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2.7 TEMPERATURE ALARM RELAY
Refer to the TB3 terminal strip in figure 6 for wiring the alarm relay dry contact. Connect devices to this
form C, (SPDT) relay to monitor the set point of any alarming RTD sensor. This relay is common to the
four channels of the monitor. The alarm relay will change state when a temperature enters the adminis-
trator defined temperature set point. The alarm relay functions with alarms on rising or falling.
NOTE: The monitor comes with all RTD channels disabled to alleviate possible alarms when the monitor
is first powered up.
2.8 POWER CONNECTION
Depending on the monitor power supply, connect the power requirement to the monitor terminal TB2 as
indicated in figure 6. Verify on the product ID label the correct power source prior to applying power to
the monitor. After all hardware devices have been mounted and connected together, power may be ap-
plied to the monitor.
2.9 INTERNAL COMPONENT BOARD DESCRIPTIONS
The three boards listed below are installed in the monitor and are not a component to be repaired by
unauthorized personnel. For repair, the monitor must be sent to the distributor where it was purchased.
2.10 PROCESSOR BOARD
This board incorporates the microprocessor, memory, display and all necessary components to allow
the process function of the monitor.
2.11 POWER SUPPLY BOARD
Power requirements for the monitor are provided by the power supply board. The input of the power
supply is transient protected from surges. The monitor power input is fuse protected and identified on
the circuit board. This fuse, (F1) is a 5mm, 1A Slo-blo. Refer to the monitor identification label to verify
the power supply voltage rating.
2.12 REAR TERMINAL BOARD
FIGURE 2
For convenient access, all con-
nections to the monitor are pro-
vided by this connector assem-
bly located at the rear at the
monitor. The connectors can
accommodate from 24 to 12
gage twisted conductors. The
system fault and alarm relay is
located on this board as well.
Refer to figure 6 for RTD, relay
and power connections.