Application for PM2812 and PM2813 D - 5
The channels 1 and 2 operate in the Constant Current mode, and Channel 3 in
the Constant volta
e mode.
This example will not work if the current throu
h the load decreases below 10A.
Then the current contribution of Channel 3 is reduced to 0A, and either Channel
1 or Channel 2 (or both) will enter the Constant Volta
e mode (at 10.1V). As there
are now at least two channels in Constant Volta
e mode, the one with the lowest
Vset (Channel 3) will activate its down pro
rammer, sinkin
about 0.5A. If you are
not quite certain about the minimum current required, you are advised to use the
procedure
iven under case 3. Then you must adjust all channels exactly to 10V.
Case 3: Constant Volta
e, Output Current from 0A to the maximum
This needs the most care to prevent a down pro
rammer to become active,
because all channels must be set exactly to the same volta
e. This can best be
done at low output currents. Do this as follows. Connect the channels in parallel.
Connect a load that allows the required volta
e and needs a small current, for
example 1% of the required maximum current. Set all channels to the required
Constant Volta
e value and to an equal part of the required maximum current. If
the volta
es from all channels are exactly equal, then all channels will supply an
equal part of the current. If a channel does not supply current (readback 0.00A),
select this channel and use the -V+ button to carefully increase the volta
e until
the channel starts to supply current.
Check if the other channels still supply current. If not, you may have increased the
volta
e of one channel to much. If all channels supply current, disconnect the load
and connect the real load.
