Safety device unit
OPM 520 en-GB 29
© Scania CV AB 2018, Sweden
LEDs
The LEDs indicate status, engine shutdown or
faults. When an LED is flashing, there is a new
event which has not been acknowledged. When
an LED is constantly on, there is an event which
has been acknowledged but which is still active.
Status LEDs
LEDs for engine shutdown and faults
Shutdown
Fault
LED Description
Power On when the safety device unit has a voltage above 21 V. Flashes if the voltage is below
21 V. Alarm if the voltage is below 21 V for more than 30 seconds. If the voltage drops
below 18 V, the safety device unit shuts down all channels.
Crank Cutoff Lights when the engine speed is above the set limit value.
Running Lights when the safety device unit gets a signal that the engine speed is above the set
limit value, which is normally 400 rpm.
Tacho 1/Tacho 2 Lights when the engine speed is above 5 rpm.
Shutdown Override Lights when engine shutdown override control is activated.
Buzzer Lights when the buzzer is activated.
COM 1 Flashes when the safety module communicates with the main display.
COM 2 Flashes when the safety module communicates via Modbus RTU interface.
COM 3 Flashes when the safety module communicates with the Ethernet interface.
LED Description
Switch 1 Lights at engine shutdown due to impermissible engine oil pressure.
Switch 2 Lights at engine shutdown due to high coolant temperature.
Switch 3 Lights at engine shutdown due to remote controlled emergency stop.
Switch 4 Lights at engine shutdown due to too high coolant pressure.
Switch 5–8 Lights at engine shutdown due to customer configured settings.
Shutdown Lights at all engine shutdowns.
Overspeed Lights at engine overspeed. Flashes rapidly at engine overspeed test.
LED Description
Switch 1–8 Lights at open circuit for the respective sensor.
Shutdown Coil Lights at open circuit for the Shutdown Coil output.
Shutdown Override Lights at open circuit for the Shutdown Override input.
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