Filter Cleaning Valve Function - Nederman FlexPAK 800 DX Manuel D'instruction

The unit will now open and close the FCV 3 times and then leave the FCV in its closed
position. After the last cleaning cycle, the unit returns to Running mode and waits for the
pilot signal to stop. It is possible to perform multiple filter cleaning cycles in Running mode.
When the pilot signal stops, the unit runs for 10 seconds (DIR time) and then opens the FCV
and goes into idling mode. The unit waits for a pilot signal for 12 minutes. If the pilot signal
is not received during this time, the unit will stop the motor and go into Standby mode.
The idling time is set by the SSR timer and default is 12 minutes. DIR time is the delay after
the pilot signal has stopped before opening the FCV. The default is 10 seconds.
8.4

Filter cleaning valve function

The PLC output DO3 is set and sends +24 V to the solenoid valve. The solenoid valve opens
the air flow to the pneumatic piston, which moves the lid on top of the filter upwards
letting in air with atmospheric pressure to the filter top. This sudden opening of the lid on
the top lets in air with great speed which creates a sudden pressure rise above the filters.
The pressure increase blows air through the filter bags removing the dust from the filters.
When power to the solenoid valve disappears, the valve closes and evacuates the
pneumatic piston. The lid falls down and closes the opening of the filter top.
If the piston does not fall down, the piston may not evacuate properly. If the incoming
compressed air is disconnected, the piston should fall down allowing the lid to close the
filter top opening.
9 Maintenance
Maintenance work means that the equipment will have to be opened and possibly
dismantled. This may constitute a risk and the maintenance personnel need to know about
the risks that may occur when acting incorrectly.
WARNING! Explosion risk.
Stop operation and clean the entire filter thoroughly from dust before any grinding,
welding or other hot works are performed on the filter exterior or inlet.
WARNING! Risk of personal injury.
• Always use an approved breathing mask, goggles and gloves when replacing the dust
sack and other work that involves exposure to dust.
• The motor, fan and air duct may become very hot during operation.
• Use ear protection when the unit is in operation and work is carried out in the vicinity of
the upper section of the dust collector.
• Always disconnect the supply voltage with the maintenance switch before any service,
whether mechanical or electrical.
• Always lock the maintenance switch in the off position and, if possible, secure with a
padlock.
• Always disconnect the compressed air supply before any service, whether mechanical or
electrical.
CAUTION! Risk of equipment damage.
During maintenance, it may be necessary to remove the acoustic enclosure over the motor
while the motor is in operation. Take care to prevent objects from falling down into the
motor cooling fan.
NOTE! Contact Nederman if the frequency converter needs service.
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FlexPAK 800/1000 DX EN
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