CS5.244

C-Line

Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called

return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).

This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply.

It does not matter whether the power supply is on or off.

The maximum allowed feed-back-voltage is 35Vdc. The absorbing energy can be calculated according to the built-in

large sized output capacitor which is specified in chapter 6.

The unit is tested and approved for branch circuits up to 20A. An external protection is only required if the supplying

branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local

regulations might apply.

If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of

the circuit breaker. A minimum value of 16A B- or 10A C-Characteristic breaker should be used.

The power supply shall not be used in parallel to increase the output current.

Power supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a

certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two

power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one is

automatically able to support the load current without any interruption, see also chapter 22.4.

Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit in

the secondary side of the power supply. In such a case, the defective unit becomes a load for the other power supplies

and the output voltage can no longer be maintained. This can be avoided by utilizing redundancy modules, which

have decoupling devices (diodes or MOSFETs) included. Further information and wiring configurations can be found in

chapter 21.3.

Recommendations for building redundant power systems:

a)

Use separate input fuses for each power supply.

b)

Monitor the individual power supply units.

Therefore, use the DC-OK relay contact of the YRM2.DIODE.

c)

It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.

Jul. 2015 / Rev. 2.0 DS-CS5.244-EN

All parameters are specified at 24V, 5A, 230Vac, 50Hz, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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