MERak
MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 – S2.5
©
MERak. All rights reserved
Instruction and Connection Manual
10 of 20
Connect the lead-acid battery at
J2 B+
(battery 12 Vdc) and
J2 B-
(battery GND).
In this way, the set assumes responsibility for charging the battery and performs
measurement of the charge remaining. If desired, the set can generate automatic calls to the
maintenance company for the installation, in the event that the battery tension falls below the
threshold programmable by the user (as required by the standard EN. 81-28), or is
disconnected.
Programming the
*08#
register, the telephone will make these automatic calls in these
cases. To deactivate the calls, it is only necessary to deprogramme the same register.
If the supply equipment recommended by MERak is not used, a stable and regulated
source should be used, which should be located as close as possible to the set to avoid the
possible introduction of electromagnetic parasites in a long supply cable.
If it is not desired to use an emergency battery exclusively for the telephone
(at the
responsibility of the installing company)
but grid power only, this should be connected at the
terminals provided for the supply
J2 V+
and
J2 V-
.
WARNING!
NEVER connect the mains supply to the battery terminals.
7.3.
RS-485 serial communications connector (J3)
Communication with the control system or other devices such as the graphical viewer
may be carried out via the
J3
connector, which is an RS-485 interface. For more information see
chapter 15.
The transmission speed, the number of bytes and parity can be modified according to
the needs of the equipment where it is connected, but only by means of programming with the
software
serviLift,
available at the MERak website (www.merakeurope.com). A more detailed
explanation of how this bus functions can be found in the
PC Mode Commands Manual
, available
on MERak website.
7.4.
Telephone line (J4)
To connect the set to a phone line, the
J4.1
and
J4.3
terminals should be used. This must
always be an analogue line.
Connection of the earth terminal
J4.2
denoted
, is used to protect the equipment from
high energy transients in the telephone lines caused by storms and similar phenomena. If the
connection to earth is omitted, the protection devices provided will be totally ineffective. The
equipment will work just the same in this case, but the probability of faults rises considerably.
MERak strongly recommends the use of this earth connection
.
It is not recommended to use the emergency telephone connected to an exchange
because in the event of a power failure, availability of the telephone line is not guaranteed.
