Data Sheet
QS20.241, QS20.241-A1, QS20.241-C1
Q-Series
24V, 20A, SINGLE PHASE INPUT
7. HOLD-UP TIME
AC 100V AC 120V AC 230V
Hold-up Time typ. 64ms 64ms 99ms at 24V, 10A, see Fig. 7-1
typ. 32ms 32ms 51ms at 24V, 20A, see Fig. 7-1
Fig. 7-1 Hold-up time vs. input voltage Fig. 7-2 Shut-down behavior, definitions
10
20
30
40
50
100ms
85 120 155 190 230Vac
Input Voltage
2
4
V
,
2
0
A
,
m
i
n
.
60
70
80
Hold-up
Time
90
2
4
V
,
2
0
A
,
t
y
p
.
2
4
V
,
1
0
A,
m
i
n
.
2
4
V
,
1
0
A
,
t
y
p
.
- 5%
Hold-up Time
Zero Transition
Output
Voltage
Input
Voltage
8. DC-OK RELAY CONTACT
This feature monitors the output voltage, which is produced by the power supply itself. It is independent of a back-fed
voltage from a unit connected in parallel to the power supply output.
Contact closes As soon as the output voltage reaches the adjusted output voltage level.
Contact opens As soon as the output voltage dips more than 10% below the adjusted output voltage.
Short dips will be extended to a signal length of 250ms. Dips shorter than 1ms will be ignored.
Contact re-closes As soon as the output voltage exceeds 90% of the adjusted voltage.
Contact ratings max 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A resistive load
min 1mA at 5Vdc min. permissible load
Isolation voltage See dielectric strength table in section 18.
Fig. 8-1 DC-ok relay contact behavior
250ms
0.9* V
ADJ
<
1ms
10%
open
V
OUT
= V
ADJ
openclosed closed
>
1ms
Note: The DC-ok feature requires that the output voltage reaches the nominal (=adjusted) level after turn-on in order to function according
to specification. If this level cannot be achieved, the overload lamp will be on and the DC-ok contact will be open. The overload signal
will only shut off as soon as the adjusted voltage is reached. This is an important condition to consider particularly, if the load is a
battery, the power supply is used in parallel or the power supply is used for N+1 redundant systems.
Oct. 2013 / Rev. 2.2 DS-QS20.241-EN
All parameters are specified at 24V, 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
8/26