Magnetrol E3 Modulevel - Maintenance and Troubleshooting; Troubleshooting Common Problems; Loop Current and Output Issues; Display and Level Tracking Problems

19
MAINTENANCE
TROUBLESHOOTING SYSTEM PROBLEMS
S
ymptom
P
roblem
S
olution
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.
L
EVEL, % OUTPUT and
LOOP values are all
inaccurate.
B
asic configuration data is
questionable.
V
erify 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
is correct, but loop value
is stuck at 4 mA.
Invalid poll address. Set poll address to 0 if not using multi-drop.
LEVEL, % OUTPUT and
LOOP values fluctuate.
Liquid turbulence. Increase damping until output stabilizes or install stilling well.
Power supply unstable. Repair or replace power supply.
Electrical interference (RFI). Consult factory for assistance.
HART device only:
Handheld will only read
Universal Commands
Most current Device
Descriptors are not installed
in handheld.
Contact local HART service center for the latest DDs.
Cannot set high level to
20 mA
Incorrect power supply. Check power supply.
Excessive loop resistance Increase power supply voltage or decrease loop resistance
(max 620 ohms @ 24 VDC).
Loop current less than
4 mA
Liquid level less than 0%. No action required.
Supply voltage out of limits
at transmitter.
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
at transmitter.
Adjust power supply or reduce loop resistance.
Wired incorrectly. Check power supply (+) and (-) for reverse wiring.
20 mA output does not
match display
20 mA may need to be
trimmed.
Use Trim 20 mA to adjust output to match display.
Output jumps quickly
over wide range
Bent stem impeding smooth
core movement
Review Status History for Surge event. Inspect stem and
replace if 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.