Technical data

35
©
FuG Elektronik GmbH, D-83135 Schechen, Am Eschengrund 11
http://www.fug-elektronik.de, E-Mail: [e-mail]
V 0913
Linear regulated power supplies unipolar
Series NLN from 6,5 V to 500 V / 35 W to 1400 W
Features:
 Voltage and current setting
with 10-turn potentiometers
with precision scale; the ad-
justing knob can be locked
 Output voltage and output
current are fast programma-
ble
 No output capacitor
 All units are short circuit proof
and allow unlimited operation
with full current in short circuit
condition
 Voltage and current regulation
with automatic and sharp
transition; control mode indi-
cated by LEDs
 4½ digit DVM for voltage and
current (for table-top models)
 Sense terminals for the com-
pensation of voltage drop on
the load lines, for units up to
350V nominal voltage. The
rated voltage always refers to
the output terminals
 Suitable also for inductive and
capacitive loads
 Standard starting current
limitation from 700W nominal
power onwards
Function:
The mains voltage is trans-
formed to the appropriate level
and rectified. The rectified volt-
age charges a bank of capaci-
tors of the intermediate circuit
to a constant voltage, which it is
given via a set of power transis-
tors to the output. The series
transistor defines the final sta-
bility of the output voltage and
the regulation speed.
Optionally a set of power tran-
sistors parallel to the output can
act as a current sink to provide
active pull down ability. The de-
sign of linear regulated power
supplies is optimized for fast
programming speed.
Design:
 For 35W nominal power -
½19" table-top case,
 other models - 19" table-top
case (19" rack adaptors avail-
able)
 Cooling: Convection or built-
in fan with air outlet on the
rear
Output:
 Output isolation:
The output is floating. Operat-
ing voltage with respect to
earth: max. ±500V.
Each of the output terminals
may be connected to earth.
 4mm safety connectors up to
20A on the rear panel. For
higher currents clamps in-
stalled on the rear.
Technical Data:
 Mains connection:
Up to 1400W nominal power:
230V ±10% 47Hz to 63Hz
For 2800W and higher:
400V ±10% 47Hz to 63Hz,
three-phase
 Ambient temperature:
0°C to +40°C
 Power loss:
At nominal load approx. 25%,
during short circuit at nominal
current approx 125% of the
nominal power.
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 from
page 54.)
 Setting range:
from approx. 0,1% to 100%
 Setting resolution:
±1 x 10
-4
 Residual ripple (0 - 10MHz):
<5 x 10
-4
pp + 10mVpp
 Recovery time:
<50µs for load changes from
10% to 100% or from 100% to
10%
 Setting time at nominal load:
<1ms for full range
 Deviation:
For ±10% mains voltage vari-
ation:
<± 2 x 10
-5
For no load / full load:
<2 x 10
-4
Over 8 hours under constant
conditions:
<±2 x 10
-4
Within the temperature range:
<±2 x 10
-4
/K
Possible Options:
 Analog programming (The
positive output has to be
earthed; see also page 44)
 Analog programming, floating
(see page 44)
 DVM with higher resolution
 Computer interfaces - IEEE
488, RS 232, RS 422, Profi-
bus DP, USB, LAN (more on
request) (see page 46)
 Active pull-down control. Par-
allel to the output is a set of
power transistors operating as
a current sink. (see page 48)
 Higher programming speed
More options and special solu-
tions on request. Some options
may involve changes to the
description of the unit - espe-
cially concerning the mechani-
cal design.
Design examples NLN 1400 - 20
20V / 60A