Marathon Computer V3.5 user manual Marathon Monitors Inc

Marathon Monitors Inc.

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.

Unipro 3.5 Process Control 1 Aug. 1997