Instruction manual

RFT9739 Rack-Mount Transmitter Instruction Manual 69
Output Wiring Startup TroubleshootingBefore You Begin Getting Started Mounting
Power-Supply and
Sensor Wiring
7 Troubleshooting
7.1 General guidelines
Troubleshooting a Micro Motion flowmeter is performed in two parts:
1. Tests of wiring integrity
2. Observation of the transmitter's diagnostic tools, which include
diagnostic messages and fault output levels.
Follow these general guidelines when troubleshooting a Micro Motion
flowmeter:
• Before beginning the diagnostic process, become familiar with this
instruction manual and with the instruction manual for the sensor.
• While troubleshooting a problem, leave the sensor in place, if possible.
Problems can result from the specific environment in which the sensor
operates.
• Check all signals under both flow and no-flow conditions. This
procedure will minimize the possibility of overlooking some causes or
symptoms.
7.2 Transmitter diagnostic
tools
In some situations, troubleshooting requires use of the transmitter's
diagnostic tools, which include fault output levels and diagnostic
messages.
Fault outputs
The RFT9739 has downscale and upscale fault outputs. (See "Milliamp
output scaling", page 9.) Fault output levels are listed in
Table 7-1
.
CAUTION
During troubleshooting, the transmitter could produce
inaccurate flow signals.
Set control devices for manual operation while
troubleshooting the flowmeter.
Table 7-1. Fault output levels
Output Operating condition Downscale Upscale
0-20 mA Alarm 0 mA 22 mA
EPROM, RAM, or RTI error; transmitter failure 0 mA 24 mA
4-20 mA Alarm 2 mA 22 mA
EPROM, RAM, or RTI error; transmitter failure 0 mA 24 mA
Frequency/pulse Alarm 0 Hz 15 kHz
EPROM, RAM, or RTI error; transmitter failure 0 Hz 19 kHz