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6.3.1 System and safety devices maintenance
In order to ensure that your system functions properly and has a long service life, perform
the following checks after commissioning and then on an annual basis.
Check and re-tighten all connections. Screw connections may become loose at the
beginning due to thermal stress.
Check fuses, safety devices and switching equipment. Contactors are wearing parts.
If the contactor is intact, switching must take place without excessive formation of
sparks.
Check the control performance in automatic mode.
Check the cooling air setting (fans, temperature monitoring function):
- Temperature relay of controller switches ventilators on at 28°C,
- Temperature monitoring switches system o via controller at 48°C.
Clean the lter mats if necessary, depending on how dirty they are.
Visual inspection of capacitors for leaks (a reliable encapsulation of the dielectric is a
prerequisite for the long life of the capacitor).
Examine the current input and capacitor terminal voltage once every three months.
Check the reactive energy consumption on the basis of the electricity bill.
6.3.2 Temperature limits
Valid for systems in cabinets:
+ 35° C on a 24-hour average
+ 20° C on an annual average
+ 40° C short-term highest value
- 10° C lowest value
The above information applies particularly to reactor-connected systems. The cur-
rent consumption and the temperature of these systems must be checked regularly
so that overloading of the capacitors can be detected at an early stage. A higher in-
put current can be caused by an increasing proportion of harmonics or by a change
in capacitance of capacitors.
Maintenance
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