Technical data

38
©
FuG Elektronik GmbH, D-83135 Schechen, Am Eschengrund 11
http://www.fug-elektronik.de, E-Mail: [e-mail]
V 0913
Linear regulated power supplies bipolar
Series NLB from ±6,5 V to ±350 V / 35 W to 1400 W
Features:
 Single output power supply
with adjustable bipolar output
voltage and current. Instanta-
neous change of polarity.
 Voltage and current setting
with 10-turn potentiometers
with precision scale; the ad-
justing knob can be locked
 When equipped with an inter-
face or with the analog pro-
gramming, fast programmable
including change of polarity
 Short circuit proof and allow
unlimited operation with full
current in short circuit condi-
tion
 One of the potentiometers is
used for set point adjustment
(selectable for voltage or
current). The second potenti-
ometer is for limiting the
respective other value.
 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.
 4-quadrant operation is possi-
ble for passive loads (when
the stored energy is low, op-
tionally also for active loads or
higher energy with reverse
current)
 Suitable also for inductive and
capacitive loads
 Standard starting current
limitation from 700W nominal
power onwards
Function:
Bipolar linear regulated power
supplies supply one output volt-
age, where the value and polari-
ty is adjustable. The mains volt-
age is transformed to the appro-
priate level and rectified. The
rectified voltage charges a bank
of capacitors of the intermediate
circuit to a constant voltage,
which it is fed, via a set of serial
power transistors, to the output.
The output stages of the positive
and the negative circuits are
switched together in a push-pull
manner. The regulation transis-
tors define the final stability of
the output voltage and the regu-
lation speed. Bipolar power
supplies are able to operate as
4-quadrant power amplifier.
(optionally also for active loads).
Design:
 19" table-top case (19" rack
adaptors available)
 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.
 Output terminals:
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. 35%,
during short circuit at nominal
current approx 140% and at
no load approx. 15% 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 on
page 54.)
 Setting range:
from -100% to +100%
 Setting resolution:
±2 x 10
-4
 Residual ripple (0 - 10MHz):
<5 x 10
-4
pp + 10mVpp
 Recovery time:
Voltage regulation
<50µs for load changes from
10% to 100% or from 100% to
10%
Current regulation: <1ms
 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 (Output
“A0” on “0V” potential, see
page 44)
 Analog programming, floating
(page 44)
 Computer interfaces - IEEE
488, RS 232, RS 422, Profi-
bus DP, USB, LAN (more on
request) (see page 46)
 Full 4-quadrant operation,
even with active loads
 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 example
NLB 350 - 20
± 20V / ± 15A