QUINT-PS-3x400-500AC/24DC/20

100034_04_en

PHOENIX CONTACT

11

Temperature Response

Figure 14

Temperature response

At an ambient operating temperature of up to +40°C, the

an ambient operating temperature of +60°C. The output

power must be decreased by 2.5% per Kelvin temperature

increase for ambient operating temperatures over +60°C.

At ambient operating temperatures above +70°C or in the

event of a thermal overload, the device does not switch off.

The output power is decreased to such an extent that

device protection is provided. Once the device has cooled

down, the output power is increased again.

Parallel Operation

Devices of the same type can be connected in parallel to

increase both redundancy and power. The default setting

does not have to be adjusted.

If the output voltage is adjusted, an even current distribution

can be ensured by precisely setting all power supply units

that are operated in parallel to the same output voltage.

To ensure symmetrical current distribution we recommend

that all cable connections from the power supply unit to the

DIN rail are the same length and have the same cross

section.

Redundancy Operation

Figure 15

Redundancy operation

Redundant circuits are suitable for supplying systems,

which place particularly high demands on operational

safety.

If a fault occurs in the primary circuit of the first power

supply unit, the second device automatically takes over the

entire power supply, without interruption, and vice versa.

For this purpose, the power supply units to be connected in

parallel must be large enough that the total current

requirements of all loads can be fully met by one power

supply unit.

Increasing Power

Figure 16

Increasing power

number of devices connected in parallel.

Parallel connection for increasing power is used when

extending existing systems. A parallel connection is

recommended if the power supply unit does not cover the

current consumption of the most powerful load.

Otherwise, the loads should be divided over independent

individual devices.

© PHOENIX CONTACT 12/2005

A maximum of five devices can be connected

in parallel.

Depending on the system, for parallel

connection of more than two power supply

units a protective circuit should be installed at

each individual device output (e.g., decoupling

diode or DC fuse). This prevents high return

currents in the event of a secondary device

fault.

0

0

40

60

20

I

N

Ambient operating temperature [°C]

External decoupling diodes are required for

100% redundancy

(QUINT-DIODE/40, Order No. 29 38 96 3).

A maximum of five devices can be connected

in parallel.

I

N

+

+

++

-

--

-

Σ = I

N

I

N

I

N

+

+

++

-

--

-

Σ = 2 * I

N

I

N