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SHUTDOWN MODE
Using the SHUTDOWN MODE dip switch on the front panel of the rack, you can select
whether to shut down the rack immediately on failure of the first fan, or not until an additional
fan failure.
Shutdown mode
ONE
TWO
Note
In the SHUTDOWN MODE, the internal output voltages of the rack are switched off. External
voltages connected to the module input must be switched off simultaneously (refer to chapter
"Input of external voltages").
1.1.13
Power supply
1.1.13.1
Overview
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:
1.1.13.2
Interference suppression on mains
The rack power supply is equipped with a line filter that provides an appropriate shielding
effect (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.
SIMATIC TDC hardware
System Manual, 12/2013, A5E01114865-07
Shutdown is initiated upon the failure of one fan
Shutdown is initiated upon the failure of at least two fans
General technical specifications
1.1 Installation and EMC guidelines
29
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