Plan Boucles De Commande Solénoïde Bacara Ac - YAMIT AF900 Série Manuel D'utilisation Et De Maintenance

F. FLUSHING PROCCES
General – Motor Scan is one motor movement from IN position to OUT position (or vice versa depending
on the previous motor position).
NON-DP FLUSH
Is activated in three conditions :
1. Pressing momentarily the FLUSH switch. (Manual flush).
2. Signal received at REMOTE inlet. (At signal transition from OFF to ON)
3. Flush by time base according to the internal INTERVAL Timer.
(Interval time , Set by screen no. 1.0.0)
Note that entering 0 Min. will disable flush by time base.
In this conditions the control unit will execute a flush cycle according to the following steps :
a. SV1 is activated. (First/one flushing valve open).
b. After preset time (Pre-flush time , Set by screen no. 1.0.1) the motor is activated for a preset no. of
scans as set on each condition scans. (Set by screens no. 1.1.0/1.1.1/1.1.2)
c. When motor scan/s completed the motor and SV1 is turned off.
DP FLUSH
A DP flush is caused by a differential pressure across the filter's system signal at DP inlet for preset time
(DP ON TM , Set by screen no. 1.0.2) will activates the DP FLUSH mechanism. In this condition, absence
of DP signal for preset time (DP OFF TM, set by screen no. 1.0.3) deactivates the DP FLUSH Mechanism.
This internal ON/OFF delay timers assure that accidental DP switch vibrating will not activates the
flushing mechanism.
Once a DP flush signal is registered , the control unit will executes a REGULAR FLUSH state as follows :
a. SV1 is activated. (First/one flushing valve open).
b. After preset time (Pre-flush time , Set by screen no. 1.0.1) the motor is activated for a preset no. of
scans as set DP REG. SCANS (Set by screen no. 1.1.3)
c. The DP signals is checked constantly
• If the DP signal is removed during the motor scan then the flushing cycle will finish it's scan and motor
and SV1 will be turned off .
• If the DP signal is continued after the first motor scan the motor will executes a second scan and so
on.
• If after x REGULAR FLUSH SCANS the DP signal is not removed then the control unit will enter to
EMERGENCY FLUSH state by turning on the SV2 solenoid (In addition to SV1 , Both flushing valves
opened) and for another x EMERGENCY FLUSH SCANS. (Set by screen no. 1.1.4)
• If DP signal continues in spite of x regular flush and x more emergency flush scans, which means that
the flushing mechanism is unable to overcome the differential pressure across the filter/s system
then DP FLUSH FAULT state is declared (FAULT Indicator lit.) and any further flush cycles is disabled.
• Pressing the FAULT sw. will reset the flushing mechanism and resume operation.
Example – 5 REG. FLUSH SCANS & 5 EME. FLUSH SCANS is set.
• If after 3 reg. flush scans the DP is removed then the system will return to normal state.
• If after 5 reg. flush scans the DP is not removed then the system will continue with EMERGENCY FLUSH
scans.
• If after 2 emergency scan (7
• If after the 10
th
scan) the DP is removed then the system will return to normal State.
th
scan the DP is not removed then the system will enter a DP flush fault state.
AF900
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