The PSU-UNI2450U power supply has the following hardware control features:

Power switch

An output adjustment selector switch (25 V DC or 28 V DC)

An alarm contact

Power switch

The power switch is sunk into the frame to prevent accidental operation. It allows you to switch off the PSU-UNI2450U before you disconnect it.

With the power switched off you can safely remove the AC and DC power cables without risk of sparks or spikes on the grid.

Output adjustment selector switch

To adjust the output to 28 V DC (e.g. for UPS applications), all four dip-switches in the PSU front need to be set in their left position, as shown in the below figure.

Default factory setting of the dip-switch is 25 V DC.

Alarm contact

The PSU-UNI2450U has an alarm contact used for voltage monitoring.

The below figure shows the alarm contact with the relay energized, which means that the PSU is powered and the output voltage is above 22Vdc, and fan reached required speed.

Installation

The unit can be mounted both vertically or horizontally.

Convection cooling works best when the unit is mounted vertically, with the power and fan input facing downwards (see the below figure).

The below figure shows that:

The maximum PSU ambient temperature may not exceed 50°C (122°F) when operating at full load.

When mounting vertically the maximum PSU ambient temperature may go up to 70°C (158°F) when operating at half load or less.

Electrical connections

The following connection details apply to the power supply:

The AC input uses a IEC60320 C20 inlet socket type with a retaining clip to hold the IEC60320 C19 power connector. A cable is included to connect the PSU to the mains.

The DC output uses 2 internally mounted male output connectors, type Phoenix PCV6-16/2-G1F10,16 with locking nuts. A dual cable set is included to transfer the load to the main power rail. For more information see MB-0001.

The external alarm wires are mounted to a 3 pole female screw socket, make Phoenix, type MC 1,5/3-G-3,81. This connector is plugged into a male connector next to the power connectors.

The below figure shows the connections and connector lay-out on the output side of the PSU-UNI2450U.

The below table shows the recommended wire sizes for the power supply’s input and output wiring.

48 V DC Power supply (1200 W) – UL508 approved

The PSU-UNI4825U power supply is a UL approved switched-mode DC power supply with a high efficiency (>85% at 187 V AC and >80% at 93, 5 V AC). It accepts a wide range of input voltages to provide 48 V DC and 25 A output.

Main features

The units main features include:

Dual built-in over-voltage protection, to comply with the functional safety requirements of the DIN V 19250 and VDE V 0801 standards.

ON/OFF switch on the power supply combined with isolated AC and DC power connectors enable on-line replacement of the unit in a live system.

A current limit feature, used to limit the maximum output power to 1200 W.

DC under-voltage alarm (<44 V).

An output diode for parallel operation.

Optimum protection against continuous overload and short-circuiting.

100 ms holdup time.

Hardware control features

The PSU-UNI4825U power supply has the following hardware control features:

Power switch

An alarm contact.

Each of these features is discussed in more detail below.

Power switch

The power switch is sunk into the frame to prevent accidental operation. It allows you to switch off the PSU-UNI4825U before you disconnect it.

With the power switched off you can safely remove the AC and DC power cables without risk of sparks or spikes on the grid. |

Alarm contact

The PSU-UNI4825U has an alarm contact used for voltage monitoring.

The below figure shows the alarm contact with the relay energized, which means that the PSU is powered and the output voltage is above 44Vdc.

Installation

The unit can be mounted both vertically or horizontally.

Convection cooling works best when the unit is mounted vertically, with the power and fan input facing downwards (see the below figure).

The below figure shows that:

The maximum PSU ambient temperature may not exceed 50°C (122°F) when operating at full load.

When mounting vertically the maximum PSU ambient temperature may go up to 70°C (158°F) when operating at half load or less.
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