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8009389/YN39/V3-0/2015-08| SICKOPERATING INSTRUCTIONS|GM35
Subject to change without notice
PROJECT PLANNING INFORMATION
3.9.1 CAN bus wiring
Standard cables
An installation location in the vicinity of the measuring point is generally selected for the
EvU so that the 4 m CAN bus cable delivered is sufficient for cabling without additional
installation effort. CAN bus extensions, ready for connection with plug-in connectors, are
also available in various lengths (
see “Connection cables”).
Installation away from the evaluation unit
A 6-pole terminal box can be supplied when the EvU is to be located some distance from
the SR-unit. This is then connected to the SR-unit using the 4 m CAN bus cable delivered
with the measuring system. A customer cable suitable for CAN bus applications, 6-pole
cable (twisted pair wires and shielded), then leads to the EvU. The total length of the CAN
bus connections, including the one to the reflector, may be up to 1000 meters. When
performing maintenance or service, it must be possible to deinstall the EvU temporarily
and connect it directly to the SR-unit at the measuring point.
Laying the cables
▸ Provide adequate cable lengths at the connection points.
▸ Whenever possible, do not lay power supply cables immediately next to signal cables.
▸ Protect open ends of preinstalled cables against weather effects until device
installation.
▸ Install separate power supply cables and circuit breakers for:
– GM35 SR-unit (via connection unit or terminal strip in control cabinet)
– Purge air units; additional motor circuit breakers and optional protective phase failure
switches.
– Evaluation unit
▸ Install easily accessible cable ducts or empty tubes for prefabricated cables or cables
delivered with the system,
see “Cable routing diagram”, page 33 (marked with one or
two plug-in connectors ). Approx. 2 m cable lengths each should be available at the
measuring point for later maintenance work on the measuring system when dismounted
from the duct.
▸ Lay cables provided by the customer (shown without plug-in connectors) according to
see “Cable routing diagram”, page 33.
CAUTION: Risk of device damage due to switching off the voltage supply
unintentionally
The purge air supply may not be switched off while the measuring system is on
the gas duct.
▸ Attach clearly visible warnings against accidental switching-off to all
switching devices where the purge air supply can be switched off.
WARNING: Risk of fire due to hot gas escaping in installations with
overpressure conditions
On installations with overpressure, the purge air hose can be severely
damaged by escaping hot gas and can catch fire depending on the
temperature.
On plants with overpressure as well as gas temperatures over 200°C:
▸ Ensure reverse flow is prevented by fitting a (trip) flap or a valve.
▸ Regularly check the functionality of the reverse flow safeguard.
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