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Cassette Style
100 Watt AC-DC (DC-DC) Converters
S Series
Edition 01/01.2001
19/25
P Potentiometer
The potentiometer provides an output voltage adjustment
range of +10/–60% of
Uo nom and is accessible through a
hole in the front cover. This feature enables compensation
of voltage drops across the connector and wiring. Option P
is not recommended if units are connected in parallel.
Option P excludes the R-function. With double output units
both outputs are affected by the potentiometer setting (dou-
bling the voltage setting if the outputs are in series).
If the output voltages are increased above
Uo nom via R-in-
put control, option P setting, remote sensing or option T, the
output current(s) should be reduced accordingly so that
Po nom is not exceeded.
–9 Extended Temperature Range
range from -25...71
°C (standard to –40...71°C. The power
supplies provide full nominal output power with convection
cooling. Option –9 excludes inrush current limitation by
NTC.
Description of Options
Table 16: Survey of options
Option
Function of option
Characteristic
–9
Extended operational ambient temperature range
TA = –40...71°C
E
Electronic inrush current limitation circuitry
Active inrush current limitation
P 1
Potentiometer for fine adjustment of output voltage
Adjustment range +10/–60% of
Uo nom, excludes R input
D 2
Input and/or output undervoltage monitoring circuitry
Safe data signal output (D0...DD)
V 2 3
Input and/or output undervoltage monitoring circuitry
ACFAIL signal according to VME specifications (V0, V2, V3)
T
Current sharing
Interconnect T-pins if paralleling outputs (5 units max.)
B1/B2
Cooling plate
Replaces standard heat sink, allowing direct chassis-mounting
1 Function R excludes option P and vice versa
2 Option D excludes option V and vice versa
3 Only available if main output voltage Uo1 = 5.1 V
Safety of operator accessible output circuit
If the output circuit of an AC-DC converter is operator ac-
cessible, it shall be an SELV circuit according to the IEC/EN
60950 related safety standards.
The following table shows a possible installation configura-
tion, compliance with which causes the output circuit of an
S series AC-DC converter to be an SELV circuit according
to IEC/EN 60950 up to a configured output voltage (sum of
nominal voltages if in series or +/– configuration) of 36 V.
Table 15: Safety concept leading to an SELV output circuit
Conditions
AC-DC converter
Installation
Result
Nominal voltage
Grade of insulation
Measures to achieve the resulting
Safety status of the AC-DC
between input and output
safety status of the output circuit
converter output circuit
provided by the AC-DC converter
Mains
Double or reinforced
Earthed case 1 and installation
SELV circuit
≤250 V AC
according to the applicable standards
1 The earth connection has to be provided by the installer according to the relevant safety standards, e.g. IEC/EN 60950.
AC-DC
con-
verter
Mains
SELV
Earth connection
+
–
~
10021
Fuse
Fig. 26
Schematic safety concept. Use fuses and earth connec-
tion as per Installation Instructions and table Safety con-
cept leading to an SELV output circuit.
However, it is the sole responsibility of the installer to as-
sure the compliance with the relevant and applicable safety
regulations. More information is given in:
Technical Infor-
mation: Safety.
If the S series AC-DC converters are used as DC-DC con-
verters, please refer to the data sheet:
DC-DC Converters
100 Watt: S series.