MECHANICALS
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TROUBLESHOOTING
SYMPTOM:
No LED illuminated.
SOLUTION:
1)
Check voltage between L1 and N terminals if MAINS powered.
2)
Check voltage at 24 VDC terminals if low voltage powered.
3)
Ensure this voltage is within the voltage requirement on
the specification section.
SYMPTOM:
Unresponsive to changing dust conditions.
SOLUTION:
1)
Dust
Alarm
®
ES
not yet calibrated. See Set-Up and
Calibration section
2)
Sensing probe insulated by dust residue which has
collected onto probe. Remove sensor and clean probe.
3)
Poor location. Ensure sensing probe is not installed in
area where probe is exposed only to dead, stagnate air.
SYMPTOM:
Constant red LED activity.
SOLUTION:
1)
Moisture condensed onto sensing probe. Remove and
clean moisture from probe.
2)
Sensing probe touching ducting. Remount / relocate
sensor to prevent probe contact with ducting internals.
SYMPTOM:
Alternating flashing Red and Green LEDs indicat-
ing a fault, electrical short on probe.
SOLUTION:
1)
Ensure probe is isolated, not touching metallic structure.
2)
Wipe probe clean of any residue with a damp rag and
ensure the probe is dry prior to resuming operation.
It is especially important to clean the plastic insulator
portion of the probe.
See bulletin # 764C to navigate the
Dust
Config
TM
application to
configure these parameters.
To perform this function, connect a portable PC with the
Dust
Config
application loaded onto it to the sensor’s USB mini-B connector. See
bulletin # 764C to navigate the
Dust
Config
TM
application.
NOTE:
The sensor USB connector is NOT isolated from local
earth ground; the USB connection is intended for local, tempo-
rary connection during the configuration process only.
Calibration:
1)
Ensure that power and relay contacts are properly connected
2)
Ensure normal or acceptable level of dust particle emissions
are passing through the exhaust ducting (i.e bag filters are in
good condition).
3)
Disable filter cleaning systems (such as pulse jets, shakers,
etc.) as these devices will cause a temporary increase in
airborne dust particulates as these devices are activated.
4)
Press the Auto Set-up switch. This will start the process of
measuring the dust in the air stream to be used as a reference
value. This process will take approximately 16 minutes, and is
indicated by a flashing green LED. Ensure no unusual events
occur that could provide for false measurements during this
auto setup period. At the end of the of the period the green
LED will become constantly lit.
5)
Using the Auto Set-up method will automatically configure these
parameters:
Running average of measured signal: 100 sec time constant default
Alarm-1 threshold: 5x measured value from Auto Set-up default
Alarm-2 threshold: 20x measured value from Auto Set-up default
Alarm delay, hold on: 30 sec default
Alarm delay, hold off: 30 sec default
6)
The parameters above have proven to suffice for the majority of
the installations. However, these values can be further refined by
using the
Dust
Config
TM
PC application. See bulletin # 764C to
navigate the
Dust
Config
TM
application to adjust these parameters.
7)
An experienced programmer can also adjust the sensor
parameters through the RS-485/Modbus interface.
See bulletin # 764B for the Modbus register map that defines
the register parameter locations.
Routine Maintenance Program:
A routine maintenance program should be established for the
Dust
Alarm
®
ES
monitor using the following guidelines:
1)
The electronics should be re-calibrated once a year by
following the Calibration Auto Set-up Procedure.
2)
The sensor probe and insulator should be checked periodi-
cally after installation to determine if, and at what intervals,
cleaning is required. When monitoring a dust collector, the
sensor should also be checked after a major filter break or
other major process upset. The conditions to look for when
inspecting the probe are:
a) Build-up of material on the probe - Cleaning intervals
should be such that a heavy build-up of material is not
permitted to form on the leading edge of the probe. Build-
up on the trailing edge is not a concern.
b) Wet materials - Condensed liquids or conductive materials
should not be permitted to build around the insulator. If
these conditions are inherent in your process, please con-
sult the factory to ensure you have the proper probe
configuration.
3) Functional check
- If the process and conditions permit, it is
recommended that a test port be installed (See Mechanical
Installation section) upstream of the probe. This port can be
used to simulate a deficiency in the dust collector system by
introducing a small amount of dry powder into the process (i.e.
talcum powder).
MAINTENANCE
SYMPTOM:
No digital communications.
SOLUTION:
1)
Confirm power is applied by sensor lights.
2)
Check signal wiring, confirm polarities.
3)
Confirm the master device protocol matches the sensor’s.
4)
Confirm the device channel # in the master device
matches the sensor’s #.
