TB8100 Service Manual Power Management Unit Fault Finding 239
© Tait Electronics Limited September 2006
Battery Protection
Limits
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.
Indicator LEDs 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 225.
Table 13.4 PMU DC voltage limits
a
Parameter
Voltage Range
12V PMU 24V PMU 48V PMU
User-programmable Alarms
b
Low Battery Voltage
High Battery Voltage
10V to 14V
14V to 17.5V
20V to 28V
28V to 35V
40V to 56V
56V to 70V
User-programmable Limits
bc
Startup Voltage
(after shutdown)
Shutdown Voltage
12V to 15.0V
10V to 13.5V
23.9V to 30V
20V to 27V
47.8V to 60V
40V to 54V
Battery Protection (Fail-safe) Limits
Startup Voltage
Undervoltage Shutdown
Overvoltage Shutdown
Overvoltage Shutdown Reset
12V ±0.2V
9.5V ±0.3V
18.1V ±0.3V
17.1V ±0.3V
24V ±0.5V
19V ±0.5V
36.2V ±0.5V
34.2V ±0.5V
48V ±1V
38V ±1V
72.4V ±1V
68.4V ±1V
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.
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