RKI Instruments Beacon 110 Rig Monitor - Manual (Page 13)

Beacon 110 Rig Monitor Operator’s Manual 8
• Detector/Transmitter Terminal Strips. Three adjacent terminal strips are located along the
right side of the main circuit board above the controller terminal strip (see Figure ). These three
terminal strips labelled LEL, Oxy, and AMP facilitate wiring connections to a detector or a 4 -
20 mA transmitter. The Beacon 110 Rig Monitor only uses the top terminal strip, labelled
AMP, for wiring to the H
2
S detector. The LEL and Oxy terminal strips are not used.
Ground Stud
The threaded ground stud is used for making connections to earth ground. It is connected through
the main PCB to the (earth) terminal on the 12 VDC In terminal strip. A kep nut on the stud
may be removed for installation of one or more lugs to make wiring connections. The detector
cable shield’s drain wire is connected to the stud.
Relays
The Rig Monitor includes three alarm relays located above the alarm terminal strip. They are from
left to right Fail, Alarm 1, and Alarm 2. The relays are form C, single-pole, double-throw (SPDT)
and rated for 10 amps at 250 VAC (resistive). The Rig Monitor uses the Alarm 1 relay to control the
factory installed strobe/horn. Only the Fail and Alarm 2 relays are available for customer use.
NOTE: You can select normally energized (N.EN) or normally de-energized (N.DE-EN)
settings for the alarm 1 and alarm 2 relays. See “Chapter 5: Configuration Mode” on
page 22.
The fail relay is factory set as normally energized and is not user adjustable.
DC Circuit Protection
Two DC fuses are used in the Rig Monitor. The two fuses are located on the left side of the main
PCB, above the 12 VDC power terminal strip. They cut off the incoming 12 VDC power in the
event of a short circuit or other electrical fault which causes a high current draw in the Rig Monitor.
They are housed in vertical fuse holders and are held in the holder by a quarter turn cover. They are
labelled as F1 (left fuse) and F2 (right fuse) on the PCB silk-screen and are rated at 3 A, 250 V.
Power Switch
The power switch is located to the right of the power supply and above the relays (see Figure ). The
power switch turns the incoming 12 VDC power source on and off at the Rig Monitor. When the
switch is up, the power switch is on.
Control PCB
The LCD display and control buttons are located on the control PCB. It is installed on the main
PCB with three standoffs. The control PCB is connected to the main PCB with the display cable
which is a ribbon cable terminated with 20 position rectangular connectors on each end. The
display cable connects to the control PCB on the back of the top edge and to the main PCB directly
below the control PCB.