General technical data
1-12
Hardware - SIMADYN D
Edition 08.2005
Nominal values for permissible ambient temperatures of a cabinet with
the dimensions 600 mm
×
600 mm
×
2200 mm as a function of the
installed power loss can be taken from the figure above.
1. Open unit / wall
2. Cabinet with air slots
3. Closed cabinet with self-convection and forced air circulation using an
equipment fan
4. Closed cabinet with heat exchanger
If a cabinet is ventilated from below via the cable duct, more favorable
conditions are obtained as illustrated under 2).
For mounting types 1) and 2), it is assumed, that there is a minimum of
1m clearance between the cabinet and the ceiling.
1.1.16 Power supply
The following instructions to suppress noise in systems/plants must be
observed so that noise voltage spikes on the supply cable in the cabinet
are eliminated.
Suppressing supply cables
When the equipment is supplied from a 115/230 V supply, a line filter
must be installed in the cable as close as possible to where the cable
enters the cabinet (e. g. 250 V AC/ 10 A). The ground connection of the
line filter must be connected to the central grounding point in the cabinet
through the shortest possible path.
Discharge capacitors for DC supplies
If a cabinet is connected to a central 24 V supply, noise voltages can be
coupled-into the cabinet via the supply cable.
We recommend that noise suppression capacitors are installed where
the 24 V supply cable enters the cabinet. These capacitors can be
mounted on the cabinet ground or the screen rail.
If several 24 V power supplies are used in networked systems, then the
grounds of the power supplies must be connected with on another via the
grounding / potential bonding rail and connected to the subrack.
In order to diminish the effects of noise and disturbances, a line filter
should be provided for the 24V DC power supply of the digital inputs and
outputs ( e.g. line filter SIFI-B, Order No. B84112-B-.... from Epcos / line
filter NF 1-1 from Phönix Contact ). This should be located as close as
possible to the terminal block. The shield connection of the line filter must
be connected to ground through the shortest possible distance.
!
WARNING
Protective separation in accordance with VDE 0160 must be
guaranteed for all power supply units which are used to supply
SIMADYN D units and modules.
Measures against
noise voltages
Aotewell Ltd
www.aotewell.com
Industry Automation
HongKong|UK|China
+86-755-8660-6182