Datasheet

YR20.246
Y-Series
24-28V, 20A, DUAL REDUNDANCY MODULE
11. AUTOMATED LOAD SHARING
Drawing even current from both power supplies in a redundancy application can provide a longer service life of the
redundant power supply system. An evenly shared current can avoid that one of the two units is getting much hotter
than the other, which reduces the lifetime of the power supply system. The YR20.246 redundancy module is equipped
with an automated load share feature, which can compensate a certain voltage unbalance between the two power
supplies connected to the inputs.
However, to reduce the losses of the active circuit in the redundancy module, the individual output voltages shall be
set as close as possible. The three LEDs on the front of the unit help to indicate if adjustment is necessary.
Fig. 11-1 Load sharing
typ. 90mV
typ. 370mV
Input 1
Input 2
OK
+
+
Input 1
Input 2
OK
+
+
Input 1
Input 2
OK
+
+
Input 1
Input 2
OK
+
+
Input 1
Input 2
OK
+
+
Automated load sharing possible
Automated load sharing not possible
"Load Share OK" contact is closed
"Load Share OK" contact is open
To optimize power losses, reduce the output voltage
of the power supply, where the yellow LED is on.
V
OUT1
> V
OUT2
V
OUT1
< V
OUT2
V
OUT1
= V
OUT2
typ. 370mV
typ. 90mV
Input 1
Input 2
OK
+
+
Reduce output voltage
of power supply 1
Reduce output voltage
of power supply 2
Optimal load sharing and
minimal power losses
The active load share feature of the YR20.246 has a similar effect and benefit as the feature “Parallel Mode” (soft
output characteristic), which is available on larger PULS power supplies.
Jul. 2017 / Rev. 1.4 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone [phone] Germany
9/19