Installation, Operation and Maintenance Manual
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drops below 40 daPa, the controller will stop the cleaning when a full cycle is completed; this is called
‘Stop & End’ cleaning.
If off-line cleaning is to be carried out this is done one module at a time, the fans of the other modules
maintaining suction in their respective unit sections to avoid powder clouds being generated outside the
unit.
The number of cleaning cycles carried out depends on the pressure drop at the time the unit is stopped,
the number of cycles set and also the pressure drop across the filters during the cleaning cycle. This
sequence is designed to optimise the cleaning effectiveness while minimising air usage and cleaning
time. During off-line cleaning the display will indicate the module being cleaned and the number of
cycles remaining.
For ECB units handling explosive powders, and hence operating in a hazardous area the cleaning
sequence is carried out only when the unit is off-line using the sequence described above. Cleaning on
line is not initiated, regardless of filter differential pressure, to avoid generating a potentially hazardous
atmosphere within the collector during periods where the working area outside the unit could potentially
generate ignition sources.
The contactor provided to activate working area lighting is de-energised during off-line cleaning periods.
The software parameters controlling these cleaning sequences are factory set to correspond to the unit
type supplied and installation conditions and cannot be changed.
5.3. Status LED’s
The status LEDs on the front display panel of the TCB have the following meanings:
SERVICE LED - When during normal operation the service LED lights up, the unit needs to be
checked by a Nordson representative.
LED BAR GRAPH - The LED Bar graph will indicate the actual status of the filter
ALARM LED - The Alarm LED will light up when one of the followings alarms occur:
- Fan overload protection tripped
- One or both additional alarm inputs at the module are “low”
- DeltaP Alarm
FAN / PULSE LED - The Pulse LED will flash when a pulse is active. When the Fan set is
running, this LED will be on. When in the mean time the valves are pulsing, this LED will go out
briefly on every active pulse. When the fan is not running, the LED will be out and flash when a
pulse is active.
PULSE STOP LED - The pulse stop LED will light up when cleaning is not active.
OFF LINE CLEANING LED - The Off-line Cleaning LED will light up during off-line cleaning.
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