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Troubleshooting
4. If you have an integral installation (Model 1700/2700 transmitters only):
a. Loosen the four cap screws that fasten the transmitter to the base (see Figure B-9).
b. Rotate the transmitter counter-clockwise so that the cap screws are in the unlocked
position.
c. Gently lift the transmitter straight up, disengaging it from the base.
Note: You may disconnect the 4-wire cable between the core processor and the transmitter, or leave it
connected.
5. If you have a standard core processor or an integral Model 1700/2700 – Loosen the captive
screw (2.5 mm) in the center of the core processor. Carefully remove the core processor from
the sensor by grasping it and lifting it straight up. Do not twist or rotate the core processor.
6. If you have an enhanced core processor – Loosen the two captive screws (2.5 mm) that hold
the core processor in the housing. Gently lift the core processor out of the housing, then
disconnect the sensor cable from the feedthrough pins. Do not damage the feedthrough pins.
If the core processor (feedthrough) pins are bent, broken, or damaged in any
way, the core processor will not operate.
To avoid damage to the core processor (feedthrough) pins:
•
Do not twist or rotate the core processor when lifting it.
•
When replacing the core processor (or sensor cable) on the pins, be sure to
align the guide pins and mount the core processor (or sensor cable) carefully.
7. Using a digital multimeter (DMM), check the pickoff coil resistances by placing the DMM
leads on the pin pairs. Refer to Figure 12-2 (standard core processor) or Figure 12-3 (enhanced
core processor) to identify the pins and pin pairs. Record the values.
Figure 12-2
Sensor pins – Standard core processor
LLC / Composite RTD /
(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).
Configuration and Use Manual
CAUTION
Right pickoff –
(1)
Fixed resistor
RTD –
RTD +
Right pickoff +
Left pickoff –
Left pickoff +
Drive –
Drive +
159
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