Agilent Technologies Turbo-V 550 Notice De Mode D'emploi page 227

If a change in line voltage operation is desired, proceed as follows:
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Turbo-V 550 Controller User Manual / 87-900-873-01 (G)
Disconnect the power cord from the controller socket.
On power entry module, check back door for voltage selector set.
Using a small screw driver, pull out the voltage selector and
fuses.
Select the operating voltage then firmly insert the voltage selector
and fuses in place.
Check voltage selector window for correct set and connect power
cord.
Instructions for Use
Preparation for Installation
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