SAF - 1500 910101-000102
07.2109
Page 11 of 26
The filtration system may enter a malfunction mode in the following cases:
1st.
When there is a continuous signal from the pressure differential switch for a duration of more than the pre-
set time. This means that the self-cleaning process is not successful.
2nd.
When the motor protector was activated, either manually or due to over load.
3rd.
As a result of a malfunction in the limit switches.
Initiation of self-cleaning:
The filter will enter the self-cleaning process as a result of any of the following causes:
1. A signal from the Pressure Differential Switch (PDS) - The PDS which is situated on the filter body, sends an electric signal
when the pressure differential across the screen reaches the pre-set value (usually 0.5 bar =7 psi). The control board registers
the signal and operates the flushing process according to its program.
2. Manually pressing the "TEST" push button at the control board.
3. The TIMER installed in the control board allows operation of self-cleaning process at time intervals that can be set up,
independent from the head loss factor. The timer resets after every flushing cycle.
4. A signal from Continual flushing switch - This switch in the control board allows operation in continuous flushing mode;
meaning, the filter is flushing itself all the time regardless of flow rate or water quality.
Control system:
Two types of control boards are available: PLC Type and Relay Type. See Appendix A or B for details.
