Tait TB8100 Service Manual page 225

Task 2 —
Check Indicator
LEDs
Table 13.2 PMU indicator LED states
Green Red
off off
flashing off
(3Hz)
on off
on flashing
(3Hz)
flashing flashing
(on 300ms, (on 300ms,
off 2700ms) off 2700ms)
flashing flashing
(on 300ms, (on 300ms,
off 4700ms) off 4700ms)
flashing flashing
(3Hz) (3Hz)
TB8100 Service Manual
© Tait Electronics Limited September 2006
The indicator LEDs on the front panel are used to indicate the state of the
PMU and its microprocessor. There are two LEDs, one red and one green.
Each LED can be on, off, or flashing at two rates (fast or slow). The state
of these LEDs can indicate a number of operating modes or fault conditions,
as described in Table
PMU condition
power off (input above or below safe
operating range)
no application firmware loaded
the microprocessor is operating; no
alarm detected
one or more alarm conditions
detected:
output is overvoltage
output is undervoltage
output is current-limiting
overtemperature
mains failure
battery voltage is low
battery voltage is high
shutdown is imminent
DC converter is faulty
battery is faulty, or DC converter is
switched off
auxiliary power supply is faulty
PMU is not calibrated
self-test has failed
PMU is not configured
PMU is in battery protection mode
PMU is in Deep Sleep mode
Service Kit LED test - LEDs flash
alternately
13.2.
Procedure
check PMU is turned on
check power supply/power
connectors
use the Service Kit to download the
firmware, then recalibrate the PMU
–––
go to
go to
go to
–––
Power Management Unit Fault Finding
Task 3
"DC Module" on page 230
"DC Module" on page 230
225