Chapter Three: Overview Underside Control
43
Underside Control
Line Voltage Selector Switch
The Line Voltage Selector Switch, located on the underside of the 246 unit, configures the unit to
accept either 115 or 230 VAC input voltage. The value of the selected line voltage is visible in
the panel cutout. Refer to
Line Voltage
, page 32, for more information.
Caution
The Line Voltage Selector switch must be set to the proper input
voltage
before
you connect the AC line cord. Otherwise, the unit will
be severely damaged.
Side Panel Control
Decimal Point Selector Dipswitches
This 4-position dipswitch, located inside the unit on the edge of the Main PC board, sets the
decimal point position for the Digital Panel Meter. The dipswitch is accessible through the vent
holes in the side of the unit (refer to Figure 3, page 24).
The position of the decimal point is determined by the full scale range of the MFC in use. A 100
sccm mass flow controller requires the decimal point to be positioned as “100.0” (display at full
rated flow).
Refer to Table 9, page 45, for a list of the correct displays at full scale for various range MFCs.
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