PISA11.CLASS2
PISA11-Series
P
ROTECTION
M
ODULE
24V,
4
O
UTPUTS
6.
C
URRENT
L
IMITATION AND
S
HUTDOWN
B
EHAVIOR
The PISA11 protection module comprises one common limitation and switching element for all four outputs. In a
protection event, all four outputs limit the current or shutdown at the same time.
The following reasons can cause a limitation of the output currents or a shutdown of the output channels:
1) The output current of one or more output channels was too high.
2) The sum of the output current of all four output channels was exceeded.
3) The outputs needed to be shutdown in order to maintain sufficient input voltage.
Shutdown times
*)
when exceeding the rated output current:
At 2-times the rated current
typ.
1s at 7.4A
At short circuit
typ.
10ms
*)
The timer for shutdown starts immediately once the rated current levels are exceeded. All output channels will shutdown, if one channel
is overloaded. See Fig. 6-1 for more values.
A shutdown of the outputs can also happen earlier, e.g. when the PISA module has to protect the supply voltage in case the power
supply can not deliver enough current to support all loads without going into overload.
Fig. 6-1
Shutdown characteristic
Shutdown Time, typ.
100ms
1s
10s
100s
Output Current, typ.
0
6/19
10ms
2
4
6
8
10
12
14
16
18
20
22
24
26A
1
3
5
7
9
11
13
15
17
19
21
23
25
Feb. 2012 / Rev. 1.3 DS-PISA11.CLASS2 - data sheet -
All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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