ADDITIONAL INFORMATION
28 November 2006 / Masterlink BTM-III / EN
11 ADDITIONAL INFORMATION
11.1 BATTERY ALARM FUNCTION
The Masterlink BTM-III continuously monitors the
state of charge of the batteries. If the State Of
Charge drops below a pre-set value or the battery
voltage is either too high or too low, the alarm
function is activated. For external alarm a small relay
can be applied (see installation instructions, chapter
4). This relay can be used for instance to activate an
audible alarm or to switch on a battery charger or
generator set
If an external relay is applied, make sure that the
alarm function is enabled (see chapter 9.6)
The Alarm function is activated when one of the
following is conditions met:
1 The actual battery voltage is below the low
voltage setpoint (chapter 9.7) for at least the
“alarm delay time” (chapter 9.9), or
2 The actual state of charge is below the State of
Charge level for “empty battery” (chapter 9.10),
or
3 The actual battery voltage is higher than the high
voltage setpoint (chapter 9.8).
The Alarm function is switched off again if one of the
following is conditions met:
1 The “maximum runtime” (chapter 9.13) has
elapsed, or
2 The “minimum runtime” has elapsed (section
9.12) and the actual state of charge is higher
than the “State of Charge level for full battery”
(section 9.11)
11.2 CHARGE EFFICIENCY FACTOR (C.E.F.)
Every battery has a total efficiency. This means that
there must be more Ah charged into the battery than
can be consumed. This ratio is expressed by means
of the Charging Efficiency Factor (CEF). It is used to
correct the calculation of the consumed Amphours
(section 6.2) and the time remaining function
(chapter 6.1)
A standard wet type lead acid battery has an
efficiency of approx. 89 % while an AGM has an
efficiency of approx. 95 and a gel type battery
approx. 94 %. The efficiency of a battery is improved
after it has been used for 5-10 cycles. For the rest of
Battery voltage
State of Charge
State of Char
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