PISA11.CLASS2
PISA11-Series
P
ROTECTION
M
ODULE
24V,
4
O
UTPUTS
1.
I
NTENDED
U
SE
This device is designed for installation in an enclosure and is intended for the general use such as in industrial control,
office, communication, and instrumentation equipment.
Do not use this device in aircraft, trains, nuclear equipment or similar systems where malfunction may cause severe
personal injury or threaten human life.
This device is designed for use in non-hazardous, ordinary or unclassified locations.
2.
P
RODUCT
D
ESCRIPTION
This protection module fulfills two basic functions. First it distributes the current of a large power source to four NEC
CLASS 2 output channels and therefore allows for a simpler wiring method and easier approval process of the entire machine.
The second function is to permit only so much current on the outputs that the input voltage of this unit (which
corresponds to the output voltage of the power supply) does not fall below 21V. This ensures a reliable supply voltage
for sensitive equipments, such as PLCs, controls or sensors, when they are connected directly to the same power supply
as the PISA protection module.
The protection module has one 24V input and four output channels to which the current is distributed. Each output
channel is equipped with a redundant over-current protection, which avoids that wires will be overloaded. All four
output channels will shutdown simultaneously, if the current of one individual channel or the maximum allowed
current for the protection module is exceeded.
A safeguard circuit in the input stage of the PISA module works like a valve. It permits only so much current that the
input voltage does not drop below 21V. In case the input voltage would fall below this value (e.g. due to overloads,
too small of a power supply or high inrush currents such as from starting a motor), all four output channels will be
actively current limited and will shutdown after a certain period of time.
A typical wiring configuration is shown below. All sensitive loads are connected directly to the power supply. If
needed, these load circuits can be protected with standard circuit breakers or fuses. Loads which are less sensitive to
voltage dips or interruptions or which are the source
of the voltage drop themselves are connected to the
output of the PISA protection module.
Non NEC CLASS 2 Load
DC 24V
Power
Supply
NEC CLASS 2 Circuit 2
NEC CLASS 2 Circuit 3
NEC CLASS 2 Circuit 4
NEC CLASS 2 Circuit 1
A1
A2
A4
A3
PISA Protection Module
Safeguard
3.
I
NSTALLATION
R
EQUIREMENTS
This protection module is suitable for DIN-rail mounting. Use DIN-Rails according to EN 60715 or EN 50022 with a
height of 7.5 or 15mm.
The protection module can be used with any regulated 24Vdc power supply. If the power source can deliver more than
40A continuous, the PISA module shall be equipped with an external input fuse (e.g. 30/32A). The power capability
and performance of the power supply can limit the output characteristics of the PISA module.
Make sure that the input voltage polarity is correct before applying the input voltage.
Do not connect batteries to the outputs of the PISA11 module.
This device may only be installed and put into operation by qualified personnel.
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
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