Troubleshooting System Problems - Magnetrol E3A Modulevel Installation And Operating Manual

3.3.1 Troubleshooting System Problems

Symptom
No loop current. Power supply not turned on. Turn on power.
Insufficient source voltage.
Improperly wired or
damaged wiring.
Defective electronics.
LEVEL, % OUTPUT and Basic configuration data is
LOOP values are all questionable.
inaccurate.
Transmitter does not Model incompatible with
track level. process liquid
Possible damage to unit.
Possible material buildup
Displacer, spring or stem
dragging on inside of
chamber, e-tube.
Level reading on display Invalid poll address.
is correct, but loop value
is stuck at 4 mA.
LEVEL, % OUTPUT and Liquid turbulence.
LOOP values fluctuate.
Power supply unstable.
Electrical interference (RFI).
HART device only: Most current Device
Handheld will only read Descriptors are not installed
Universal Commands in handheld.
Cannot set high level to Incorrect power supply.
20 mA
Excessive loop resistance
Loop current less than Liquid level less than 0%.
4 mA
Supply voltage out of limits
at transmitter.
4 mA output does not 4 mA may need to be
match display trimmed.
Loop current exceeds Liquid level greater than
20 mA 100%.
Supply voltage out of limits
at transmitter.
Wired incorrectly.
20 mA output does not 20 mA may need to be
match display trimmed.
Output jumps quickly Bent stem impeding smooth
over wide range core movement
Non-linear output. Excessive loop resistance.
Displacer hanging up.
Bent stem.
Possible material buildup
48-635 E3 Modulevel ® Displacer Level Transmitter
Problem
E3 requires a minimum of 11 VDC at the wiring board. Verify supply
voltage.
Check wiring and connections.
Replace PC board assembly or wiring board as required.
Verify Level Offset values.
If using factory calibration, verify that Process SG and Operating
Temperature values are accurate.
Verify/confirm that Model Parameters are accurate.
Confirm set points are as expected.
Verify model in use is appropriate for process liquid SG.
Check displacer, spring, stem and enclosing tube for damage.
Replace all damaged parts.
Check displacer, spring, stem, enclosing tube and displacer for
buildup of process material. Clean any fouled parts.
Verify proper and level installation (within 3 degrees of plumb in all
directions).
Set poll address to 0 if not using multi-drop.
Increase damping until output stabilizes or install stilling well.
Repair or replace power supply.
Consult factory for assistance.
Contact local HART service center for the latest DDs.
Check power supply.
Increase power supply voltage or decrease loop resistance
(max 620 ohms @ 24 VDC).
No action required.
Adjust power supply or reduce loop resistance.
Use Trim 4 mA to adjust output to match display.
No action required.
Adjust power supply or reduce loop resistance.
Check power supply (+) and (-) for reverse wiring.
Use Trim 20 mA to adjust output to match display.
Review Status History for Surge event. Inspect stem and replace if
damaged.
Increase power supply voltage or decrease loop resistance.
Verify proper and level installation (within 3 degrees of plumb in all
directions.)
Check stem. Replace if damaged.
Check displacer, spring, stem, enclosing tube and displacer for
buildup of process material. Clean any fouled parts.
Solution
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