RKI Instruments Pioneer 4W - Manual (Page 9)

Pioneer Gas Monitor Operator’s Manual Description • 5
Fuses
The Pioneer includes up to two AC fuses and one DC fuse.
AC fuse(s)
Two AC fuse holders are above the power switch (near the upper left corner of the main
circuit board). The AC fuse(s) protects the AC line circuitry from short circuit or overload.
For a 115 VAC power source, a 1-amp fuse is installed in the top fuse holder. For a 220
VAC power source, two 1/2-amp fuses are installed in the top and bottom fuse holders.
NOTE: The standard configuration is for 115 VAC operation. 220 VAC operation is an
optional configuration and must be specified when ordering.
DC fuse
The DC fuse is to the right of the fourth analyzer card socket (near the lower right corner
of the main circuit board). The DC fuse protects the DC line circuitry from short circuit or
overload. The DC fuse is rated at 3 amps.
Power Switch
The power switch is directly below the AC fuse. The power switch turns the incoming
power source on and off at the Pioneer. When the switch is up, the power switch is on. A
round polycarbonate guard is mounted to the switch bushing to protect against accidental
contact with live parts on the circuit board near the switch.
Transformer
The transformer is to the right of the AC fuse (under the display screen). The transformer
receives the incoming AC voltage and converts it to a nominal DC voltage.
Ground Stud
The ground stud extends from the bottom left corner of the main circuit board. Remove
the nut to install a ground wire terminated with a #10 lug, then replace the nut.
CAUTION: Do not use the GND terminal to connect the ground wire. Use the ground stud
described above.
Terminal Strips
The Pioneer includes four terminal strips for external wiring connections. See Chapter 3,
Installation and Start Up, for wiring procedures.
NOTE: The analyzer card also includes three terminal strips. They are described at the
end of this chapter.
AC terminal strip
The 3-point AC terminal strip is below and to the right of the power switch. You connect
the incoming AC power source to the AC terminal strip. The AC terminal strip is labeled
TB1 on the main circuit board. A polycarbonate terminal cover protects against
accidental contact with the live terminal screws once power to the unit is turned on.