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MT2000-0200-1 Rev f (10-2007)
DCN0160 19
5. TROUBLESHOOTING INFORMATION
Use a milliamp (mA) meter to measure the output current. When power is applied the output will go to 4.00 mA for
at least one (1) second and then to either the measured level or an alarm condition output. If this does not happen
the transmitter may not be receiving enough power or the main electronic is defective. Excessive current above
21.00 mA is also an indication of improper power up or defective electronics.
5.1 Valid Current Loop Outputs
Output spiking up or down will usually result from improper THV or BLK settings. Refer to the initial setup section for
details. If a module fails to communicate, verify from the model number that the particular communication option is
included.
Note: Signal can be observed using an oscilloscope. Refer to Appendix F for setup procedure.
21.0 mA If the top board jumper is set to HI ALARM a loss of signal, a
problem with the configuration or a malfunction will cause the
output to be set to the alarm condition of 21.0 mA
20.6 mA When the level increases above the 20.0 mA point the output
will continue up to 20.6 mA and then latch until the level returns
below the 20.6 mA level.
4.0 mA to 20.0 mA Normal output range between 3.8 and 20.6 mA
3.8 mA / (4.0 mA) When the level decreases below the 4.0 mA point the output will
continue down to 3.8 mA and then latch until the level returns
above the 3.8 mA level. [If LRS (Low Range Saturation) is set
for 4.0 mA, that will be the lowest output, regardless of actual
level.]
3.6 mA If the top board jumper is set to LO ALARM a loss of signal,
problem with the configuration, or a malfunction will cause the
output to be set to the alarm condition of 3.6 mA
SYMPTOM ACTION
Output spiking high or raw counts
jumping low
Extend the Blanking (BLK) in increments of 4
Lower the Threshold
Output spiking low or raw counts
jumping high
Raise the Threshold
Introduce a parallel ground plane
Output mA erratic
Check BLK, THV, GS (section 4.4.2 )
Output greater than 21 mA
Check for shorts between electronics (+ and – on back) and ground
(case)
Change the electronics module
Power unit with an isolated supply
Output too low
Check for proper supply voltage
Check terminal strip for leakage to cage.
Raw Counts and Output remain
constant but in measuring range
Lower the Threshold
Check the probe for obstructions
(continued on next page)
5.2 Possible Symptoms