Marathon Computer UNIPRO V3.5 - Manual (Page 7)

Marathon Monitors Inc
.
Unipro 3.5 Process Control 1 Aug. 1997
On subsequent removals and installations the rear
panel can be removed (4 screws) and the wiring
does not have to be disturbed.
Warning
All connections, rear panel installations and removals; plus
triac board installations and removals must be done with
power removed from TBA and TBB. All PC boards should
only be removed or installed with power off via the switch
mounted on the triac board. Otherwise, serious personal
and/or equipment damage can occur.
Thermocouples and Other Signal Wires
The wiring used to connect the signal wires to the instrument
should be run in a conduit, separate from any AC lines in the area.
This provides noise immunity and physical protection.
Thermocouples should be wired with the appropriate alloy
extension wire with no termination other than at the instrument. As
with all cold-junction compensating instruments, extreme care
should be used when an existing thermocouple is to be used for
both the Controller and another instrument at the same time.
Control Devices
The UNIPRO provides simple ON/OFF as well as Proportional
control through its two contact closure Control Outputs (TBA-7,
TBB-7, TBA-8, and TBB-8) and two Analog Outputs (TBD-13
through TBD-16). Refer to the Section on Control Modes for
more details on the outputs. This allows control through simple
ON/OFF devices or through Proportional control methods.
SIMPLE ON/OFF CONTROL: Set Control Mode for
ON/OFF Control. This provides contact closure at Control Output
#1 to control absolute heat application/removal for such devices as
heating elements, etc.