CP20.241-R1, CP20.241-R2,

CP20.241-R3

CP-Series

June 2017 / Rev. 0.1 DS-CP20.241-R2-EN

All parameters are typical values specified at 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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P R E L I M I N A R Y

A voltage adjustment potentiometer can be found behind the flap on the front of the unit (see chapter 15). However,

it is not recommended to change the output voltage since load sharing between power supplies connected in parallel

can only be achieved by a precise setting of the output voltages. The factory settings allow precise load sharing and

only qualified personnel should change the adjustment potentiometer.

Adjustment range

min.

24 - 28V

Please note the “soft output regulation characteristic”

where the voltage at no load is approx. 4% higher

than at nominal load. See chapter 6 for details.

max.

30V

Maximum output voltage which can occur at the

clockwise end position of the potentiometer due to

tolerances. It is not a guaranteed value which can be

achieved. The typical value is about 29.5V.

Output current at 28V

nom.

20.6A

Below +45°C ambient

nom.

17.1A

At +60°C ambient

nom

13.0A

At +70°C ambient

Current values between 24V and 28V can be interpolated.

The output voltage shall only be changed when absolutely necessary, e.g. for battery charging.

This redundancy power supply is ideal for charging batteries due to the decoupling circuit built in to the output stage

which does not require a fuse or diode between the power supply and the battery.

It can be used to charge sealed lead acid (SLA) or valve regulated lead acid (VRLA) lead batteries when following these

instructions:

a)

Set output voltage (measured at disconnected battery) very precisely to the end-of-charge voltage. Use the

potentiometer, which is hidden behind the flap on the front of the unit.

Battery temperature

10°C

20°C

30°C

40°C

End-of-charge voltage

27.8V

27.5V

27.15V

26.8V

b)

Ensure that the ambient temperature of the power supply stays below 40°C.

c)

Use only matched batteries when putting 12V types in series.

d)

The return current to the power supply (battery discharge current) is typically 11mA when the power supply is

switched off.

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.