EN
PISA-B-812-B4 Installation Manual
The LED matrix display shows information about measurement, set parameters and errors and
contains two modes. To switch between the two modes, the measurement mode and the parameter
mode, push the SET button and the channel control button 4.
Measurement Mode
The “%” scale on the left side of the LED Matrix is used in this mode, which is also indicated by the
triangular LED below the LED matrix display. In this mode the actual current values are shown and the
LED matrix display also shows, if a channel has switched off due to a too high current or on purpose.
- One or more green/yellow LEDs are on: These LEDs indicate the actual channel current in percent
of the set value. Peak values are stored in a peak detector and are additionally shown with one
LED for a short period of time.
- Uppermost LED is red: This indicates a switched off channel. To switch the channel back on, the
corresponding channel control button must be pressed for at least 50ms. A further push switches
the channel off again.
- Uppermost LED is single flashing in red (2Hz): This indicates that a channel has switched off due to
too high current. A restart can be done either by a button on the unit or by a control signal.
Therefore, push the corresponding channel control button for longer than 1s or apply a voltage
between 10 and 30Vdc (max. 6mA current consumption) for longer than 1s to the reset input. The
reset input is galvanically isolated from the rest of the device.
- Uppermost LED is double flashing in red: This indicates that a channel has switched off because
the total current of the module exceeds 40A. In such cases, first the overloaded channels are
switched off, then channels 8 to 1 in descending order.
- Display of the settings for tripping currents and tripping characteristic: Push the SET button for
more than 50ms. First the tripping currents are displayed, followed by the tripping characteristic
with the letter “F” or “S”. This function ends automatically after 5s.
Parameter Mode
The “A” scale on the right side of the LED Matrix is used in this mode, which is also indicated by the
triangular LED below the LED matrix display. In this mode the set values for the tripping currents for
each individual channel are displayed and the LED matrix display also shows if a channel has
switched off due to a too high current or on purpose.
- Displaying of the set current: The green LED shows the set current of the individual channel.
- Displaying of the tripping characteristic: Push the SET button. The selected characteristic is shown on the
LED matrix for 2 seconds. Letter F indicates the fast and the letter S the slow acting characteristic. The
setting applies to all output channels.
- Red LEDs: These indicate a switched off or overloaded channel and include the same LED blinking
pattern and push-button behaviour as in the measurement mode. If a channel is set to 12A, the LED
below the uppermost LED will display this switched-off information.
Changing of Trip Currents and Trip Characteristic
Factory settings are that all channels are turned on with a 1A setting in a fast tripping characteristic
and in measurement mode. Parameters can be changed in the measuring mode as well as in the
parameter mode. Parameters can be changed regardless of whether a channel is switched off or not.
- Changing the current settings: Press and hold the SET button for at least 1s. The triangular green
"A" LED starts flashing. After that, shortly tap the channel control button multiple times to adjust the
current step by step. When the desired setting is found, press the SET buttons for more than 50ms
to save the setting. This mode ends automatically 10 seconds after no more buttons are pushed. In case
the settings are not saved by pressing the SET button, changes of tripping currents are not stored.
- Changing of the tripping characteristic (slow or fast): To change the characteristic for all channels push the
SET and the channel control button 3 at the same time. The selected characteristic is shown on the LED
matrix for 2 seconds and stored automatically. Letter “F” indicates the fast and“S” the slow acting
characteristic.
Key Combination Overview
SET + CCB1 button = lock/unlock setting with PIN
SET + CCB2 button = show FW versions
SET + CCB3 button = fast/slow tripping characteristic
SET + CCB4 button = measurement/parameter mode
Wiring Scheme
Power
Supply
+
-
PISA-B
Fuse
Module
Ch 1
24V,
max.
40A
+
-
+
-
Ch 2
Ch 8
+
-
PISA-B
Fuse
Module
Ch 1
+
-
+
-
Ch 2
+
-
Ch 8
+
-
Power
Busbar
+
-
+
-
+
-
Load
1
Load
2
Load
8
Load
9
Load
10
Load
16
Power
Busbar
LED Light Pattern in Measurement Mode
LED Light Pattern in Parameter Mode
Description:
Channel 1
is loaded with 40-60% of
the set current
Channel 2
has tripped due to over
current – no output
Channel 3
is turned off on purpose
(with push-button)
Channel 4
is loaded with 80-100%
of the set current
Channel 5
is turned off on purpose
(with push-button)
Channel 6
is loaded with 40-60% of
the nominal current
Channel 7
is loaded with 0-10% of
the nominal current
Channel 8
has tripped due to over
current – no output
Description:
Channel 1
is set to 12A and output is
turned off on purpose (with push-
button)
Channel 2
is set to 4A and output
has tripped due to over current
Channel 3
is set to 6A and output is
on
Channel 4
is set to 8A and output
has tripped due to over current
Channel 5
is set to 2A and output is
turned off on purpose (with push-
button)
Channel 6
is set to 10A and output is
on
Channel 7
is set to 1A and output is
on
Channel 8
is set to 3A and output
has tripped due to over current
Front Side and User Elements
1
3
2
4
5
6
7
8
140%
120%
100%
80%
60%
40%
20%
10%
LED
matrix
display
SET
button
Channel
control
buttons
(CCB)
Bar graph for
channel 1
Bar graph unit
indicator
10-140% LEDs
shows the
actual current
in relation
to the set
current
12A
10A
8A
6A
4A
3A
2A
1A
%
A
Bar graph
for
channel 8
Maximal Average Output Current per Channel Depending on the Ambient Temperature (Derating Table) - Examples
Ambient Temperature
Sum of all channel currents
CH1
CH2
CH3
CH4
CH5
CH5
CH7
CH8
-25°C to +40°C
max. 40A
12A
12A
10A
10A
10A
10A
10A
10A
+41°C to +50°C
max. 40A
10A
10A
10A
10A
8A
8A
8A
8A
+51°C to +55°C
max. 40A
12A
12A
8A
8A
8A
8A
8A
8A
+51°C to +55°C
max. 40A
10A
10A
2A
10A
2A
10A
2A
2A
+56°C to +60°C
max. 40A
8A
8A
8A
8A
8A
8A
8A
8A
+56°C to +60°C
max. 40A
12A
12A
6A
6A
6A
8A
8A
8A
+61°C to +70°C
max. 30A
12A
12A
6A
6A
6A
6A
6A
6A
1
3
2
4
5
6
7
8
140%
120%
100%
80%
60%
40%
20%
10%
12A
10A
8A
6A
4A
3A
2A
1A
%
A
LED off
Green LED on
Red LED on
Red LED
flashing (2Hz)
Green LED on
LED off
LED off
Green LED on
Red LED on
Red LED
flashing (2Hz)
10A
8A
6A
4A
3A
2A
1A
1
3
2
4
5
6
7
8
140%
120%
100%
80%
60%
40%
20%
10%
12A
%
A
Green LED on
LED off
