Omega-vehicle-security OMP-MODL Manuel d'utilisateur télécharger pdf (Page 48)

3... INTERFACE MODULES

USING THE OMP-MODL3-24

Commonly, this fuse is blown during installation of 4-

20mA current channels where the power supply powering

the 4-20mA transmitter is accidently shorted directly

across the logger input channel. To avoid this

inconvenience, always check wiring prior to powering up

system power supplies.

MLIM-1; THERMOCOUPLE APPLICATION

Thermocouple Connection:

To utilize an MLIM-1 channel as a thermocouple input, configure that

channel’s Interface Module Configuration Switch per Table 3... -4. Channels

configured as thermocouple inputs utilize three terminal strip connections

per input; Positive lead, Negative lead, and Shield.

Connect the thermocouple positive and negative (red in USA) leads to the

correct pair of terminals on the module terminal strip. Refer to Chapter 7 for

steps to generate a Terminal Strip Wiring printout for use in making field

wiring connections.

Polarity is critical.

Shielded thermocouple wire is recommended in electrically noisy

environments for optimum signal protection. If shielded wire is used, a

ground wire should be run from the MLAD-1 module Chassis Ground

(terminal strip connection #16) to an earth ground connection to conduct

away noise picked up by the thermocouple shield (Figure 2-8). Only one

ground wire is required as all of the Shield terminal strip connections are

interconnected within the logger and routed to the MLAD-1 Chassis Ground

terminal.

NOTE: Do not ground the shield wire at the sensor end away from the OMP-

MODL.

Thermo-

couple Icon

1 2 3 4 5 6

Terminal Strip

Thermocouple

Shield

Lo (Red)

ML055

Figure 3... -14: Thermocouple (and optional Shield) terminal strip connection

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Omega-vehicle-security OMP-MODL Manuel d'utilisateur Page 48