CT10.481

C-Series

Daisy chaining (jumping from one power supply output to the next) is allowed as long as the average output current

through one terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal block.

Fig. 23-8 Daisy chaining of outputs

Fig. 23-9 Using distribution terminals

Power

Supply

+ +

- -

Input

Output

Load

+

-

max 25A!

Power

Supply

+ +

- -

Input

Output

Load

+

-

Distribution

Terminals

Power

Supply

+ +

- -

Input

Output

Power

Supply

+ +

- -

Input

Output

Unit B

-

+

Load

+

-

AC

DC

AC

DC

-

+

Unit A

Earth

(see notes)

Power supplies of the same type can be connected in series for higher output

voltages. It is possible to connect as many units in series as needed, providing

the sum of the output voltage does not exceed 150Vdc. Voltages with a

potential above 60Vdc are not SELV any more and can be dangerous. Such

voltages must be installed with a protection against touching. Earthing of the

output is required when the sum of the output voltage is above 60Vdc. Avoid

return voltage (e.g. from a decelerating motor or battery) which is applied to

the output terminals. Keep an installation clearance of 15mm (left / right)

between two power supplies and avoid installing the power supplies on top of

each other. Pay attention that leakage current, EMI, inrush current, harmonics

will increase when using multiple power supplies.

When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher

than outside. In such situations, the inside temperature defines the ambient temperature for the power supply.

The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.

The power supply is placed in the middle of the box, no other heat producing items are inside the box

Enclosure:

Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm

Load:

48V, 4A; (=80%) load is placed outside the box

Input:

3x 400Vac

Temperature inside enclosure:

48.9°C (in the middle of the right side of the power supply with a distance of 2cm)

Temperature outside enclosure: 24.7°C

Temperature rise:

24.2K

Jan. 2010 / Rev. 1.1 DS-CT10.481-EN

All parameters are specified at 48V, 5A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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