Ametek Drexelbrook ThePoint Series, Инструкция по установке и эксплуатации, Страница: 35 / 70

Troubleshooting
29
Symptom Possible Cause Solution See Section
Switch is in alarm and will not
clear
Sensor is coated by a conductive material and the
Cote-Shield™ element does not extend far enough
into the vessel
Need a sensor with a longer Cote-Shield
element. Rule of thumb is nozzle
expected wall c 2 inches.
Section 2.2
Fail Safe switch is set to the wrong setting Check to make sure the fail safe switch is in
the correct position
Section 2.6.3
Active section of sensor is touching an internal
structure or material is bridging active to ground.
May be able to shorten sensor (consult
factory) or relocate sensor.
Appendix A
Connection cable or harness between unit and
sensor is damaged
Check connection cable for shorts, opens, or
damage and proper termination
Section 3.6
Flexible sensor is swaying and active is touching
vessel or structure
Add 1 or 2 seconds of reverse acting time
delay.
Section 2.6.1
Switch stays in alarm for
extended period after level falls
below sensor
Material bridging from active to tank structure May be able to shorten sensor (consult
factory) or relocate sensor.
Appendix A
Time delay may be active Make sure time delay pot is full
counterclockwise.
Section 2.6.1
Switch does not respond to
material
There may not be enough active to “see” an
insulating material
Try changing to high sensitivity or adding
active length to sensor
Section 2.9.5
Appendix A
Switch was calibrated with sensor covered by
material
Make sure material level is below sensor
and re-calibrate
Section 2.9
Granular material – Active section is not getting
enough coverage due to angle of repose
Relocate sensor to get more coverage or
lengthen active. Changing to high sensitivity
may also help.
Section 2.9.5
Appendix A
Connection cable or harness between unit and
sensor is damaged
Check connection cable for shorts, opens, or
damage and proper termination
Section 3.6
Switch delays in responding to
material
Reverse acting time delay may be active Check time delay settings to make sure they
are correct
Section 2.6.1
LED’s are Flashing Flashing LED’s indicate one of two things.
Over Range / Under Range
Consult instruction manual to determine
which of the three symptoms are
experienced.
Section 3.4
Section 3.5
Over Range indicates that the
standing capacitance of the
sensing element in the vessel is
to large to allow calibration
A long sensing element may generate too much
standing capacitance to calibrate out
Padding is required – consult factory Section 3.4
The sensor could be touching an internal tank
structure
May be able to shorten sensor (consult
factory) or relocate sensor.
Appendix A
Switch was calibrated with sensor covered by
material
Make sure material level is below sensor
and re-calibrate
Section 2.9
Improper wiring connection (Remote Switches) Check remote cable connections to confirm
they are correct.
Section 3.6
Under Range indicates that
the electronic unit is not seeing
enough capacitance.
ThePoint ™ - Electronic unit is not attached to back
board
Probe to shield short
Check probe ad cable resistances
Remove electronic unit and make certain
that connection pins are not damaged.
Re inset electronic unit making sure it is
connected to back board.
Section 3.5
Section 3.1
Section 3.5
Unit is damaged Consult factory Section 3.8
Green Power LED is out Electronic unit is not getting power Check power source to make sure proper
power is supplied and connections are
correct
Section 2.3
Electronic unit is damaged Consult factory Section 3.8
Unit does not respond when
pressing the Calibration Button
Cal button only operates when switch is set to Auto-
Cal mode
Check to make sure switch is in Auto-Cal Section 2.9.5
Electronic Unit is damaged Consult Factory Section 3.8
3.12 RF Point Level Troubleshooting Guide