Rear Panel Controls Cha
ter Three: Overview
44
Decimal Point Selector Switches
These switches, one for each channel, set the decimal point for the Digital Panel Meter on the
front panel.
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).
Line Voltage Selector
The Line Voltage Selector configures the 247 unit to accept either 115 or 230 VAC input
voltage. The voltage selected is visible in the panel cutout. Refer to
How To Set the Line
Voltage,
page 31, for more information.
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.
Fuse
The fuse protects the internal circuitry of the 247 unit; both sides of the line are fused. The fuse
values are listed in Table 6, page 30.
Caution
Disconnect the power cord from the 247 unit
before
you replace the
fuse, to avoid any damage.
AC Line Cord
The AC Line Cord provides 115 or 230 VAC power to the 247 unit. For protective earthing,
plug the power cord into a properly grounded outlet.
Interface Connector J6 - Channels 1 to 4
This 25-pin male Type “D” connector provides the communications link to and from the unit,
including the connection to the scaled transducer outputs, the lines to turn the flow on and off,
and the (external) set point input lines which remotely set the flow rate of the MFCs.
Refer to Table 7, page 32, for the Interface Connector J6 pinout.
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