The output cables connected to terminals "+" and "–" of every
power supply should be installed with an identical length and
cross-section (or the same impedance) to the common external
•The power supplies connected in parallel must be switched
simultaneously using a common switch in the mains supply line
(e.g. using the main switch available in control cabinets).
•The output voltages of the power supplies must be measured
under no-load operation before they are connected in parallel
and are permitted to differ by up to 50 mV. This usually corresponds
to the factory default setting. If the output voltage is
changed in case of variable power supplies, the "–" terminals
should first be connected and then the voltage difference between
the "+" output terminals measured under no-load conditions
before these are connected. This voltage difference must
not exceed 50 mV.
With a direct galvanic connection in parallel of more than two
SITOP power supplies, further circuit measures may be necessary
for short-circuit and overload protection!