If this function is used, no homing should be carried out during operation. This
would reset/change the positions and the override function could not work properly.
There are two internal functions which monitor the DC link voltage in order to avoid
a premature ageing of the capacitors.
If the ripple of ru14 exceeds 10 times within 16 ms a power unit-dependent value
(typically 120V at 400V devices), error 52: ERROR undervoltage phase (E.Uph) is
triggered.
The second function is only active with 3-phase inverters. This function monitors
the ripple of the DC link within a certain frequency range. Error 52: ERROR un-
dervoltage phase (E.Uph) can also be triggered if the frequency of the fluctuation
of ru14 indicates that an input phase is missing.
Since a ripple of the DC link voltage can also be triggered by the application (load
cycle or oscillations of the controller), the more sensitive, frequency-dependent
monitoring function can be switched off with pn42 or it can be used only as warning
function.
If the UPS mode is active (chapter 4.4.21 UPS mode ), the phase failure detection
is generally deactivated.
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