Omega Vehicle Security OMP-MODL manual Chassis Ground terminals

2... OMP-MODL System Base

INTERNAL CJC SENSING APPLICATIONS:

For OMP-MODL applications with thermocouple inputs connected directly to the MLAD-1 or any installed MLIM-1 Analog Input modules, a wire jumper must be installed across terminals 13 and 14 (marked INT for internal). The OMP-MODL is shipped from the factory with this jumper installed.

NOTE: If thermocouples are connected to the OMP- MODL on any channel, a wire jumper must be installed across the CJC terminal strip terminals marked INT or erroneous readings will occur..

EXTERNAL CJC SENSING APPLICATIONS:

If thermocouples are not being directly connected to the TSA (ie CJC is not required), this CJC sensor channel can be used to measure temperatures (or limited range resistance) outside of the enclosure. A 10 Kohm thermistor (with the specified resistance curve) or a resistance type sensor can be connected across the terminals marked EXT on the CJC terminal strip. Refer to the CJC Icon in Appendix A for additional details.

For external sensing applications, copper lug potted thermistors with 10’ leads are available from Omega Engineering.

Chassis Ground (terminals 16)

A single terminal is provided on the MLAD-1 which connects to the internal Chassis Ground circuit within the logger. In installations where sensor wiring utilizes a Shield conductor connection to I/O module terminal strips (eg in many MLIM-1 applications) a single conductor should be connected from this terminal to a good earth ground to complete the shielding circuit.

General Purpose Digital Input (terminals 17 & 18)

Integral to the MLAD-1 is a single digital input channel that can be configured under HyperNet as an Event or Counter input. The GPDI input signal (either a contact closure or 0 to 15VDC max driven signal) is applied across the two terminals observing polarity.

The operation of the GPDI is configured during construction of the Program Net within HyperNet. Programming details and applications are described in the Master Icon Reference in Appendix A.

Using the OMP-MODL 2-13