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User manual DC/DC-Module PM3Kxxx
Operation
a)
ZK
VS
DC
Source
Load
DC
Application
possible sources: DC-power line, PFC
possible load/charge: arbitrary
Parameter
mod_opmode:
0
vs_imax:
0 bzw. >0
vs_imin:
- desired current limit
zk_usoll:
Desired value DC-Link voltage, smaller than the
minimum occurring ZK voltage
vs_usoll:
desired output voltage
In this particular application case, the module functions as a typical electric power
supply: it maintains the output voltage constant in the desired value, vs_usoll, and
limits the current, during overcharge, to vs_imin. (Attention: vs_imin is negative,
because the direction of current is defined into the module). The parameter vs_imax
must stay at 0, so that no current can flow into the module. In some cases hereby it
can occur that the voltage runs high, as a result of offset errors, if no load is
connected. It is recommended in this case to allocate a small positive value of
approximately 1…3A to vs_imax, so as to be able to maintain the voltage on the
desired value.
The parameter zk_usoll is the desired value for the DC-Link voltage. If this falls below
this value, the ZK - voltage regulator tries to maintain the value. It does this by
preventing power to flow from the DC-Link into the VS- side. This means the output
voltage disintegrates or breaks down during overcharge. If this method is undesired,
but instead that a hard disconnection should take place during overcharge, zk_usoll
should be set to the possible minimum value 3500 (equivalent to 350V). If break down
or disintegration of the DC-Link voltage now occurs, the regulator can not intervene
and the module switches off due to low DC-Link voltage.
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D – 09439 Amtsberg