Technical data

55
©
FuG Elektronik GmbH, D-83135 Schechen, Am Eschengrund 11
http://www.fug-elektronik.de, E-Mail: [e-mail]
V 0913
Nominal voltage
Maximum adjustable voltage.
For FuG- power supplies the
second number in the type
name is usually the nominal
voltage of the power supply.
Operational conditions
As far as not otherwise stated in
the manual, for Fug power sup-
plies the following conditions
are valid:
Temperature: 0 to +40 °C
Humidity: 0 to 85% not
condensing
Height over sea level:
max. 2000m
Output isolation
On units where the "0V" termi-
nal is not firmly connected to
earth (or may be optionally
disconnected from earth), it is
always shown up to which maxi-
mum voltage the terminal may
be allowed to float with respect
to earth.
For units with floating output (all
low and medium voltage power
supplies up to 2kV - except
cassettes) this value is valid for
either of the output terminals.
PROBUS
FuG name for our system of
computer interfaces.
PWM-Regulator
Regulator utilising Pulse Width
Modulation. Such regulators are
used in switch mode power
supplies and in drives.
Quench
The transition of a super con-
ducting coil / magnet from super
conducting to normally conduct-
ing condition. If no special
measures are taken, the ener-
gy, stored in the magnetic field,
will be converted into thermal
energy, within a short time,
when quench occurs.
Quench detector
Circuit to detect a quench.
Recovery time
This characteristic is stated
independently for voltage and
current:
For voltage control, it is the
time which the power supply
requires to return to the adjust-
ed voltage after a load variation
from 10% to 100%, or from
100% to 10%.
For current control, it is the
time which the power supply
requires to return to the adjust-
ed current after a load variation
where the output voltage does
not change by more than 10%
of the nominal voltage.
Regulation mode
Standard power supplies can
be operated in constant voltage
mode or constant current
mode. Switching over takes
place automatically with sharp
transition. For FuG power sup-
plies the regulation mode is
displayed on the front plate by
LEDs.
Regulations and standards
The design and production of
our power supplies is in accord-
ance with the latest standards
for EMC and safety. Depending
on the type of the respective
unit, different standards are
valid:
EMC:
EN61000-6-1 and EN61000-6-3
(single-phase mains connec-
tion)
EN61000-6-2 and EN61000-6-4
(two- and three-phase mains
connection)
Safety:
EN 61010
Repetition frequency
This frequency corresponds to
the repetitive charge and dis-
charge of a capacitor by a ca-
pacitor charging power supply.
The reproducibility of the end-of
-charge voltage depends on the
repetition frequency.
Reproducibility
Repeatability of setting of a
desired output value under
constant conditions - it is al-
ways referred to the nominal
value of the supply.
Residual Ripple
If not otherwise stated the resid-
ual voltage ripple is the referred-
to parameter. It is always re-
ferred to the nominal value inde-
pendent of the set value. The
frequency of the ripple is the
frequency of the mains rectifier
and its harmonics. For chopper
controlled units there is also a
component of the switching
frequency (usually 20kHz/40
kHz). For capacitor charging
power supplies the value of the
charging current is the referred-
to parameter.
For FuG- power supplies the
residual ripple usually is stated
as “Peak to peak”. (“p-p”) value.
It is different to the “RMS” value
since this measurement also
takes into account the short
term voltage peaks on full scale.
RMS
The energetically equivalent DC
value (also effective value) to an
alternating voltage. It corre-
sponds to the square root of the
integral of squares (Root Mean
Square). For a purely sinusoidal
voltage the rms value corre-
sponds to about 36% (1/(2x√2))
of the "peak-to-peak" value. At a
pulse range consisting of narrow
peaks (which is typically the
case for the residual ripple of a
switched mode power supply)
the difference can be considera-
bly larger.
Safety
See Regulations and Standards.
Sense terminals
For low voltage power supplies,
sense lines can be connected to
these terminals to measure the
voltage immediately at the load
and by this to compensate for
any voltage drop on the load-
lines. The nominal output volt-
age always refers to the actual
output terminals and does not
take account of any voltage
drop on the load-lines. The com-
pensation of the voltage drop on
the load-lines is restricted to a
maximum of 5% of the nominal
voltage (minimum of 1V) and
has to be considered when
choosing a supply.
Setting resolution
Smallest possible steps for the
adjustment of voltage or current
- always referred to the nominal
value.
Setting time
The time required before the
output value of a power supply
reaches the set value in the
limits of the stated tolerance.
Stability
See deviation.
Standards
See Regulations and Stand-
ards.
Switch mode power supply
Power supply where the trans-
mission of energy is performed
by high frequently alternating
voltage.
Temperature coefficient (Tc)
In addition to the value for long-
term stability (see deviation), we
also refer to the 'drift' of an
output value as a function of the
variation in the ambient temper-
ature whilst the supply is oper-
ating under otherwise constant
conditions. The data is specified
as 'per Kelvin' and is only valid
within the stated operating tem-
perature range. The Tc is al-
ways referred to the nominal
value. When the option "higher
stability" is integrated, then the
Tc figure improves.
Thyristor regulation
Control of energy flow by a
phase cutting circuit with thyris-
tors, operating at the frequency
of the mains input.
Unipolar power supply
Units with only one polarity and
with no regulation through zero.
Warm-up time
Stability data is only valid after a
warm-up time of min. 30
minutes.
2-quadrant operation
The unit operates as a current
source and also as current sink
(electronic load) with only one
polarity of the output voltage.
(See active pull-down.)
4-quadrant operation
The unit operates as a current
source and also as current sink
(electronic load) with both polar-
ities of the output voltage. (See
also bipolar power supply.)
Definitions and Terms