Application notes
PS1011-2410-000028 Version: 1.0
4.3 External input protection
The device is tested and approved for circuits that are fused up to 30A (UL) and 32A (IEC). External
protection is only required if the supply line has a protection that is higher than this.
Also check the local regulations and requirements. Local regulations may apply in some countries.
If an external fuse is required or used, minimum requirements must be taken into account to avoid false
tripping of the circuit breaker. A circuit breaker with a minimum value of 10A with B characteristic or 6A with
C characteristic should be used.
4.4 Parallel use to increase power
Do not connect devices for higher output currents in parallel.
4.5 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 above 60Vdc are no longer defined as safety extra-low voltage (SELV)
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 voltage exceeds 60Vdc.
Avoid application of return voltage (e.g., from a braking motor or battery) to the output terminals.
Keep an mounting distance of 15 mm (left / right) between two power supplies and avoid installing the power
supplies on top of each other.
Remember that leakage current, electromagnetic interference, input inrush current and harmonics increase
when using multiple power supplies.
Fig.15: Series connection
4.6 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
2.0F are connected to the output, the device charges the capacitor in hiccup mode if necessary (see Output
[}13] chapter).
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