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QT20 Power Supply Instruction Manual
Technical Data
Output Voltage
Factory Set
typ.
Output Current
min
min
Output Power
min.
min.
Output Ripple
max.
Over-voltage Protection
max.
AC Input Voltage
-
AC Input Current
max.
Power Factor
typ.
AC Inrush Current
max.
Efficiency
typ.
Losses
typ.
Hold-up Time
typ.
Capacitive Loads
-
Inductive Loads
-
Limited Warranty
-
Functional Diagram
L1
Input Filter
L2
Input Rectifier
Converter
Inrush Limiter
L3
Transient Filter
Temper-
Output
ature
Power
Shut-
Manager
down
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%
V
ADJ
< 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
Storage temperature
Humidity
Vibration sinusoidal
Shock
Allowed output current versus
the ambient temperature
Ambient temperature is defined
2cm below the unit.
QT20.241
QT20.361
DC 24-28V
DC 36-42V
24.1V
36.0V
20-17.5A
13.3-11.4A
30-26A
20-17.1A
480W
480W
720W
720W
100mVpp
150mVpp
35Vdc
53Vdc
3AC 380-480V
-15/+15%
0.9-0.65A / Phase
0.94
2
4A peak, 1A
s
95.0 / 94.8%
94.8 / 94.6%
25.3 / 26.4W
26.3 / 27.4W
22ms
No limitations
No limitations
3 year
Output
Voltage
Regulator
PFC
Output
Power
Filter
Converter
Output
Output
Over-
Voltage
Voltage
Monitor
DC ok
Protection
Relay
10%
250ms
> 1ms
open
-25 to +70°C
De-rate above +60°C
-40 to +85° C
Storage, transport
5 to 95% RH
No condensation allowed
2g
IEC 60068-2-6
30g 6ms, 20g 11ms
IEC 60068-2-27
150%
for ty p. 4s
125%
100%
continuous
75%
50%
Ambient Temperature
25%
0%
-40°C -20°C 0°C
20°C 40°C 60°C 80°C
QT20.481
DC 48-55V
externally adjustable
48.0V
at full rated load
10-8.7A
continuous
15-13A
for typ. 4 sec
480W
continuous
720W
for typ. 4 sec
100mVpp
BW DC to 20MHz
60Vdc
, 50-60Hz
TN, TT and IT mains
at 3x 380 - 480Vac
at 3x 380 - 480Vac
at 3x 380 - 480Vac
95.4 / 95.0%
at 3x 400 / 480Vac
23.1 / 25.3W
at 3x 400 / 480Vac
at 3x 380 - 480Vac
Dielectric Strength
Input
L1
V
OUT
L2
+
L3
+
A
-
-
Earth
Over-
load
DC
ok
DC
ok
Overload Performance
28V
24V
20V
16V
12V
8V
4V
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
OUT
closed
max.
150%
100%
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.
B
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.
C
+
The output voltage is floating and has no ohmic
-
reference to ground.
A
Type Test
60s
2500Vac
Factory Test
5s
2500Vac
Field Test
5s
2000Vac
The unit is designed to support loads with a higher short-term
power requirement without damage or shutdown.
5 s
4 s
3 s
continuous
for 4s
2 s
1 s
Output Current
0 s
Bonus time
Duration until the output starts dipping.
Bonus Time is hardware controlled.
P
T
T
PEAK
PEAK
0
P
0
Overload, no-load, short-circuit proof
IP 20
I
2
yes
yes
III
>3.5mm
yes
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).
B
C
D
3000Vac
500Vac
500Vac
2500Vac
500Vac
500Vac
2000Vac
500Vac
500Vac
max.
min.
Output Current
110% 120% 130% 140% 150% 160%
Examples for pulse load
compatibility:
P
P
T
T
PEAK
0
PEAK
0
720W
480W
1s
>25s
720W
0W
1s
>1.3s
720W
240W
0.1s
>0.16s
720W
240W
1s
>1.6s
t
720W
240W
3s
>4.9s
t
EN/IEC 60529
PE (Ground) connection required!
EN 50178, not conductive
Output shut-down with automatic restart
Output shut-down with automatic restart
EN 50178
e.g. screws, small parts ...
Device also operates with two phases
See specification on next page.
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