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www.abb.com/lowvoltage 2TLC172015M0201, rev. D
4 Electrical Installation
4.1 Important Notes on Installation
NB! The two OSSD outputs shall be connected to the stop function of the machine, so that they each stop
the hazardous moving parts. The Focus II system is by default in auto reset mode.
– Power to the system shall be by a 24 VDC±20%, supply which complies with standard EN 60742 (dual
isolation), or with equivalent isolation by VDE 0551. We strongly recommend a stabilized power supply.
– Voltage shall be disconnected when changing the installation.
– The screen of the cabling to the barrier shall be connected to ground circuit.
– The barrier should be protected by a fuse with the value 1 A normal in the feeding voltage.
– The external muting indicator (LMS) signalling that the muting function is active, shall be connected and
work for the muting function to work. The indicator should be placed so that it is visible from all sides
with access to the hazardous area of the machine. See connection example in 5 and text in 6.
– The OSSD outputs of the barrier are PNP outputs which are each current limited to 500 mA. If the cur-
rent will exceed 500 mA or if alternating current is to be connected, the system may benet from being
connected to a safety relay, see 5.
– Do not install the Focus II system in the following types of environments:
Areas
• exposed to intense interference light, such as direct sunligh
• near the frequency controlled motors or wires to them
• near magnetic valves with coils without suppressors
• with high humidity where condensation is likely to occur
• where corrosive gases are present
• exposed to vibration or shock levels higher than in the specication
• where the product may come into contact with water
• where the product may come into contact with oil that is an adhesive solvent
– Do not use radio equipment such as cellular phones, walkie-talkies, or transceivers near the Focus II
system.
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