D1555_D1558 installation manual 29042022 V5
5
PSU Fault
The normally closed (NC) fault opto-relay will open with the following fault conditions:
-
Thermal shutdown due to overload
-
Switch mode low-voltage output power fault
-
Switch mode over-voltage output power fault
-
12V output either shorted or overloaded
-
Battery disconnected fault
-
Low battery voltage fault
The relay contacts are voltage-free and floating. The PSU fault relay status will not be changed when the
output is switched on or off using the ON/OFF input.
ON/OFF Input
This input is 30V tolerant and 5V logic compatible. It has an internal 100K resistor pull-up connected to 5V and is
designed to work with 5V logic outputs, NO and NC voltage-free contacts and open-collector outputs.
If the ON/OFF input is left unconnected when the jumper is not fitted, the power supply will be switched on.
Switching examples are shown below:
ON /
OFF
0V
ON /
OFF
0V
Open
Collector
Normally closed
contacts
Jumper not fitted. PSU
output on when collector is
low (transistor on)
Jumper fitted. PSU
output on when contacts
are open
Battery Management
The battery is continuously monitored for connection and the charging output has reverse polarity and
safe-area current-limit protection. The battery has deep discharge cut-out protection when operating in
standby mode. The charging output uses constant current charging to reduce recharging times.
Maintenance
There are no serviceable parts or fuses. No maintenance is required other than routine periodic testing.
Please note that high voltage is present under the cage
–
handle with care. Do NOT touch. Do NOT
remove the cage.
