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T Series Data Sheet
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Table 21: Leakage currents
500 Watt AC-DC Converters
Characteristic
LT/UT
Unit
Earth leakage
Permissible according to IEC/EN 60950
3.5
mA
current
Specified value at 255 V, 50 Hz (LT)
1.8
1
Specified value at 127 V, 60 Hz (LT or UT)
1.1 1
Output leakage
current
Permissible according to IEC/EN 60950
Specified value at 255 V, 50 Hz (LT)
Specified value at 127 V, 60 Hz (LT or UT)
0.25
< 0.1
< 0.1
1
In phase to phase configuration, the leakage current is lower.
Safety of Operator-Accessible Output Circuits
If the output circuit of a converter is operator-accessible, it
shall be an SELV according to the safety standard IEC/EN
60950.
Mains
~
~
Fuse
Fuse
10021a
AC-DC
converter
Output
+
SELV
–
The following table shows a possible installation configuration,
compliance with which causes the output circuit to be an SELV
circuit up to a configured output voltage (sum of nominal
voltages if in series or +/– configuration) of 56.5 V.
However, it is the sole responsibility of the installer to assure
the compliance with the relevant and applicable safety
regulations.
Table 22: Safety concept leading to an SELV circuit
Earth
connection
Fig. 50
Schematic safety concept
Conditions
Supply voltage
AC-DC converter
Grade of isolation between input and
output, provided by the AC-DC
Installation
Measures to achieve the resulting
safety status of the output circuit
Result
Safety status of the AC-DC
converter ouput circuit
converter
Mains ≤ 250 VAC
Double or reinforced
Installation according to the applicable
SELV circuit
standards
Description of Options
D Undervoltage Monitor
This option is designed for systems using backplanes or is
intended for use in applications, where a fuse or a decoupling
diode is fitted into the positive supply line to the system bus.
The status of the system bus/battery voltage can be monitored
rather than the output status of a single T unit. Input D set (pin
32) is not internally connected to Vo+ ( R int is missing; see fig.
20).
To maintain the adjustment capabilities and resistor values for
setting the different threshold values, a 43.2 k ? (21.5 k ?)
resistor should be fitted into the sense line to the bus. If D set
(pin 32) is left open, output D (pin 30) is permanently signaling
low bus voltage.
For details see also Auxiliary functions, Power Down .
F Externally Accessible Fuse
The standard T converters have a non-accessible fuse, 5 × 20
mm. Some applications require an externally accessible fuse.
Option F provides a fuse mounted on the rear side; see
Mechanical Data .
B1 Cooling Plate
If a cooling surface is available, the converters can be
provided with a mounting plate (option B1) instead of the
standard heat sink on the right-hand side; see Mechanical
Data .
Since approximately 50% of the losses have to be dissipated
through the remaining heat sink on the left-hand side, sufficient
free air flow must still be provided.
BCD20023 Rev AB, 02-Nov-2010
Page 28 of 31
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