MSA GasGard XL Instrucciones Para El Usuario página 12

3 Installation
3.2 Electrical Installation
WARNING!
The control system must be installed in compliance with applicable regulations; otherwise, an unsafe condition may exist.
Failure to follow this warning can result in serious personal injury or death.
During installation, use the internal earth connection to ground the instruments.
If an external earth connection is permitted or demanded by the local authorities, it serves merely as additional earthing.
• Select an installation location that complies with the environmental conditions indicated in the technical data.
• When installing the Control Unit, the following conditions must be met to comply with the European EMC Directive.
○ A fault-free ground or fault-free potential bonding conductor must be provided when connecting devices to the
main power supply.
○ Ensure an appropriate supply voltage in accordance with EMC directives.
○ If the devices are supplied from a direct voltage (DC) source, the supply cable must be shielded.
○ All sensor and control cables must be shielded.
Shielded cables must have at least 80% coverage.
○ Control and sensor cables must be installed physically separate from power supply cables.
○ Shielded cables must be laid in a group. If cable lengths are to be extended using terminal boxes, the boxes
must be shielded and internal connections must be kept as short as possible.
○ The control system can be simultaneously connected to AC voltage and 24 VDC (to enable an automatic
power switch to 24 VDC voltage if the AC main supply fails).
3.3 Power Supply
• Standard power supply 110-230 VAC/24 VDC (100 W) is used to power internal circuits and attached sensors.
• A switch or circuit-breaker shall be included in the building installation in close proximity to the equipment and within
easy reach of the operator. It shall be marked as the disconnecting device for the equipment.
• Main voltage is connected to terminal L (Line), N (Neutral), and ground.
Figure 7 Connecting the Main Supply
13 GasGard XL US