Chapter Two: Installation Electrical Information
31
How To Set the Line Voltage
The Line Voltage Selector configures the 247 unit to accept either 115 or 230 VAC input
voltage. The value of the selected line voltage is visible through the window in the cover when it
is closed.
Caution
The Line Voltage Selector on the 247 unit must be set to the proper
input voltage
before
you connect the power cord and turn on the
power. Otherwise, the unit will be severely damaged.
To change the line voltage:
1. Ensure that the power cord and all interface cables are disconnected from the 247
instrument.
2. Use a blunt instrument, such as a flat head screw driver, under the left hand side of the
cover to the line voltage selector, and firmly pull towards you to unsnap the cover.
The cover is attached firmly, so it requires a strong force from the screwdriver to loosen
it. The cover will flip open, from left to right, to expose the line voltage selector drum.
3. Grasp the line voltage selector drum carefully and pull it out of its position.
4. Turn the selector drum to the appropriate line voltage.
5. Replace the line voltage selector drum into the 247 unit so that the voltage value can be
read from bottom to top.
The top and bottom of the voltage selector drum are shaped differently so that the drum
will only fit into position in the correct orientation. The value of the selected line
voltage is visible through the window in the cover when it is closed.
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