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Troubleshooting
Figure 12-3
Sensor pins – Enhanced core processor
RTD +
Left pickoff –
(1) Functions as fixed resistor for the following sensors: F300, H300, F025A, F050A, F100A, CMF400 I.S., CMFS. Functions
as composite RTD for T-Series sensors. For all other sensors, functions as lead length compensator (LLC).
8. 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).
9. 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 12-14 for possible causes and solutions.
10. 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 12.3).
There should be infinite resistance for each pair. If there is any resistance at all, there is a short
between terminals. See Table 12-14 for possible causes and solutions.
11. If the problem is not resolved, contact Micro Motion (see Section 12.3).
To return to normal operation:
160
Drive –
RTD –
Left pickoff +
Drive +
LLC / Composite RTD /
Fixed resistor
Right pickoff +
Right pickoff –
Micro Motion Series 1000 and Series 2000 Transmitters
(1)
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