Emerson Model 1700 User Manual
Milliamp output problems and recommended actions
(continued)
Table 10-6:
Problem
Possible causes
Recommended actions
Consistently incorrect
mA measurement
mA measurement
•
Loop problem
•
Output not trimmed correctly
•
Incorrect flow measurement unit config-
ured
ured
•
Incorrect process variable configured
•
LRV and URV are not set correctly
•
Check the mA output trim. See
•
Verify that the measurement units are con-
figured correctly for your application.
figured correctly for your application.
•
Verify the process variable assigned to the
mA output.
mA output.
•
Check the settings of Upper Range Value and
Lower Range Value
Lower Range Value
.
mA output correct at
lower current, but in-
correct at higher cur-
rent
lower current, but in-
correct at higher cur-
rent
•
mA loop resistance may be set too high
•
Verify that the mA output load resistance
is below maximum supported load (see
the installation manual for your transmit-
ter).
is below maximum supported load (see
the installation manual for your transmit-
ter).
10.7
Frequency output problems
Frequency output problems and recommended actions
Table 10-7:
Problem
Possible causes
Recommended actions
No frequency output
•
Stopped totalizer
•
Process condition below cutoff
•
Fault condition if fault action is set to in-
ternal zero or downscale
ternal zero or downscale
•
Slug flow
•
Flow in reverse direction from config-
ured flow direction parameter
ured flow direction parameter
•
Bad frequency receiving device
•
Output level not compatible with receiv-
ing device
ing device
•
Bad output circuit
•
Incorrect internal/external power con-
figuration
figuration
•
Incorrect pulse width configuration
•
Output not powered
•
Wiring problem
•
Verify that the process conditions are below
the low-flow cutoff. Reconfigure the low-flow
cutoff if necessary.
the low-flow cutoff. Reconfigure the low-flow
cutoff if necessary.
•
Check the Fault Action settings. See
.
•
Verify that the totalizers are not stopped. A
stopped totalizer will cause the frequency
output to be locked.
stopped totalizer will cause the frequency
output to be locked.
•
Check for slug flow. See
•
Check flow direction. See
.
•
Verify that the receiving device, and the wir-
ing between the transmitter and the receiv-
ing device.
ing between the transmitter and the receiv-
ing device.
•
Verify that the channel is wired and config-
ured as a frequency output.
ured as a frequency output.
•
Verify the power configuration for the fre-
quency output (internal vs. external).
quency output (internal vs. external).
•
.
•
.
Consistently incorrect
frequency measure-
ment
frequency measure-
ment
•
Output not scaled correctly
•
Incorrect flow measurement unit config-
ured
ured
•
Check the frequency output scaling. See
.
•
Verify that the measurement units are con-
figured correctly for your application.
figured correctly for your application.
Erratic frequency out-
put
put
•
Radio frequency interference (RFI) from
environment
environment
•
Check for radio frequency interference. See
.
Troubleshooting
Configuration and Use Manual
191