PISA-B-812-B1
PISA-B-812-B4
Apr. 2021 / Rev. 0.1 DS-PISA-B-812-Bx-xx-EN
www.pulspower.com
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All parameters are specified at 24Vdc input voltage, 8x5A output currents, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
4.
DC-Input
The input can be powered from a regulated power supply or a similar DC source. Use an appropriately sized power supply,
which can deliver the required output current.
If a power supply with a continuous output current greater than 50A is used, a fuse or circuit breaker with 63A (B- or C-
Characteristic) must be connected between the power supply and the electronic fuse module.
The continuous voltage between the input and ground must not exceed 60Vdc.
The input must be powered from a PELV or SELV source or an “Isolated Secondary Circuit” in order to maintain SELV or
PELV outputs.
Check for correct input polarity. The device will not operate when the voltage is reversed.
Input voltage
nom.
DC 24V
-20%/+25%
Input voltage range
19.2-30Vdc
typ.
19Vdc
Input voltage required to
switch on the outputs
max.
19.6Vdc
Input current
max.
40A
At fully loaded outputs
Stand-by current with no load current on the outputs
Internal current
consumption
typ.
40mA
For PISA-B-812-B1
typ.
35mA
For PISA-B-812-B4
5.
Output
The output can supply any kind of loads, including inductive and capacitive loads. The maximum size of capacitive loads is
specified in the table below (see Tab. 5-1). Larger load capacitors might result in an unintended turn-off of the channel.
More detailed information regarding allowable capacitive loads is available on request. If in doubt or when you do not
know the input capacitance of your load, we recommend to perform tests with the real load.
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. Factory setting is that all channels
are switched on.
When the sum of the output currents is greater than 40A, the device turns off the output channels one by one, starting
with the overloaded channels and followed by CH8 to CH1, until the sum current is less than 40A.
Channels 1 and 2 have a current limited output, while channels 3 to 8 have an overcurrent shutdown behaviour only.
– Do not apply reverse voltages from the load to the output terminals that are higher than 30V and last longer than 1s.
– 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.
In order to avoid too high peak currents on the 24V supply when applying the 24V supply voltage, the output channels are
switched on in delayed steps. Channel 1 switches on after 50ms followed by the remaining channels with a delay of 100ms
each. This scheme applies when all channels are switched on. Channels that are switched off are skipped.
Fig. 5-1: Turn-On sequence after applying an input voltage
