Troubleshooting

Table 11-13Coils and test terminal pairs

 

Test terminal pair

 

 

 

Coil

Colors

Numbers

 

 

 

Drive coil

Brown to red

3 — 4

 

 

 

Left pickoff coil (LPO)

Green to white

5 — 6

 

 

 

Right pickoff coil (RPO)

Blue to gray

7 — 8

 

 

 

Resistance temperature detector (RTD)

Yellow to violet

1 — 2

 

 

 

Lead length compensator (LLC) (all sensors except CMF400 I.S. and T-Series)

Yellow to orange

1 — 9

Composite RTD (T-Series sensors only)

 

 

Fixed resistor (CMF400 I.S. sensors only)

 

 

 

 

 

5.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 ). If there are any unusual readings, repeat the coil resistance tests at the sensor junction box to eliminate the possibility of faulty cable. The readings for each coil pair should match at both ends.

6.Leave the core processor terminal blocks disconnected. At the sensor, remove the lid of the junction box and test each sensor terminal for a short to case by placing one DMM lead on the terminal and the other lead on 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.

7.At the sensor, test terminal pairs as follows:

a.Brown against all other terminals except Red

b.Red against all other terminals except Brown

c.Green against all other terminals except White

d.White against all other terminals except Green

e.Blue against all other terminals except Gray

f.Gray against all other terminals except Blue

g.Orange against all other terminals except Yellow and Violet

h.Yellow against all other terminals except Orange and Violet

i.Violet against all other terminals except Yellow and Orange

Note: D600 sensors and CMF400 sensors with booster amplifiers have different terminal pairs. Contact Micro Motion for assistance (see Section 1.8).

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

8.See Table 11-14 for possible causes and solutions.

9.If the problem is not resolved, contact Micro Motion (see Section 1.8).

10.To return to normal operation:

a.Plug the terminal blocks into the terminal board.

b.Replace the end-cap on the core processor housing.

c.Replace the lid on the sensor junction box.

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

Compensation

Measurement Performance

Troubleshooting

Defaults

Configuration and Use Manual

111

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Emerson Process Management 1500 manual 13Coils and test terminal pairs, Test terminal pair, Coil Colors Numbers

1500 specifications

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