PIRD20.241

PIANO-Series

Using only one input instead of both is allowed up to a nominal input current of 20A at max. +55°C ambient

temperature.

However, it is always recommended to connect both input path in parallel for reduced power losses and voltage drop.

In cases when this is not possible, the following values can be expected:

Voltage drop, input to output

typ.

585mV

at 1x10A, 25°C, see Fig. 17-1

typ.

645mV

at 1x20A, 25°C, see Fig. 17-1

Power losses

0W

at 0A, 25°C

typ.

5.85W

at 10A, 25°C

typ.

12.9W

at 20A, 25°C

Fig. 17-1 Input to output voltage drop

when only one input is used

Fig. 17-2 Test setup for voltage drop measurements

V

A

PIC480.241

24V, 20A

+

-

Voltage Drop

=

-

Output

A

V

Variable

Load,

0-20A

PIRD20.241

Input 1

Input 2

Output

Input 2

must not

used

Voltage Drop, typ.

200mV

300mV

400mV

500mV

600mV

700mV

5A

15A

20A

10A

0

Input, Output Current

A... 25°C

B... 60°C

A

B

Recommendations for the configuration of redundant power systems:

-

Use three-phase power supplies to gain functional safety if one phase fails.

-

When single-phase power supplies are utilized connect them to different phases or mains circuits if possible.

-

Use separate input fuses for each power supply.

-

Set the power supply in “Parallel-Use” mode if this feature is available

-

It is desirable to set the output voltages of all power supplies to the same value.

Sep. 2016 / Rev. 1.0 DS-PIRD20.241

All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted

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Germany

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