PISA-B-812-B1
PISA-B-812-B4
Apr. 2021 / Rev. 0.1 DS-PISA-B-812-Bx-xx-EN www.pulspower.com 11 / 20
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.
8. Digital Coded Interface (PISA-B-812-B4)
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.
Threshold value for start typ. 0.7V @ 1mA, 1.1V @ 5mA
Signal voltage max. +35Vdc
Signal current max. 10mA
Isolation voltage see chapter 19
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.
Fig. 8-1: Digital Coded Alarm Signal – Signal Sequence
9. Alarm Relay Contact (PISA-B-812-B1)
The device is equipped with an alarm contact. The normally closed (NC) contact closes as soon as one output channel has
switched off (common signalling) or the input voltage is lower than 19Vdc.
Contact ratings max. 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A, resistive load
min. Permissible load: 1mA at 5Vdc
Isolation voltage see chapter 19
10. Reset Input
A restart of switched-off channels can be done either by a button on the unit or by a control signal on the reset input
(pins 11-12). Therefore, push the corresponding channel control button for longer than 1s or apply a voltage between 10
and 30Vdc for longer than 1s to the reset input. The reset input is galvanically isolated from the rest of the device.
Reset voltage min. 10Vdc
max. 30Vdc
Reset delay min. 1s - apply the reset voltage for at least this time to restart switched-off channels
Signal voltage min. -35Vdc
max. +35Vdc
Signal current max. 6mA, current limited
Isolation voltage see chapter 19
11. Efficiency And Power Losses
Efficiency typ. 98.9% At 8x 5A output load
Power losses typ. 1W At no output loads
typ. 10.8W At 8x 5A output load
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