Instruction manual – AP901 Arc Protection Unit
9 (39
)
A1017B
3
O
PERATION AND CONFIGURATION
3.1
LED
INDICATOR FUNCTIONS
AP901 contains 12 indication LEDs. A user definable text pocket can be slid in for identifying
each LED function (except Power and Error LEDs). LED’s are located at the front plate of the
unit for clear viewing without a need for opening doors.
During power up the unit performs a LED-test. All LEDs are turned on for 2 seconds and then
back off. Only the blue power LED will remain on. When powered up, the unit goes in 50ms
into protection mode even while the LED test is being performed.
In normal operation only the blue power LED is ON.
The sensor LEDs in inactive condition are off. If an arc sensor is activated the corresponding
sensor channel LED will turn on if the activation is longer than 1.5ms. The sensor LED
activation function is latched (steady light). To clear the LED the “SET” button should be
pressed.
In case of a loose sensor wire or configuration mismatch (new sensor attached without running
auto-configuration system setup, see chapter 3.3.1) situation the corresponding LED will start
flashing and the ERROR LED will activate.
The Binary I/O LEDs are indicating the I/O-line status. If any of the lines become active for
more than 1.5ms the corresponding LED will turn on (latch).
In trip situation the corresponding trip LED will turn on. Trip outputs are controlled by dipswitch
settings. (See chapter 3.5)
All activation and trip indication LEDs are latched, even if the dipswitch setting is in non-latched
mode. They have to be cleared by pushing the “SET” button.
LED indications are stored in non-volatile EPROM memory for identifying the trip information
in case the auxiliary power is lost. When re-powering the unit after power supply loss the actual
LED status can be visualized from the front of the unit.
