MSA GasGard XL Manuel D'utilisation page 8

Wall Mount Enclosure
The Control Unit:
• is housed in an ABS enclosure in accordance with IP 56 and NEMA 4X
• dimensions are 515 mm x 277 mm x 129 mm (20 x 11 x 5 inches)
• cable entry points are not provided, but are predesigned on the bottom of the enclosure (0.75" or
M20)
• front panel is molded with predesigned holes for fully equipped configuration (eight channels)
• is mounted by four screws (1/4 - 20 or M6).
Power Supply
• The 100 W power supply accepts main AC and DC power.
• In case of loss of main power, the power supply automatically switches to backup battery.
• Power source for detector is 24 VDC.
Backup Battery
Two batteries in series (12 VDC/2.2 Ah lead acid) can be used in the Control Unit as an option. The
batteries supply 20 minutes of backup for eight catalytic combustible sensors.
To activate battery backup, the pc software must be configured. Go to Settings, Service Function,
Device Settings. Check the Battery Backup box to activate, save and then download settings to the
Control Unit.
Do not use primary non-rechargeable batteries.
Operation under back-up power is indicated by the Power LED blinking on the front panel.
Main Board
The Main board microcontroller includes:
• watchdog
• internal buzzer (85 dB)standard common outputs
• battery charger circuit.
All necessary information is stored on the Main board. The following communications are possible:
• 1 Ethernet configurable for ModBus TCP/IP (galvanically isolated)
• 1 RS485 configurable for ModBus RTU (galvanically isolated)
• 1 USB configurable for ModBus RTU.
NOTE: Communication doesn't interfere with operation of the Control Unit.
• For SCADA visualization software, all three interfaces can be used.
• For service access, as a safety precaution, only the two ModBus RTU communications can be
used.
Standard common outputs are incorporated:
• two SPDT (Single Pole Double Throw) relays common alarm (ALARM 1 and ALARM 2)
• one DPDT (Double Pole Double Throw) relay common fault
• two addressable common horn relays.
GasGard XL
Description
US
8