Siemens Plant Central Clock TC100 - Manual (Page 35)

Connection
6-3 © Siemens AG 2010 All Rights Reserved
SICLOCK ® TC100 Operating Instructions
6.2 Connecting the power supply
The power supply is connected to terminal strip X1, and muss pass through a
slow-blow 1A fuse. The device does not have a power switch.
Figure 6-1 Connecting the power supply
Note before connecting the device
Functional check
After switching on, the POWER LED must light up green.
Warning
The device may only be connected to 24 VDC power supply systems which meet
the requirements of a safe extra-low voltage with protective separation (SELV); a
protective conductor must also be connected. The conductors must be able to
withstand the short-circuit current of the 24 VDC power supply, so that a short cir-
cuit will not damage the cable. Only cables with a cross-section between a mini-
mum of 0.25 mm
2 (AWG23) and a maximum of 2.50 mm 2 (AWG13) may be
connected.
Notice
The 24 VDC power supply must match the input specification of the device
Technical data (Chapter 13).
Caution
Ensure that the functional grounding is connected correctly.
It is essential to ensure the correct polarity with direct current.