Nederman FlexPAK 800, Setting Manual, Page: 38 / 44

FlexPAK 800/1000 EN
38
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.
8 ATEX Duct Isolation Valve settings
This is for ATEX units with the Duct Isolation Valve and Duct Isolation Damper.
8.1 Flush Cycle settings
One of the already occupied outputs is used to control the Duct Closing Damper. Output
DO12, is used to control Duct Isolation Damper; it is the same output that controls Flush
Valve 2.
If the Duct Isolation Damper is installed, it reduces the flush function to only one flush
valve, Flush Valve 1.
The software can still control both flush valves but in this software, but the Flush Valve 2
setting is changed.
8.1.1 FlushCy1(T) (Timer)
Control Flush Valve 1, has output DO5 Terminal 73 and 74.
This function is still in standard operation and settings. Default setting T10 = 10 seconds.
8.1.2 FlushCy2(T) (Timer) (Dual Function)
Control Flush Valve 2 or Duct Isolation Damper, has output DO12 Terminal 64 and 65.
This function is still in standard operation, default setting is changed and adapt to the Duct
Isolation Damper setting.
If you use DO12 to a Duct Isolation Damper, there is no need to set FlushCy2(T). T=0 is the
default.
1. Duct Isolation Damper setting
–
T=0s (Default setting)
2. Flush Valve setting
–
T=10s
8.2 Tuning Duct Isolation Damper sequence
Use figure
‘3’
as a reference when reading this tuning description.
Normally the default setting a is proper starting point to use and test the FlexPak system.
If a problem occurs such as an unintended activation of the Duct Isolation safety valve, it is
time to consider tuning the Duct Isolation Damper sequence.
8.2.1 FCDely(T) Parameter
Filter cleaning delay time is used to ensure that the Duct Isolation Damper is closed before
the first filter cleaning (FC) pulse.
To set FCDely(T) parameter, it is necessary to know how long time it takes for Duct Closing
Damper to go from Open to Closed.
Test the time it takes for the Duct Closing Damper to close at the default Vacuum set point
for the system.