Tait TB8100 Service Manual page 239

Battery Protection
Limits
Table 13.4 PMU DC voltage limits
Parameter
User-programmable Alarms
Low Battery Voltage
High Battery Voltage
User-programmable Limits
Startup Voltage
(after shutdown)
Shutdown Voltage
Battery Protection (Fail-safe) Limits
Startup Voltage
Undervoltage Shutdown
Overvoltage Shutdown
Overvoltage Shutdown Reset
a. The information in this table is extracted from the TB8100 Specifications Manual. Refer to the latest issue of this
manual (MBA-00001-xx) for the most up-to-date and complete PMU specifications.
b. Using the Service Kit.
c. Only available if the standby power supply card is fitted.
Indicator LEDs
TB8100 Service Manual
© Tait Electronics Limited September 2006
The battery protection limits are set in hardware at the factory, and cannot
be adjusted by the user. These limits will not be reached under normal
operation conditions, but are provided as "fail-safe" measures to protect the
battery from deep discharge. They also remove the need for low-voltage
disconnect modules.
a
Voltage Range
12V PMU
b
10V to 14V
14V to 17.5V
bc
12V to 15.0V
10V to 13.5V
12V ±0.2V
9.5V ±0.3V
18.1V ±0.3V
17.1V ±0.3V
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 13.2 on page
24V PMU
20V to 28V
28V to 35V
23.9V to 30V
20V to 27V
24V ±0.5V
19V ±0.5V
36.2V ±0.5V
34.2V ±0.5V
225.
Power Management Unit Fault Finding
48V PMU
40V to 56V
56V to 70V
47.8V to 60V
40V to 54V
48V ±1V
38V ±1V
72.4V ±1V
68.4V ±1V
239