Installation; Safety Related Notices - Siemens OLM/P11 V4.0 Operating Instructions Manual

Product Characteristics

4.2 Installation

4.2 Installation
4.2.1

Safety related notices

Only use the PROFIBUS OLM in the way intended in these operating instructions.
In particular, observe all warnings and safety-relevant notices.
Run the modules only with a safety extra-low voltage of a maximum of +32 V DC (typically +24
V DC) according to IEC 950 / EN 60 950 / VDE 0805. According to the UL/CSA-approval, the
power supply unit must meet the requirements of NEC, Class 2. Protective measures must be
taken to avoid the rated voltage of the equipment being exceeded by more than 40% by
transient overvoltages. This is the case if the equipment is supplied exclusively by SELV
circuits. Only the connectors supplied may be used for the electrical connection of the OLM,
(applies also when replacement parts are used). When using the existing connectors (e.g.
OLM V3), the proper contact cannot be guaranteed because of different pin diameters! The
supplied connectors must also be plugged in to achieve IP40.
Observe the electrical limit values when connecting voltage to the signaling contacts: 50 V DC,
30 V AC (CE) / 30 V DC, 30 V AC (cULus). The connected voltage must also be a safety
extra-low voltage according to IEC 950/ EN 60 950/ VDE 0805 and must to meet the
requirements of NEC, Class 2 in accordance with the UL/CSA approval.
WARNING: If temperatures in excess of 70°C occur on the cable or at the cable feed-in point,
or the temperature at the branching point of the cables exceeds 80 °C, special measures need
to be taken. If the equipment is operated at an ambient temperature of 50°C - 60°C, use
cables with a permitted operating temperature of at least 80 °C.
WARNING: – Explosion Hazard – Do not disconnect while circuit is live unless area is known
to be non-hazardous.
DANGER: Never connect the PROFIBUS OLM to mains voltage.
Choose the installation location so that the climatic and mechanical limit values as specified in
the technical specifications can be met.
WARNING: All PROFIBUS OLMs are approved for operation in the hazardous area zone 2
according to Ex nA IIC T4. In this case, the modules must be installed in a suitable enclosure
(cabinet) providing degree of protection IP54 according to IEC 529. In this situation, the
supplied connectors must be assembled.
Note: If PROFIBUS OLMs are supplied via long 24 V supply lines or over networks, measures must be
taken to prevent interference by strong electro magnetic pulses on the supply lines. These can occur,
for example, due to lightning strikes or when heavy inductive loads are switched. The robustness of the
PROFIBUS OLM against electromagnetic interference was verified by the Surge Immunity Test
according to EN61000-4-5. For this test, overvoltage protection for the voltage supply lines is
necessary. The Dehn Blitzductor VT AD 24V Type no. 918402 or a comparable protection element is,
for example, suitable. Manufacturer: DEHN+SÖHNE GmbH+Co.KG Hans Dehn Str.1 Postfach 1640 D-
92306 Neumarkt, Germany
Note: Under foreseeable circumstances, the accessible optical radiant power of the components used
represents no danger and meets the requirements for class 1 according to IEC 60825-1 Ed.1.2:2001-08.
Nevertheless, avoid looking directly into the transmitter or into the end of a fiber-optic cable.
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SIMATIC NET PROFIBUS, Optical Link Module
Operating Instructions, 07/2008, A2B00065774O, Edition V1.5