MSA 9010 SIL, Operating Manual, Page: 20 / 76

19
Installation
GB
Model 9010/9020 SIL
Fig. 6 PCB fixing screws
3.2 Electrical installation
The installation location must be chosen in accordance with environmental conditions listed in
chapter 9 – Technical data.
WARNING!
The control unit must be installed in compliance with all applicable regulations, otherwise the safe
operation of the control unit is not guaranteed.
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 (See Appendix 12Fig. 18).
The control units were tested and developed in compliance with the EMC directives and the
current standards EMC (EN 50270). In order to guarantee conformity with the EMC standards,
several rules need to be observed during the installation phase:
• Avoid installations in areas with a presence of strong electromagnetic fields.
• To connect control units to the main power supply, a failure-free ground or failure-free potential
bonding conductor must be provided.
• The user must ensure an appropriate supply voltage in accordance with EMC directives.
• The main supply source must not be subjected to voltage variations exceeding the limits spec-
ified in this manual.
• The main supply source must be free of any surges and sudden voltage changes due to heavy
electrical loads and disturbances caused by inductive or capacitive loads, false contacts and
strong electromagnetic interference
• All detector and control cables must be shielded. Shielded cables must have at least 80 %
coverage.
• Shielded cables must be laid in a group. If cable lengths are to be extended using terminal
boxes, the boxes must be shielded and the internal connections must be kept as short as
possible.
• If the devices are supplied using a DC power supply, the supply cable must be properly
shielded.
• Control and detector cables must be installed physically separate from power supply cables,
with a distance of at least 30 cm.
• External devices used (horns, beacons, motors, etc.) must be shielded from radio frequencies
and must conform to EMC directives.
• MSA cannot be held liable for malfunctions and/or damage caused by electrical disturbances
that are due to natural phenomena (e.g. lightning strikes).