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QT20 Power Supply Instruction Manual
Technical Data
QT20.241
Output Voltage
DC 24-28V
Factory Set
typ.
24.1V
Output Current
min
20-17.5A
min
30-26A
Output Power
min.
480W
min.
720W
Output Ripple
max.
100mVpp
Over-voltage Protection
max.
35Vdc
AC Input Voltage
-
AC Input Current
max.
Power Factor
typ.
AC Inrush Current
max.
Efficiency
typ.
95.0 / 94.8%
Losses
typ.
25.3 / 26.4W
Hold-up Time
typ.
Capacitive Loads
-
Inductive Loads
-
Limited Warranty
-
Functional Diagram
L1
Input Filter
L2
Input Rectifier
PFC
Converter
Inrush Limiter
L3
Transient Filter
Temper-
Output
ature
Power
Shut-
Voltage
Manager
down
Protection
DC-ok Relay Contact
This feature monitors the output voltage, which is produced by the power supply, and is
independent of a return voltage from a unit which is connected in parallel.
Contact closes as soon as the output voltage reaches the nominal value.
Contact opens as soon as the output voltage dips more than 10%.
Short dips will be extended to a length of 250ms on the relay.
Dips shorter than 1ms will be ignored.
Contact ratings 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A, resistive load
V
V
ADJ
OUT
90%
10%
V
ADJ
< 1ms
> 1ms
closed
open
Please note:
The DC-ok feature requires that the output voltage reach the nominal (=adjusted) level after
turn-on in order to function to specification. If this level cannot be achieved, the unit will show
an overload condition. The overload signal will disappear as soon as the adjusted voltage is
reached. This is an important to condition to consider particularly, if the load is a battery or
the power supply is used for N+1 redundant systems.
Environment
Operational temperature
-25 to +70°C
Storage temperature
-40 to +85° C
Humidity
5 to 95% RH
Vibration sinusoidal
2g
Shock
30g 6ms, 20g 11ms
150%
125%
Allowed output current versus
100%
the ambient temperature
75%
50%
Ambient temperature is defined
25%
2cm below the unit.
All manuals and user guides at all-guides.com
QT20.361
QT20.481
DC 36-42V
DC 48-55V
36.0V
48.0V
13.3-11.4A
10-8.7A
20-17.1A
15-13A
480W
480W
720W
720W
150mVpp
100mVpp
53Vdc
60Vdc
3AC 380-480V
, 50-60Hz
-15/+15%
0.9-0.65A / Phase
0.94
2
4A peak, 1A
s
94.8 / 94.6%
95.4 / 95.0%
26.3 / 27.4W
23.1 / 25.3W
22ms
No limitations
No limitations
3 year
Output
Voltage
Regulator
Output
Power
Filter
Converter
Output
Output
Over-
Voltage
Monitor
DC ok
Relay
250ms
closed
open
De-rate above +60°C
Storage, transport
No condensation allowed
IEC 60068-2-6
IEC 60068-2-27
for ty p. 4s
continuous
Ambient Temperature
0%
-40°C -20°C 0°C
20°C 40°C 60°C 80°C
externally adjustable
at full rated load
continuous
for typ. 4 sec
continuous
for typ. 4 sec
BW DC to 20MHz
TN, TT and IT mains
at 3x 380 - 480Vac
at 3x 380 - 480Vac
at 3x 380 - 480Vac
at 3x 400 / 480Vac
at 3x 400 / 480Vac
at 3x 380 - 480Vac
Dielectric Strength
Input
L1
B
V
L2
OUT
+
L3
+
A
-
-
Earth
C
Over-
load
DC
ok
Type Test
DC
Factory Test
ok
Field Test
Overload Performance
28V
24V
20V
16V
continuous
12V
8V
4V
Output Current
0V
0A 5A 10A 15A 20A 25A 30A 35A
Output characteristic (typ.)
Curve is valid for the 24V unit. Units with output
voltages other than 24V have an equivalent and
proportional performance.
Repetitive pulse loading: Multiple pulses can be supported as long as the average (R.M.S.)
output current stays below the specified continuous output current.
P
P
T
OUT
PEAK
PEAK
max.
150%
100%
P
0
0%
Protection
Output
Degree of protection
Class of protection
Degree of pollution
Over-temperature protection
Output over-voltage protection
Over-voltage category
Penetration protection
Phase failures or missing phases
Internal input fuse
External protection
Type tests and factory tests:
DC-ok
Conducted by the manufacturer.
Do not repeat test in field!
Field test rules:
(1) Use appropriate test equipment which
apply the voltage with a slow ramp!
D
(2) Connect L1, L2 and L3 together as well as all
output poles.
Output
(3) Use only AC test-voltages with 50/60Hz.
+
The output voltage is floating and has no ohmic
-
reference to ground.
A
B
60s
2500Vac
3000Vac
500Vac
5s
2500Vac
2500Vac
500Vac
5s
2000Vac
2000Vac
500Vac
The unit is designed to support loads with a higher short-term
power requirement without damage or shutdown.
5 s
4 s
3 s
min.
for 4s
2 s
1 s
Output Current
0 s
110% 120% 130% 140% 150% 160%
Bonus time
Duration until the output starts dipping.
Bonus Time is hardware controlled.
Examples for pulse load
T
0
compatibility:
P
P
PEAK
0
720W
480W
720W
0W
720W
240W
720W
240W
t
720W
240W
t
Overload, no-load, short-circuit proof
IP 20
EN/IEC 60529
I
PE (Ground) connection required!
2
EN 50178, not conductive
yes
Output shut-down with automatic restart
yes
Output shut-down with automatic restart
III
EN 50178
>3.5mm
e.g. screws, small parts ...
yes
Device also operates with two phases
See specification on next page.
Not included
External branch circuit protection is required to protect
the device. Use three thermo-magnetic circuit breakers
with a value between 3A and 16A. Choose tripping
characteristic B (US: F) or C (US: G).
C
D
500Vac
500Vac
500Vac
max.
T
T
PEAK
0
1s
>25s
1s
>1.3s
0.1s
>0.16s
1s
>1.6s
3s
>4.9s
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