SEQUENCER WITH
DIFFERENTIAL PRESSURE
SWITCH
Technical notice
FI 72.0567.0221E
Page 37 / 45
OPERATION :
Depending on the design of the filter and the process, the SFX+V2 can manage several operating cycles:
-
“Putting in service” cycle
- ONLINE declogging cycle
- OFFLINE declogging cycle
As standard, ONLINE or OFFLINE declogging cycles are managed.
The operating responses, operating states, etc., possibly given by the SFX+V2 are included and detailed in the
electrical diagrams.
If a filter is designed to have cells in maintenance, they are not declogged when they are in maintenance.
If the compressed air is managed, the SFX+V2 does not declog the solenoid valves associated with a tank with a
mini pressure fault or re-inflation faults.
Depending on the configuration, there is or not a RUN / STOP mode:
- RUN mode allows cycle management.
- STOP mode neutralizes all cycles.
Putting in service :
Depending on the configuration, the SFX+V2 has or does’nt have a ‘putting in service’ order (see electrical diagram).
If it does’nt have one, the ‘putting in service’ cycle is performed each time the cabinet is powered on.
The ‘putting in service’ cycle consists of requesting the inflation of all tanks by opening the valves of the compressed
air tanks (if this is part of the filter configuration).
The SFX+V2 considers that the ‘putting in service’ is effective after inflation of all the tanks (service pressure reached)
or after a timeout T8.
If at the end of ‘putting in service’, a tank is not at operating pressure threshold, but has reached the mini pressure
threshold, there is no fault generated.
If a mini pressure is not reached, a mini pressure fault is generated (see fault check
→
mini pressure faults).
At the end of the ‘putting in service’ cycle, declogging in ONLINE or OFFLINE mode is authorized.
If the
‘putting in service’ order is lost, the pressure tanks are insulated again.
NOTE: an "SFX+V2 in service" output (depending on the configuration) indicates whether the SFX+V2 is in service
(= 1 if the end of the cycle
‘putting in service’).
