V2.00
19837_EDEBD
A0227-2620-1_EN
51
System operation
7
System and Safety Device 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 . Screwed 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 sparking .
Check the control performance in automatic mode .
Check the cooling air setting (fans, temperature monitoring function):
Check that the controller temperature relay switches the fans on at 28 °C .
Check that the temperature monitoring switches the system off via controller at 48 °C .
Clean the filter 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 .
Limit temperatures:
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 current
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 input current
can be caused by an increasing proportion of harmonics or by a change in capacitance
of capacitors.