American Fibertek N-TAH - Manual (Page 11)

11
LED indicators
Within 5 seconds of the power cable being connected, the N-TAH will perform a self test
of its front panel indicator LEDs. The LEDS will first light green, then red, then turn off.
Once the sequence has finished the LEDs will resume their normal function and the unit
will be ready for use.
The N-TAH has six LED indicators on the right side of the unit. The action of individual
LEDS is as follows:
Power indicator LED
The upper right LED is the Power Indicator. This LED indicates that power is applied to
the unit. During initial powering up of the unit, the power LED will briefly flash green,
then red for a moment. It should then light green and remain green while the unit is on.
Probe LED
The lower right LED indicates the status of the environmental probe function. During
initial powering up of the unit, this LED will briefly flash green, then red for a moment. If
any of the measured environmental conditions exceed their warning or alarm thresholds,
this LED will then illuminate red, otherwise it will illuminate green.
Alarm LEDs
The top center and top left LEDs indicate the status of the alarm inputs. During initial
powering up of the unit, these LEDs will briefly flash green, then red for a moment. They
will then be illuminated red if the corresponding alarm input is active, or off when the
corresponding alarm input is not active.
Aux Status LEDs
The bottom center and bottom left LEDs indicate the status of the aux contact outputs.
During initial powering up of the unit, these LEDs will briefly flash green, then red for a
moment. They will then be illuminated green if the corresponding aux contact output is
active, or off when the corresponding aux contact output is not active.
Real-time clock
The N-TAH’s real-time clock and calendar (RTC) uses a lithium battery to retain time
and date settings while the unit is not powered. It is strongly recommended that you not
attempt to replace this battery without technical assistance from AFI.