QS40.481

Q-Series

Output voltage

nom.

DC 48V

Adjustment range

min.

48-54Vdc

guaranteed

max.

at clockwise end position of potentiometer

Factory setting

typ.

48.0Vdc

±0.2%, at full load, cold unit, in “single use” mode

typ.

46.0Vdc

±0.5%, at full load, cold unit, in “parallel use” mode

typ.

48.0Vdc

at no load, cold unit, in “parallel use” mode

Line regulation

max.

10mV

85-300Vac

Load regulation

max.

50mV

in “single use” mode: static value, 0A

20A, see Fig. 6-1

typ.

2000mV

in “parallel use” mode: static value, 0A 20A,

see Fig. 6-2

Ripple and noise voltage

max.

150mVpp

20Hz to 20MHz, 50Ohm

Output current

nom.

20A

continuously available at 48V, see Fig. 6-1 and Fig. 6-2

nom.

17.8A

continuously available at 54V, see Fig. 6-1 and Fig. 6-2

nom.

30A

for typical 4s, see Fig. 6-1 and Fig. 6-2

nom.

26.7A

for typical 4s, see Fig. 6-1 and Fig. 6-2

typ.

55A

up to 10ms, output voltage stays above 40V, see Fig.

6-4, This peak current is available once every second.

See chapter 25.2 for more peak current measurements.

Output power

nom.

960W

continuously available at 48-54V

nom.

typ.

4s

duration until the output voltage dips, see Fig. 6-5

typ.

7s

overload free time to reset power manager, see Fig. 6-6

Overload behavior

cont. current

output voltage > 40Vdc, see Fig. 6-1

output voltage < 40Vdc, see Fig. 6-1

Short-circuit current

min.

load impedance 50mOhm, see Fig. 6-3

max.

load impedance 50mOhm, see Fig. 6-3

max.

11.5A

average (R.M.S.) current, load impedance 50mOhm, see

Fig. 6-3

typ.

62A

up to 10ms, load impedance <10mOhm, see Fig. 6-4

Output capacitance

typ.

3 700μF

included in the power supply

*)

The power supply is designed to support loads with a higher short-term power requirement without damage or shutdown. The short-

Fig. 6-5), the max. output power is automatically reduced to 960W. If the power requirement is continuously above 960W and the

voltage falls below approx. 40V (due to the current regulating mode at overload), the unit shuts-off and makes periodical restart

attempts. This behavior is called hiccup mode which is described below. If the voltage is above 40V, the unit continuously delivers

current.

**)

Up to 4s of overloading, the power supply delivers continuous output current. After this, the output power is reduced to nearly zero

for approx. 17s before a new start attempt is automatically performed. If the overload has been cleared, the device will operate

normally. If the overload still exists, the output current will be delivered for 2 to 4s (depending on the overload) again followed by a

17s rest time. This cycle is repeated as long as the overload exists. See Fig. 6-3. During the off-period a small rest voltage and rest

current is present on the output.

***)

Discharge current of output capacitors is not included.

****)

This is the maximum output voltage which can occur at the clockwise end position of the potentiometer due to tolerances. It is not

guaranteed value which can be achieved. The typical value is about 55V.

Jul. 2015 / Rev. 1.2 DS-QS40.481-EN

All parameters are specified at 48V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

www.pulspower.com Phone +49 89 9278 0

Germany

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