Siemens TC12 Installation, Commissioning And Maintenance Handbook page 172

The above conditions are automatically checked when the appropriate plug/socket
is inserted because the connectors incorporate links that activate the inputs to the
Connection Check Logic.
If any condition proves faulty, operation of the rest of the circuit is inhibited and the
Connection Fault LED is lit.
5.2.1.5 Mains Supply and Mains Voltage Range Selection
The mains supply is connected via a cable through the front panel of the OTS,
which is wired for operation from a 240 V 50 Hz supply. A conventional 13 A plug
with 2 A fuse is fitted to the power supply lead for connection to the mains. A neon
lamp gives an indication of mains ON.
The outstation test set uses a Coutant Lambda HSB-1.7, 12 V 1.7 A power supply.
This is supplied for use with a 240 V AC mains supply. It is possible to select any
of the following mains supply voltages, 100/120/220/230/240 V AC +10%,-13%, all
47 Hz to 63 Hz.
To change the voltage range the power supply needs to be accessed. Remove
four screws, two from the far right and two from the far left of the test set front
panel. Lift out the front panel with attached electronics and power supply. Rest the
front panel face down. The transformer of the Coutant Lambda power supply can
now be seen. Follow the manufacturer's instructions for setting the different
voltage ranges. The instructions are displayed on a label on the inside of the
power supply side panel. Changing the voltage range involves moving the
incoming mains connections to specified transformer taps and/or shorting together
other transformer taps as specified.
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook
Page 162 Issue 10