PISA11.CLASS2
PISA11-Series
P
ROTECTION
M
ODULE
24V,
4
O
UTPUTS
7.
C
ONNECTING
C
APACITIVE
L
OADS TO THE
O
UTPUTS
Large input capacitors of drives, monitors or other similar loads can result in an unintended shutdown of the module
when trying to turn-on such loads. This especially can occur after a reset or by turning on a load via the push button or
the external signal input. The PISA protection module is designed to be exceptionally compatible with such types of
loads. The module can turn-on as much capacitance as possible and comprises several different protection mechanisms
to protect against an unintended shutdown or damage of the unit.
The permissible capacitor sizes which can be connected to the output of the PISA module depends on the load current
itself as well as on the characteristic of the load.
The following tables show two typical cases (case A and case B) for the permissible capacitors, which can be connected
on the outputs without shutdown of the protection module. The listed values are valid for the entire temperature
range.
Case A: All outputs are loaded.
The minimum values are worst-case figures for the permissible capacitors which are defined with an additional
constant current load and with the maximum permissible total current of the PISA protection module. See also the
parameter list below the table.
The typical values are defined with an additional resistive load. See also the parameter list below the table.
Permissible Capacitors
PISA11.CLASS2
Per channel
58mF
14mF
All four outputs together
typ.
58mF
min.
14mF
Parameters:
Typical values are with an additional 1.9A resistive load per output.
Minimum values are with an additional 3.7A constant current load per output.
Case B: Only one output is loaded
The minimum values for the permissible capacitors are defined with an additional constant current load according to
the parameter list below. During the tests, only one output is loaded and all others are not.
The typical values for the permissible capacitors are defined with an additional resistive load according to the
parameter list below. During the tests, only one output is loaded and all others are not.
Permissible Capacitors
PISA11.CLASS2
Per channel
typ.
68mF
min.
45mF
Parameters:
Typical values are with an additional 1.9A resistive load. Minimum values are with an additional 3.7A constant current
load.
Fig. 7-1
Test setup for capacitive load measurements
Power
Supply
24V,
min. 40A
-
+
PISA11
Protection
Module
Out-1
+
-
-
Out-2
Out-3
Out-4
8/19
Distribution Node
1m, 2.5mm
2
1m, 2.5mm
2
4x R
Sense
10mOhm
R / I
Load
R / I
Load
R / I
Load
R / I
Load
1m, 1.5mm
2
1m, 1.5mm
2
1m, 1.5mm
2
1m, 1.5mm
2
0.3m, 1.5mm
2
0.3m, 1.5mm
2
0.3m, 1.5mm
2
0.3m, 1.5mm
2
1m, 2.5mm
2
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.
www.pulspower.com Phone +49 89 9278-0 Germany
