2 - Redundancy unit CP-C.1-A-RU | Data sheet

Functions

1 INPUT 1, 2:

Terminals – input

2 Circuit diagram

3 OUTPUT +/-, +/ –:

Terminals – output

Application

The redundancy unit CP-C.1-A-RU provides decoupling of

two CP-C.1-A-RU power supply units. It provides automatic

redundant power supply operation for critical applications.

It has 2 inputs, each up to 20 A, and 1 output up to 40 A.

Operating mode

True redundancy with decoupling provided by the

CP-C.1-A-RU

Redundant circuits are used to increase the operational

reliability and eliminate power supply outages. Events that

can cause a power supply failure include: incorrect wiring,

blown fuses, or failure of a single power supply. If a fault event

occurs (called initial fault) in the first power supply circuit,

power to all loads is then supplied by the second (redundant)

power supply. For this reason, both power supplies must be

sized to handle the total current requirement of all loads.

The primary and the redundant power supplies are decoupled

from one another by the CP-C.1-A-RU unit.

It automatically switches from the primary to the redundant

supply after a fault. It decouples the output of the failed power

supply from the redundant supply preventing the initial fault from

shorting or compromising the redundant supplies’ output. In this

way, uninterrupted supply of power to all loads is guaranteed.

When available, the two power supplies should be connected to

different input voltage phases, to avoid loss of power caused by a

blown fuse on the primary side of the power supplies.

True redundancy, Iout ≤ Ir

3

2

1

Functions, application, operating mode

Parallel operation for increased power

Another operation mode of two power supplies in combination

with a redundancy unit is to parallel and decouple them for

increased power. The setup looks similar to the true redundant

installation above but the field of application is different.

Instead of redundancy the max. output current (limits see

under the schematics) can be used to power up the loads.

The redundancy module decouples both power supplies

from each other to avoid that any electrical failure from one

power supply circuit affects the other one. However, using the

increased power also means there is no redundancy since if

one supply fails the other one can not supply the load alone.

Increased power, Iout ≥ Ir

CP-C.1

Ir

20 A

CP-C.1

Ir

20 A

L+

L+

L-

L-

CP-C.1-A-RU

INPUT 1INPUT 2

++

-

-

OUTPUT

+-

+-

LN PE

LN PE

L1

L2

L3

N

PE

Load Iout

Ir

Ta

60 °C - max. 20

A

Ta

40 °C - max. 30

A

CP-C.1

Ir

20 A

CP-C.1

Ir

20 A

L+

L+

L-

L-

CP-C.1-A-RU

INPUT 1INPUT 2

++

-

-

OUTPUT

+-

+-

LN PE

LN PE

L1

L2

L3

N

PE

Load Iout

Ir

Ta

60 °C - max. 40

A

Ta

40 °C - max. 60

A