KK-641.002 Rev.No:1 01.08.12 ML-121X User Manual Page | 5
4- PANEL INPUTS
4.1 Mains power supply
The system is designed to operate with 230V AC 50Hz. Earth connections must be made to
earth terminal and earth resistor must be less than 10Ω. The mains supply of the panel must
be via an independent self-resetting fuse rated 230V AC 6A. This fuse must be separate from
the other fuses and a caution note should be written such as ‘ATTENTION! FIRE ALARM
CONTROL PANEL’S FUSE. DO NOT REMOVE’ to ensure safe operation of the panel.
Recommended cable types are 3x2,5 NYM or 3x2,5 NYA. Connections must be done
according to Annex- B, Figure-1.
Do not connect or disconnect loops, mains supply input and PCB connections while the panel
is energized, to avoid an electric shock.
4.2 Batteries
Batteries provide continuity of operation during a failure of the mains power supply. The panel
uses 2 units of 12 V DC 7Ah dry type batteries. Battery connection scheme can be seen from
Annex-B, Figure-14.
4.3 Detection Devices Inputs (Loop Lines)
ML-121X series panels are produced with 0, 1, 2 loop models. Panels with
0 loops (no-loop) are used as repeater panels. Each loop is capable of hosting up to 127
addressable devices. Connection of loop line to the control panel must be as like in Annex-B,
Figure-7. A 0Ω resistor must be connected to the unused loops. Each device in the loop must
be addressed via MG-8200 Address Programmer depending on the architectural project of the
site.
The semi-duplex two-wire digital serial synchronous communication between the devices
connected to the loop and the fire alarm control panel is established by the VIP
communication protocol.
Short circuit isolators must be placed in such a way that more than 20 detectors and/or
manual call points shall not be out of service in case of any short circuit occurrence in the
loop.
The devices should be connected to a one-pair cable to create a loop and should turn back to
the panel from the last device.
The loop is energized from the ‘out’ terminal of the panel and the turn back point toward the
panel is the ‘in’ terminal. In case of rupture or short circuit, the loop is energized from both the
‘in’ terminal and the ‘out’ terminal. Thanks to this functionality; it is provided that the devices,
except from the detectors / buttons which are in failure, go on functioning properly while the
part in failure is isolated.
It should be used the short circuit isolator for each ‘in’ and ‘out’ terminals. Thus, if any problem
occurs in between the part from any of the ‘in’ or ‘out’ terminals to the first short circuit isolator
location, this part is isolated and the rest of the loop can go on functioning properly.
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