MERak
MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 – S2.5
©
MERak. All rights reserved
Instruction and Connection Manual
16 of 20
12.
MONITORING BATTERY CHARGE
The MMk-656 is designed to carry out a very precise measurement of the charge state of the
emergency battery connected to it. To perform this measurement, the telephone disconnects itself
from the electrical supply (terminals
J2 V+
and
J2 V-
) every 2 hours to measure the battery charge.
On making this temporary disconnection from the electricity grid, if there is no battery
connected or it is very low, the set will be left without supply and will turn itself off. If electricity is
supplied to it again, it will restart but as of that moment the equipment will log the fact that it has
been reset due to the absence of battery, and will not carry out any more measurements until two days
have passed, to avoid its restarting itself every 2 hours. This anomalous situation will be signalled by
an alternating orange/red blink on the status LED.
If after two days, the measurement is made, and the necessary battery tension has been
recovered for the set not to turn itself off, it will return to its normal state and resume the normal
tension measurement cycle every two hours.
If the installation has been checked, or the battery has been replaced, manually, before the two
days have passed, the set can be restored to its normal battery state measurement cycle. To do this, it
is necessary to issue the command
*91#
or its equivalent in PC mode. Once this command has been
entered, and the programming process has been completed (hang up the intercom, or finish the call)
the equipment will disconnect itself from the grid supply to make another measurement, and
therefore we need to wait a bit over a minute for it to check the tension of the updated battery.
In the event that the battery passes the lower tension threshold defined as low battery (11.00V
DC
by default), the status LED will signal the status by alternating green and red. In this state, battery
measurements will continue to be made every two hours, and if it charges sufficiently and passes the
recovered battery tension threshold (by default 12.00
DC
), the set will return to its ready state.
The minimum and maximum thresholds may be modified by means of their corresponding
commands in PC mode.
13.
AUDIO ADJUSTMENT
The MMk-656 has two audio adjusters by means of potentiometers located on the upper part of
the set, accessible from orifices in the lower part.
The adjuster labelled
1
controls the level of the speaker incorporated into the telephone module.
The adjuster labelled
2
controls the sensitivity incorporated into the telephone module.
NOTE: While the set comes from the factory with optimal audio levels already configured, it is
essential to carry out a test call during the installation, to check the correct functioning of the system,
since once installed in the car, the position of the audio module or possible obstacles in the audio
path may require that the gains be adjusted.
