Datasheet
QT20.241, QT20.241-C1
Q-Series
24V, 20A, THREE PHASE INPUT
Oct. 2006 / Rev. 1.0 DS-QT20.241-EN
All parameters are specified at 24V, 20A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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7/23
9. HOLD-UP TIME
3AC 400V 3AC 480V
Hold-up Time typ. 22ms 22ms 20A, 24V, see
Fig. 9-1
typ. 44ms 44ms 10A, 24V, see Fig. 9-1
Fig. 9-1 Hold-up time vs. input voltage Fig. 9-2 Shut-down behavior, definitions
0
10
20
30
40
50ms
320 360 400 440 3x480Vac
Input Voltage
Hold-up Time
2
4
V,
1
0
A
,
t
y
p
.
2
4
V
,
2
0
A
,
t
y
p
.
2
4
V,
1
0
A
,
m
i
n
.
2
4
V
,
2
0
A
,
m
i
n
.
- 5%
Hold-up Time
Zero Transition
Output
Voltage
Intput
Voltage
10. 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 which is connected in parallel to the power supply output.
Contact closes As soon as the output voltage reaches the adjusted output voltage.
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 20
Fig. 10-1 DC-ok relay contact behavior
250ms
90%
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.