Battery Management - Multiplex Profi TX Operating Instructions Manual

Transmitter
2.4.4

Battery management

The PROFI TX records the current during transmitter operation and while charging
the transmitter battery. The available battery charge is calculated on the basis of
the power meter reading, the temperature and the voltage. The remaining
operating time (time to empty) is calculated from charge and current and is shown
on status display #2 (see page 88). The calculation takes into account that current
consumption slightly decreases with decreasing battery voltage.
Battery alarm
If the remaining operating time falls below a configurable threshold, the remaining
operating time is announced with increasing frequency. The "TX-BATT." section on
the left side of status display #2 flashes.
The factory setting for the alarm threshold is 60 minutes. This value can be
changed in the Setup > Transmitter > Battery alarm menu (see
section 4.3.9 "Transmitter" on page 114).
Self-discharge
If the transmitter is stored for a prolonged period, the available battery charge is
estimated based on the idle voltage when the transmitter is switched on. For this
reason, the displayed charge and time to empty are not initially very accurate.
After one to two charge / discharge cycles the original accuracy is restored.
Under-voltage cut-off
If the operating voltage falls below 2.8V, the device is automatically switched off
without further warning. If the voltage is below 2.9V, it cannot be switched on: The
following message is briefly displayed on the screen: BATTERY DOWN!
Charge the transmitter battery!
If voltage is low, recharge the battery as soon as possible (within 1-2 days) to avoid
damage due to deep discharge. Observe the notes on charging (see section 2.4 "
Transmitter battery" on page 40).
PROFI TX
Page 43