July 2013 3.42 CML 110 capacitor module 417
Example:
During operation at 24 V, a total current of 10 A is required for switching the
control components on. This corresponds to an ohmic load of 2.4 ohms. In
addition, the voltage for the 24 V components may not sink below 18 V (e.g.
switching voltage of the contactors), for example.
This means:
t = 2.4 Ohm x 8.3 F x ln(24 V/18 V)
t = 5.73 s
If the line voltage fails, then in the best case the voltage will not fall below 18 V
until 5.73 seconds have passed. This is significantly longer than 1 second, and
so the CML 110 is suitable for LIFTOFF here.
If the capacitance of the CML 110 should not suffice, then you can also switch
more than one CML 110 in parallel. However, here you must note that a
maximum charging current of 2.4 A per CML 110 is to be expected at switch-
on. The full power of the 24 V power supply unit can only be used once all
CMLs have finished charging.
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