Technical data

12
©
FuG Elektronik GmbH, D-83135 Schechen, Am Eschengrund 11
http://www.fug-elektronik.de, E-Mail: [e-mail]
V 0913
Autoranging power supplies
Series NCA / MCA from 55 V to 3000 V / 750 W to 9000 W
Features:
 Auto ranging characteristic
with constant power limitation
 5 power classes and 6 Volt-
age classes: 55V to 3000V
 Up to 1500V with floating
output
 Compact size (19" case) ,
Light-weight and High effi-
ciency
 Short-circuit & flashover proof
 Unlimited operation with nom-
inal power (even in short-
circuit conditions)
 Voltage and current regulation
with automatic, sharp transi-
tion and additional power
limitation
 Control mode indicated by
LED
 4½ digit DVM for voltage and
current for all power classes
 Voltage and current setting
with10-turn potentiometers
with precision scale; the ad-
justing knob can be locked
 Indication of set point values
by means of button for switch-
over of the displays
 Set point adjustment possible
with locked output, release of
output voltage by means of an
"ON" / "OFF" switch
 Suitable also for capacitive
loads
 Sense connections to com-
pensate voltage drop at the
load cables for NCA
 Active down control for NCA
Function:
The NCA/MCA series is an auto
ranging power supply design in
which the power supplies oper-
ate over the full range of their
output voltage & current - up to
the units maximum rated output
power. This results in an operat-
ing range which is up to 3-times
wider than that of a more con-
ventional power supply. When
fitted with the optional computer
interface, the MCA/NCA series
become versatile programmable
power supplies. In principle, the
rectified line voltage drives a
square wave generator, whose
AC voltage is transformed, recti-
fied and filtered, producing the
output voltage. For regulation,
the square wave voltage is
pulse width modulated.
Design:
19" table-top case (19" rack
adapters available)
Output:
 Output isolation:
Up to 1500V nominal voltage
and 3000W power, the output
is floating. Either the positive
or the negative pole may be
connected to earth.
(Not valid with the option ana-
log programming. If the float-
ing function should remain,
the floating analog program-
ming must be chosen).
Maximum isolation voltage:
Up to 400V nominal voltage:
±500V.
At 750V nominal voltage:
±1000V.
At 1500V nominal voltage:
±2000V.
At 3000V nominal voltage
and for 1500V in the power
classes 6000W and 9000W
one pole is earthed, the po-
larity must be indicated when
ordering.
 Output terminals:
Units up to 750V nominal
voltage have 4mm safety
connectors. For units with
output current >10A have
output clamps. For units with
nominal voltage greater than
1500V and rated current up
to 10A SHV connectors are
provided, suitable HV-cable
connectors are included.
.
Technical Data:
 Mains connection:
Up to 1500W nominal power:
230V ±10% 47Hz to 63Hz;
For nominal power 3000W
and higher:
400V ±10% 47Hz to 63Hz;
three-phase
 Ambient temperature:
0°C to +40°C
The following data applies for
voltage and current regulation,
and refers to the rated value
(unless otherwise stated):
(For explanations please refer
to Definitions and Terms on
page 54.)
 Setting range:
from approx. 0,1% to 100%
 Setting resolution:
±1 x 10
-4
 Residual ripple (0 - 10MHz):
<2 x 10
-4
pp + 200mVpp
 Recovery time:
Voltage control:
<1ms for load changes from
10% to 100% or from 100% to
10%.
Current control:
<10ms for load changes
causing an output change of
less than 10% of the rated
voltage
 Setting time at nominal load:
<300ms for changes of the
output voltage from 10% to
90% or 90% to 10%
 Discharge time constant for
output without load:
approx. 10sec for MCA
NCA have active down regu-
lation.
 Deviation:
For ±10% mains voltage vari-
ation:
± 1 x 10
-5
For no load / full load:
<5 x 10
-4
Over 8 hours under constant
conditions:
<±2 x 10
-4
Within the temperature range:
<±1 x 10
-4
/K
MCA 9000 - 1500
1500V / 18A, max. 9000W
Design Example