Installation and EMC guidelines
1.14 Power supply
SIMATIC TDC hardware
30 System Manual, 08/2017, A5E01114865-AL
The maximum air intake temperature on the SIMATIC TDC may not be exceeded. The
following limits are valid, depending on the "shutdown mode" switch setting.
Maximum air intake temperature up to 2000 m above
sea level
ONE / ON
60° Centigrade
TWO / OFF
Shutdown on failure of two fans
35° Centigrade
Power supply
Measures against disturbance voltages
The following notes related to the EMI/EMC measures to take for systems/plants should be
observed in order to avoid disturbance peaks on the supply cables in the cabinet:
Interference suppression on mains
The power supply of the rack already has a line filter with sufficient attenuation (refer to
"Manufacturers declaration").
For more demanding applications, you can install an additional line filter (e.g. 250 V AC /
10 A) or overvoltage arrester in the mains line, as close as possible to the cable entry on the
cabinet. Ground of the line filter/arrester must be wired to the equipotential busbar of the
cabinet using the shortest possible conductor length.
To attenuate external interference, a line filter must be provided for the 24 V power supply of
the digital I/O (e.g. SIFI-B line filter, Order No. B84112-B-.... from Epcos/NF 1-1 line filter of
Phoenix Contact). This filter should be installed as close as possible to the terminal block.
The shield connections of the line filter must be bonded to ground across the shortest
possible distance.
The 24 V power supply must also be equipped with lightning/overvoltage protection.
For more information, refer to the installation manual "SIMATIC Automation Systems
S7-400, Hardware and Installation
(http://support.automation.siemens.com/WW/view/de/1117849/0/en)".
Safe electrical isolation to IEC 61131-2 IEC 61131-2 (11.1.2.1.3) must be ensured for all
power supply units operated on SIMATIC TDC devices and modules.
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