Troubleshooting; Valid Current Loop Outputs; Symptoms And Solutions - K-TEK MT5000 Installation & Operation Manua

5.0 Troubleshooting

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 an indication of defective electronics or improper wiring, disconnect the power supply immediately to
avoid further damage to the MT5000.

5.1 Valid Current Loop Outputs

If the top board jumper is set to HI ALARM a loss of signal, a problem with the configuration
21.00 mA
or a malfunction will cause the output to be set to the alarm condition of 21.00mA
When the level increases above the 20.0 mA point the output will continue up to 20.6 mA and
20.58 mA
then latch until the level returns below the 20.6 mA level.
4.0 mA to 20.0 mA Normal output range
When the level decreases below the 4.0 mA point the output will continue down to 3.8 mA
3.85 mA
and then latch until the level returns above the 3.8 mA level.
If the top board jumper is set to LOW ALARM a loss of signal, problem with the configuration,
3.61 mA
or a malfunction will cause the output to be set to the alarm condition of 3.61mA

5.2 Symptoms and Solutions

Symptom
Output spiking high
Output too low
No display and no mA Output
No display with mA Output
Actual mA Output does not match
displayed Value
Unit worked until new IS barrier was
installed
Upon power up current output drops to
4mA before reading correct level
MT5000-0200-1 Rev f (10-2010) DCN0528
Possible Cause

Blanking area too short

Threshold voltage too high

Inadequate supply voltage

Current drain in wiring

Inadequate supply voltage

Electronics failure

Electronics failure

Improper DAC Trim

Shorted RFI Filters in terminal
strip

Barrier does not meet
requirements for the transmitter

Normal Operation
Solution

Verify proper Nozzle Length in BASIC
SETUP menu. (SECTION 4.3.5)

From the WAVEFORM AT COUPLER dis-
play extend the Blanking (BLK) past ob-
structions. (Section 4.6.1)

From the WAVEFORM display readjust the
LTV for the return signal. (Section 4.6.1)

Check Power Supply Voltage

Check Wiring for Ground Faults or Water in
Conduit

Check Power Supply Voltage

Check Wiring Connections to Transmitter
and Power Supply

Replace Electronics Module (Section 5.3)

Replace Electronics Module (Section 5.3)

Perform DAC Trim (Section 4.5.7)

Replace Terminal Strip

Verify Barrier Specifications to Match
ELE1014

Normal Operation
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