EN
PISA-B-812-B4 Installation Manual
Product Description
The PISA-B-812-B4 is a DIN-rail mountable eight channel protection module with integrated electronic
fuses for 24V systems.
Intended Use
This device is designed for installation in an enclosure and is intended for commercial use, such as in
industrial control, process control, monitoring and measurement equipment or the like.
Do not use this device in equipment, where malfunctioning may cause severe personal injury or
threaten human life without additional appropriate safety devices, that are suited for the end-
application.
If this device is used in a manner outside of its specification, the protection provided by the device may
be impaired.
Installation Instructions
Install the device in an enclosure providing protection against electrical, mechanical and fire hazards.
Install the device onto a DIN-rail according to EN 60715 with the input terminals on top of the unit.
Up to eight devices can be connected via two bus bars, where only the first device is connected to the
power supply. The bus bars must be long enough to make a connection to all contacts of the devices.
Use an appropriately sized 24V power supply, which can deliver the peak current required to trip the
load channels. If peak currents are too low, the supply voltage for the protection module can no longer
be maintained, which results in a malfunctioning of the protection module.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper
cables that are designed for a minimum operating temperature of 60°C for ambient temperatures up to
+45°C, 75°C for ambient temperatures up to +60°C and 90°C for ambient temperatures up to +70°C.
Ensure that all strands of a stranded wire enter the terminal connection.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or
frost is allowed.
The enclosure of the device provides a degree of ingress protection of IP20. The housing does not
provide protection against spilled liquids.
The isolation of the devices is designed to withstand impulse voltages up to 1.5kV according to IEC
60664-1.
The input can be powered from a regulated power supply or a similar DC source.
The input must be powered from a PELV or SELV source or an “Isolated Secondary Circuit” in order to
maintain a SELV or PELV output.
Check for correct input polarity. The device will not operate when the voltage is reversed.
A disconnecting means shall be provided for the input of the device.
The device is designed as “Class of Protection III” equipment according to IEC 61140.
The device is designed for convection cooling and does not require an external fan. Do not obstruct
airflow and do not cover ventilation grid!
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and
right side. Increase the 5mm to 15mm in case the adjacent device is a heat source. Between multiple
PISA-B modules, no clearance is needed.
The device is designed for altitudes up to 5000m (16 400ft).
The maximum surrounding air temperature is +70°C (+158°F). The operational temperature is the
same as the ambient or surrounding air temperature and is defined 2cm below the device.
The device is designed to operate in areas between 5% and 95% relative humidity.
Functional Description
The output can supply any kind of loads, including inductive and capacitive loads. The maximum size
of capacitive loads is specified in the “Technical Data” table. Larger load capacitors might result in an
unintended turn-off of the channel.
Do not load the individual channels with higher average currents depending on the ambient
temperature, as specified in the derating table of this document.
Do not apply return voltages from the load to the output terminals higher than 30V.
Do not parallel outputs for higher output currents.
Do not connect outputs in a series connection for higher output voltages.
Do not connect batteries for charging purposes to the output of the device.
Output channels can be switched on and off separately by pushing the corresponding control button
for longer than 50ms. A switched off channel is displayed with the uppermost red LED of the LED bar
graph.
If the sum output currents is larger than 40A the unit turns off the output channels one after another
until the sum current is below 40A.
The tripping current can be set individually for all channels.
The tripping characteristic can be set as a common parameter for all channels.
Tripping currents and characteristic setting can be protected against changes with a PIN code. To lock
the settings push the SET and channel control button 1 until the unit shows a moving text “PIN TO
LOCK”. Enter a 4-digit PIN by pushing any combination of channel control buttons 1-8. Push the SET
button to save the PIN, the unit shows a moving text “LOCKED”.
To unlock settings push the SET and channel control button 1, the unit shows a moving text “PIN TO
UNLOCK” and enter the 4-digit PIN you selected and confirm it by pushing the SET button.
The device is equipped with a “Digital Coded Alarm Signal” output (pins 13 and 14), which provides
information about individual channel tripping. The signal is an opto-coupler-type output which is low
ohmic for start bit and for tripped channels. The maximal signal current between pins 13 and 14 is
10mA and the maximal voltage is 35V.
The signal sequence starts with 200ms start bit followed by a 100ms gap and 100ms signal related to
CH1 etc. The whole sequence is periodically repeated every 1900ms.
Technical Data
All values are typical figures specified at 24Vdc input voltage, 8x 5A output
currents, 25°C ambient temperature and after a 5 minutes run-in time
unless otherwise noted.
Input voltage
DC 24V
-20%/+25%
Required input voltage for
turning-on of outputs
19.6Vdc
Input current
40A
Internal consumption
35mA
Nominal output current
Adjustable
1/2/3/4/6/8/10/12A For CH1 and CH2
1/2/3/4/6/8/10A
For CH3-CH8
Sum current all channels
40A
Below +60°C ambient
30A
At +70°C ambient
Derate linearly b60°C and +70°C
Current limitation
CH1-CH2
200%
For 1A setting
150%
For 2 - 8A settings
130%
For 10 - 12A settings
CH3-CH8
50A
Tripping characteristics
Slow or fast
Selectable
Tripping delay
CH1-CH2
2ms – 2s
At short circuit
CH3-CH8
<10ms
At short circuit
CH1-CH8
1.1s
For slow tripping setting
at 1.5x nominal current
CH1-CH8
0.22s
For fast tripping setting
at 1.5x nominal current
Max load capacitance capability
CH1-CH2
100mF
Per channel
CH3-CH8
20mF
Per channel
Voltage drop per channel
CH1-CH2
125mV
For 10A load
CH3-CH8
165mV
For 10A load
Standby losses
1W
Power losses
10.8W
At 8x 5A load current
Temperature range
-25°C to 70°C
Max. wire size (litz wire)
16mm²
For input terminals
Max. wire size with ferrules
10mm²
For input terminals
Wire size AWG
AWG 20-4
For input terminals
Maximum wire diameter
6.1mm
For input terminals
Wire stripping length
19mm/ 0.75inch
For input terminals
Max. wire size (litz wire)
2.5mm²
For output terminals
Max. wire size with ferrules
1.5mm²
For output terminals
Wire size AWG
AWG 24-12
For output terminals
Maximum wire diameter
2.3mm
For output terminals
Wire stripping length
10mm / 0.4inch
For output terminals
Max. wire size (litz wire)
2.5mm²
For signal terminals
Max. wire size with ferrules
1.5mm²
For signal terminals
Wire size AWG
AWG 24-12
For signal terminals
Maximum wire diameter
2.3mm
For signal terminals
Wire stripping length
10mm / 0.4inch
For signal terminals
Size
(w x h x d)
52x124x130mm
Without DIN-rail
Weight
370g/0.82lb
Functional Diagram
+
-
Ch 1
Channel Switch,
Current Sense
+
-
Ch 2
Channel Switch,
Current Sense
+
-
Ch 8
Channel Switch,
Current Sense
Master Switch
(Fail-safe)
Controller
LED Matrix
Display
+
-
Input
13
14
Digital
Coded
Alarm
Signal
11
12
Reset
Input
Control
Button Ch 1
Control
Button Ch 2
Control
Button Ch 8
+
SET Button
+
-
Power Busbar
Digital Coded Alarm Signal – Signal Sequence
CH1
Alarm
CH2
Alarm
CH6
Alarm
Start
Bit
Start
Bit
100ms / DIV
1 Sequence (1900ms)
Example: CH1, CH2 and CH6 have tripped
