Application notes
PS3031-4820-0000
38
Version: 1.0
4.6
Charging batteries
The power supply is not recommended for charging lead-acid batteries or maintenance-free batteries (SLA
or VRLA batteries).
The PS3031-4820-0000 power supply cannot provide the recommended end-of-charge voltage of 55.0 V (at
20°C) for four 12 V lead-acid batteries in series.
4.7
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
150 Vdc. Voltages with a potential higher than 60 Vdc are no longer regarded as safety extra-low voltage
and can be dangerous. Such voltages must be protected with a contact hazard protection.
• Grounding of the output is required if the sum of the output voltages is more than 60 Vdc.
• Avoid application of return voltage (e.g., from a braking motor or battery) to the output terminals.
Restrictions:
• Maintain an installation distance of 15 mm (left/right) between two power supplies.
• 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).
• Note that leakage current, electromagnetic interference, input inrush current, and harmonics increase
when using multiple power supplies.
Fig. 27: Series connection
