrolyte, braise of the motor winding).
Monthly
Check unit for loose screws and plugs and if necessary tighten up.
Clean drive converter from dirt and dust deposits. Pay attention espe-
cially to cooling fins and protective grid of the fans.
Examine and clean extracted air filter and cooling air filter of the con
-
trol cabinet.
Examine function of the fans of the KEB COMBIVERT. The fan must
be replaced in case of audible vibrations or squeak.
Make a visual leak test of the cooling circuit for water-cooled drive
converters.
Table 10: Maintenance cycles
44
GeNerAL
