Emerson MICRO MOTION 2700 Instalační manuál stáhnout pdf (Strana 149)

Transmitter Configuration and Use: Series 1000 and 2000 Transmitters 139

Troubleshooting continued

Troubleshooting DiagramsDefaultsCompensation

7. There should be no open circuits, i.e., no infinite resistance readings. The LPO and RPO

readings should be the same or very close (± 5 ohms).

8. Using the DMM, check between each pin and the sensor case. With the DMM set to its highest

range, there should be infinite resistance on each lead. If there is any resistance at all, there is a

short to case. See Table 10-14 for possible causes and solutions.

9. Test terminal pairs as follows:

a. Drive + against all other terminals except Drive –

b. Drive – against all other terminals except Drive +

c. Left pickoff + against all other terminals except Left pickoff –

d. Left pickoff – against all other terminals except Left pickoff +

e. Right pickoff + against all other terminals except Right pickoff –

f. Right pickoff – against all other terminals except Right pickoff +

g. RTD + against all other terminals except LLC + and RTD/LLC

h. LLC + against all other terminals except RTD + and RTD/LLC

i. RTD/LLC against all other terminals except LLC + and RTD +

Note: D600 sensors and CMF400 sensors with booster amplifiers have different terminal pairs.

Contact Micro Motion for assistance (see Section 10.3).

There should be infinite resistance for each pair. If there is any resistance at all, there is a short

between terminals. See Table 10-14 for possible causes and solutions.

10. If the problem is not resolved, contact Micro Motion (see Section 10.3).

To return to normal operation:

1. Align the three guide pins on the bottom of the core processor with the corresponding holes in

the base of the core processor housing.

2. Carefully mount the core processor on the pins, taking care not to bend any pins.

3. Tighten the captive screw to 6 to 8 in-lbs (0,7 to 0,9 N-m) of torque.

4. If you have a 4-wire remote installation, replace the core processor lid.

5. If you have an integral installation:

a. Gently lower the transmitter onto the base, inserting the cap screws into the slots. Do not

pinch or stress the wires.

b. Rotate the transmitter clockwise so that the cap screws are in the locked position.

c. Tighten the cap screws, torquing to 20 to 30 in-lbs (2,3 to 3,4 N-m).

Note: When reassembling the flowmeter components, be sure to grease all O-rings.

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Emerson MICRO MOTION 2700 Instalační manuál Strana 149