E3A-MA3A-H11 Datasheet, PDF (29/48 Pages) Magnetrol International, Inc. – Digital E3 Modulevel with HART® and PACTware™ Communications Liquid Level Displacer Transmitter

3.3.1 Troubleshooting System Problems
Symptom
Problem
Solution
No loop current.
Power supply not turned on. Turn on power.
Insufficient source voltage. E3 requires a minimum of 11 VDC at the wiring board. Verify supply
voltage.
Improperly wired or
damaged wiring.
Check wiring and connections.
Defective electronics.
Replace PC board assembly or wiring board as required.
LEVEL, % OUTPUT and Basic configuration data is
LOOP values are all
questionable.
inaccurate.
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.
Transmitter does not
track level.
Model incompatible with
process liquid
Verify model in use is appropriate for process liquid SG.
Possible damage to unit.
Check displacer, spring, stem and enclosing tube for damage.
Replace all damaged parts.
Possible material buildup
Check displacer, spring, stem, enclosing tube and displacer for
buildup of process material. Clean any fouled parts.
Displacer, spring or stem
dragging on inside of
chamber, e-tube.
Verify proper and level installation (within 3 degrees of plumb in all
directions).
Level reading on display Invalid poll address.
is correct, but loop value
is stuck at 4 mA.
Set poll address to 0 if not using multi-drop.
LEVEL, % OUTPUT and Liquid turbulence.
LOOP values fluctuate. _{Power supply unstable.}
Increase damping until output stabilizes or install stilling well.
Repair or replace power supply.
Electrical interference (RFI). Consult factory for assistance.
HART device only:
Handheld will only read
Universal Commands
Most current Device
Contact local HART service center for the latest DDs.
Descriptors are not installed
in handheld.
Cannot set high level to Incorrect power supply.
20 mA
Excessive loop resistance
Check power supply.
Increase power supply voltage or decrease loop resistance
(max 620 ohms @ 24 VDC).
Loop current less than
4 mA
Liquid level less than 0%.
Supply voltage out of limits
at transmitter.
No action required.
Adjust power supply or reduce loop resistance.
4 mA output does not
match display
4 mA may need to be
trimmed.
Use Trim 4 mA to adjust output to match display.
Loop current exceeds
20 mA
Liquid level greater than
100%.
No action required.
Supply voltage out of limits Adjust power supply or reduce loop resistance.
at transmitter.
Wired incorrectly.
Check power supply (+) and (-) for reverse wiring.
20 mA output does not 20 mA may need to be
match display
trimmed.
Use Trim 20 mA to adjust output to match display.
Output jumps quickly
over wide range
Bent stem impeding smooth Review Status History for Surge event. Inspect stem and replace if
core movement
damaged.
Non-linear output.
Excessive loop resistance. Increase power supply voltage or decrease loop resistance.
Displacer hanging up.
Verify proper and level installation (within 3 degrees of plumb in all
directions.)
Bent stem.
Check stem. Replace if damaged.
Possible material buildup
Check displacer, spring, stem, enclosing tube and displacer for
buildup of process material. Clean any fouled parts.
48-635 E3 Modulevel Displacer Level Transmitter
29