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Characteristics
Derating
The ambient temperature is a determining factor which limits the power that an electronic power supply can deliver
continuously. If the temperature around the electronic components is too high, their life will be significantly
reduced.
The nominal ambient temperature for power supplies ABL4 is, depending on the reference, 45, 50 or 60°C. Above
this temperature, derating is necessary up to a maximum temperature of 60°C.
The adjacent graph shows the
power as a percentage of the
nominal power that the power
supply can deliver
continuously, in relation to the
ambient temperature.
Temperature °C
P/Pn %
0
20
40
60
80
100
120
75
50
70
-20
20
30
45
50
55
60
0
ABL4 RSM24035/RSM24050/WSR24400
ABL4 WSR24200
ABL4 WSR24300
ABL4 RSM24100
In all cases, there must be adequate convection around the products to assist cooling.
There must be sufficient clearance around power supplies ABL4: refer to instruction sheet supplied with each
power supply and, also, downloadable from
www.schneider-electric.comTemporary overcurrents
Power supplies ABL4 have an energy reserve allowing them to supply the application, according to the
references, from 150% to 170% of the nominal current for 5 seconds and up to 30 seconds, whilst guaranteeing
an output voltage higher then 90% of the nominal voltage.
Power supply
Maximum temporary overcurrent
Maximum time of temporary overcurrent
ABL 4RSM24035
170%
of nominal current
30
seconds
ABL 4RSM24050
160%
of nominal current
30
seconds
ABL 4RSM24100
150%
of nominal current
30
seconds
ABL 4RSM24200
ABL 4WSR24
p
00
150%
of nominal current
5
seconds
The time interval between each overcurrent cannot be less than 10 seconds.
When the overcurrent value exceeds the reserve energy value or when the overcurrents are too closely spaced or
when the overcurrent is prolonged (depending on the reference), more than 5 seconds and up to 30 seconds, the
power supply switches to protection mode.
Behaviour in event of overcurrents and short-circuits
In the event of overcurrent or short-circuit, the power supply ABL4 switches to protection mode and periodically
attempts a reset (“Hiccup” mode) until the fault disappears. Once the output circuit load conditions return to
normal, the power supply automatically resets.
Power supply
Periodic reset frequency type
ABL 4RSM24035
ABL 4RSM24050
ABL 4RSM24100
Variable: depends on the overcurrent value and the ambient temperature.
In the event of a short-circuit (output voltage close to 0 V), the current is established for 50 ms
approximately every 1.8 seconds.
ABL 4RSM24200
ABL 4WSR24
p
00
Fixed: the current is established for 5 seconds every 15 seconds either in the event of an
overcurrent or a short-circuit.
Connecting in parallel
In order to increase the current available, the outputs of two power supplies with identical references can be
connected in parallel.
To obtain equitable sharing of the current between the two power supplies, the following precautions must be
taken into account:
v
Use two power supplies bearing the same date code and same reference.
v
Adjust the output voltages so as to obtain the same voltage value, to within plus or minus 20 mV, 10 minutes
after power-up with a load consumption of less than 20% connected on each power supply output.
v
Connect one of the “+” terminals and one of the “-” terminals of each power supply to a terminal using wires of
the same length and diameter.
v
Use wires with the largest cross-section as possible.
The maximum usable current is 1.8 times the nominal current of the power supply.
Redundancy of the power supply ABL 4RSM24200 can be achieved without adding a specific module, due to the
specific diode that is integrated in these products.
For other power supply references, redundancy module ABL 8RED24400 must be used.
Additional technical information on
www.schneider-electric.comCharacteristics
Power supplies and transformers
Phaseo
Regulated switch mode power supplies
ABL4
85
to 960 W - Compact - Rail mounting