Application notes
PS2031-2410-0000
31
Version: 1.0
4.3
Charging batteries
The power supply can be used to charge lead-acid batteries or maintenance-free batteries (SLA or VRLA
batteries). Two 12V batteries connected in series are required.
Instructions for charging batteries:
• Make sure that the ambient temperature of the power supply remains below 45°C.
• Adjust the output voltage, measured at no load and at the battery end of the cable, very precisely to the
end-of-charge voltage.
End-of-charge voltage
27.8V
27.5V
27.15V
26.8V
Battery temperature
10°C
20°C
30°C
40°C
• Use a 16A protective circuit breaker or a decoupling diode between the power supply and the battery.
• Make sure that the output current of the power supply is below the permissible charging current of the
battery.
• Only use matched batteries when connecting 12V types in series.
• The reverse current to the power supply is typically 8mA. This reverse current can discharge the
battery when the power supply is switched off, unless a decoupling diode is used.
4.4
Series connection
Power supplies of the same type can be connected in series to increase the output voltages. As many
devices can be connected in series as necessary, as long as the sum of the output voltages does not exceed
150Vdc. Voltages with a potential higher than 60Vdc are no longer regarded as safety extra-low voltage and
can be dangerous. Such voltages must be protected with a touch guard.
Avoid application of return voltage (e.g. from a braking motor or battery) to the output terminals.
Restrictions: Keep a mounting distance of 15mm (left/right) between two power supplies and do not install
the power supplies above each other. Power supplies connected in series should only be used in the
standard installation position (terminals on the underside of the device).
Remember that leakage current, electromagnetic interference, inrush current and harmonics increase when
using multiple power supplies.
Fig. 17: Series connection
4.5
Parallel use to increase power
PS2031-2410-0000 power supplies can be connected in parallel to increase the output power. The output
voltage of all power supplies must be set to the same value (±100mV) in "Single Use" mode and with the
same load conditions on all devices, or the factory settings of the devices can be retained. After making
adjustments, set the unit to "Parallel Use" mode to achieve load sharing. "Parallel Use" mode regulates the
output voltage so that the voltage at no load is approx. 4% higher than at nominal load. See also
