12/01 AWB2700-1428GB
Engineering
9
Ventilation
A minimum gap of 5 cm between passive components must be
provided in order to ensure sufficient ventilation. If active compo-
nents (e.g. load power supply, transformers) are fitted next to each
other, a minimum gap of 7.5 cm must be ensured. Observe the
values specified in the technical data.
Device arrangement
Mount the UPS unit and the controller horizontally in the control
cabinet as shown in the following figure.
Preventing interference
Cabling and wiring
The following cable types are required:
• Heavy current cables (e.g. power cables carrying high currents,
or cables to current converters, contactors, solenoid valves)
• Control and signal cables (e.g. digital input cables)
• Measuring and signal cables (e.g. fieldbus cables)
Ensure correct cable routing inside and outside of the control
cabinet in order to keep interference to a minimum:
X Avoid laying cables with different power levels in parallel.
X Always separate AC from DC cables.
X Observe the following minimum gaps:
– Between heavy current cables and signal cables at least
10 cm
– Between heavy current and data/analog cables at least
30 cm.
– Make sure that the supply and return cables belonging to
each circuit are laid together. The opposing direction of
current flow means that the sum of all the currents is zero, so
that any fields which are produced are compensated.
Suppression of interference sources
X Keep all suppressor circuits as close to the interference source
(contactor, relay, solenoid) as possible.
Shielding
X Connections to data interfaces should be implemented with
shielded cables. General guideline: the lower the coupling
impedance, the better the shielding effect.
Lightning protection measures
External lightning protection
All cables linking buildings must be shielded. Metal conduits are
recommended as the most suitable means of protection. Signal
cables must be provided with overvoltage protection in the form of
varistors or other overvoltage arresters. This should be imple-
mented as close as possible to the point where the cable is routed
into the building, and at least before the cable enters the control
cabinet.
Internal lightning protection
Internal lightning protection includes all measures that reduce the
effect of lightning current and its electrical and magnetic fields on
the metallic installation and electrical system inside a building
complex. This consists of:
• Lightning protection potential equalisation
• Shielding
• Use of overvoltage protective devices.
Further information on cabling and shielding is provided in the
following manuals:
• AWB27-1287 ”EMC Design Guide for Automation Systems”.
• TB27-001-GB ”The Electromagnetic Compatibility of
Automation Systems”.
• TB27-022-GB ”The Electromagnetic Compatibility (EMC) of
Machines and Plants”.
Figure 7: Arrangement in the control cabinet
a Gap > 50 mm
b Gap > 75 mm from active elements
c Cable duct
d UPS unit
h
Keep heavy current cables, control cables and signal
cables as far apart from each other as possible. This will
prevent capacitive and inductive interference. If separate
cable routing is not possible, the interference cable must
be shielded.
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Switched inductive loads should always be suppressed.
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