Control And Display Elements - Siemens SIMATIC TDC System Manual

3.1.3

Control and display elements

X1
3 signaling relays, 230 V AC floating potential (3 x 2 contacts)
Note
Mixed assignment
Contacts consisting of combinations of safety extra-low voltage and hazardous voltages are
not permitted.
SHUTDOWN MODE
A system shutdown mode can be set in accordance with the switch position S1.1 (in the
battery compartment) as response to the failure of one or two fans.
● OFF = Shutdown on failure of two fans (SHUTDOWN MODE LED = on)
● ON = Shutdown on failure of one fan (SHUTDOWN MODE LED = flashes)
Figure 3-2
LED
The four LEDs signal the operating state of the rack.
RESET
You can restart all modules by pressing the submerged pushbutton (rack RESET).
BATTERY
Backup battery compartment (1 x AA lithium battery)
X2
Line voltage connection
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
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Front view of the fan tray
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