Instruction manual

70 RFT9739 Field-Mount Transmitter Instruction Manual
Troubleshooting
continued
Table 7-4. Using overrange and sensor error messages
Table 7-5. Using slug flow and output saturated messages
Instructions
1. Turn off power to the transmitter.
2. Unplug terminal blocks from transmitter electronics module to check circuits
Message Other symptoms Causes Corrective actions
Drive Overrng or
Input Overrange
• Transmitter produces fault outputs
• At the transmitter, DMM indicates open or
short circuit from red wire to brown wire
• At the sensor, DMM indicates open or short
circuit from red wire to brown wire
• Flow rate outside
sensor limit
• Faulty cable
• Open or short drive coil
in sensor
• Fill sensor with process
fluid
• Bring flow rate within
sensor limit
• Monitor flow rate
• If open or short at
transmitter, reconnect
wiring or repair cable
• If open or short at
sensor, return sensor
to Micro Motion
• Transmitter produces fault outputs
• At the transmitter, DMM indicates open or
short circuit from green wire to white wire
• At the sensor, DMM indicates open or short
circuit from green wire to white wire
• Flow rate outside
sensor limit
• Faulty cable
• Open or short left
pickoff in sensor
Sensor Error • Transmitter produces fault outputs
• At the transmitter, DMM indicates open or
short circuit from blue wire to gray wire
• At the sensor, DMM indicates open or short
circuit from blue wire to gray wire
• Faulty cable
• Open or short right
pickoff in sensor
• If open or short at
transmitter, reconnect
wiring or repair cable
• If open or short at
sensor, return sensor
to Micro Motion
Transmitter produces fault outputs • Moisture in sensor
case
• Replace conduit and/or
conduit seals
• Repair cable
• Return sensor to Micro
Motion
Drive Overrng or
Dens Overrng
Transmitter produces fault outputs • Inappropriate density
factors
• Process density
> 5.0000 g/cc
• Severely erratic or
complete cessation of
flow tube vibration due
to gas slugs or solids in
process fluid
• Plugged flow tube
• Calibrate for density
• Correct density factors
• Monitor density
• Bring density within
sensor limit
• Purge flow tubes with
steam, water, or
purging chemical
Temp Overrange • Transmitter produces fault outputs
• At the transmitter, DMM indicates open or
short circuit from yellow wire to orange wire
• At the sensor, DMM indicates open or short
circuit from yellow wire to orange wire
• Temperature outside
sensor limit
• Faulty cable
• Open or short lead
length compensator
• Bring temperature
within sensor limit
• Monitor temperature
• If open or short at
transmitter, reconnect
wiring or repair cable
• If open or short at
sensor, return sensor
to Micro Motion
• Transmitter produces fault outputs
• At the transmitter, DMM indicates open or
short circuit from violet wire to yellow wire
• At the sensor, DMM indicates open or short
circuit from violet wire to yellow wire
• Faulty cable
• Open or short RTD in
sensor
Message Condition Corrective action(s)
Slug flow • Gas slugs causing process density to go below low slug flow limit
• Solids causing process density to go above high slug flow limit
• Monitor density
• Enter new slug flow limits
• Enter new slug duration
Freq overrange Flow rate driving output from terminals 15 (FREQ+) and
16 (RETURN) to 0 or 15 kHz
• Change flow measurement units
• Rescale frequency/pulse output
• Reduce flow rate
mA 1 saturated Output from terminals 17 (PV+) and 18 (PV–) = 0, 3.8, or 20.5 mA • Change value of variable at 20 mA
• Alter fluid process
mA 2 saturated Output from terminals 19 (SV+) and 20 (SV–) = 0, 3.8, or 20.5 mA