Beckhoff PS3011-2440-0000, Documentation

Page: 37 / 43

Application notes
PS3011-2440-0000 37 Version: 1.0
4.8 Parallel use to increase power
Power supplies from the PS3xxx series can be connected in parallel to increase the output power.
• The output voltage must be set to the same value (±100 mV) in "Single Use" mode and with the same
load conditions on all devices, or the units can be left with the factory settings.
• After the settings have been made, the jumper on the front of the device must be changed from "Single
Use" mode to "Parallel Use" mode in order to achieve load splitting.
◦ In "Parallel Use" mode the output voltage is regulated such that the voltage at no load is approx.
4% higher than at nominal load. See also Output [
}
13] chapter.
◦ If no jumper is plugged in, the device is in "Single Use" mode. The factory setting is also the
"Single Use" mode.
• If more than three devices are connected in parallel, a fuse or circuit breaker with a rated current of
50 A or 63 A is required at each output. Alternatively a diode can be used.
• Energize all devices simultaneously to avoid overload hiccup mode.
If the output has been in hiccup mode due to overload or short circuit and the required output current is
higher than the current of a device, it may be necessary to ramp up and shut down the input power
(turn off for at least five seconds).
Restrictions:
• Maintain an installation distance of 15 mm (left/right) between two power supplies.
• Do not install the power supplies above each other.
• In "Parallel Use" mode power supplies should only be used in the standard installation position
(terminals on the underside of the device), not in other installation positions or under other conditions
that require a reduction in the output current (e.g., installation altitude, operation at temperatures about
+60°C, ...).
• Note that leakage current, electromagnetic interference, input inrush current, and harmonics increase
when using multiple power supplies.
Fig. 25: Parallel connection
4.9 Inductive and capacitive loads
The device is designed to supply all load types, including capacitive and inductive loads.
If very large capacitors such as EDLCs (electric double-layer capacitors or "UltraCaps") with a capacitance of
more than 2.5 F are connected to the output, the device charges the capacitor in hiccup mode if necessary
(see
Output [ } 13] chapter).