Cassette Style
100 Watt AC-DC Converters
S Series PFC
Edition 01/01.2001
21/27
P Potentiometer
The potentiometer provides an output voltage adjustment
range of
+10/
–
60% of U
o nom
and is accessible through a
hole in the front cover. This feature enables compensation
for 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 U
o nom
via R-in-
put control, option P setting, remote sensing or option T, the
output current(s) should be reduced accordingly so that
P
o nom
is not exceeded.
-9 Extended Temperature Range
Option
–
9 extends the operational ambient temperature
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
T
A
=
–
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 U
o 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 U
o1
= 5.1 V
Table 14: Leakage currents
Characteristic
Class I
Unit
LS 4000...LS 5000
Maximum earth
leakage current
Permissible according to IEC/EN 60950
3.5
mA
Specified value at 254 V, 50 Hz
0.82
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.
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
Table 15: Safety concept leading to an SELV output circuit
Conditions
AC-DC converter
Installation
Result
Nominal voltage
Grade of insulation
between input and output
provided by the AC-DC converter
Measures to achieve the resulting
safety status of the output circuit
Safety status of the AC-DC
converter output circuit
Mains
≤
250 V AC
Double or reinforced
Earthed case
1
and installation
according to the applicable standards
SELV circuit
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
Fuse
Fig. 30
Schematic safety concept. Use fuses and earth connec-
tion as per Installation Instructions and table Safety con-
cept leading to an SELV output circuit.