Amber
Flashing when unacknowledged fault.
Steady lit when acknowledged fault.
PT100/PT1000
Red
Flashing when unacknowledged shutdown/load reduction.
Steady lit when acknowledged shutdown/load reduction.
Amber
Flashing when unacknowledged fault.
Steady lit when acknowledged fault.
4 Shutdown Channels
4.1 Switch Channels
Switch Channels are configurable for broken wire/loop monitoring and short circuit detection.
All switch channels use a two-wire layout, where both wires from the switch must be routed
to the SDU.
4.1.1 Broken Wire Detection
When correctly wired and configured (see Installation Manual) this will be detected and
indicated at the LED next to the switch input terminals.
4.1.2 Short CIrcuit Detection
When correctly wired and configured (see Installation Manual) this will be detected and
indicated at the LED next to the switch input terminals.
4.2 Analog Channels
One PT100/PT1000 and two 4-20 mA channels are available for shutdown/load reduction
configuration
4.2.1 Sensor Fault Detection
When correctly wired and configured (see Installation Manual) this will be detected and
indicated at the LED next to the analog channel input terminals.
4.3 Pickup Channel
When correctly wired and configured (see installation Manual) this will indicate that the MPU
is connected at the LED next to the MPU input terminals. This LED will also indicate MPU
faults.
In case of an active MPU sensor a secondary pickup source must be provided to SDU over
Modbus. In this case, the LED will indicate pickup mismatch.
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