amiad Filtomat MG-110P, Installation, Operation And Maintenance Instructions

Page: 11 / 51

MG110P
7.2013 Page 11 of 51
How the Flushing Controller Works
The flushing controller is operated by 12 VDC. It receives a signal from the Differential Pressure Switch when the pressure differential
reaches the preset value (0.5 Bar, 7 PSI). The flushing controller then sends a 12 VDC pulse to the Pulse Solenoid, which provides
hydraulic pressure to the Hydraulic Relay which actuates the piston. Where there are several ganged filters, there are solenoids to
each relay valve and piston and they are activated in turn, not simultaneously, in order to maintain inlet pressure and avoid large
pressure drops. The unit can also control a downstream valve, which may be closed while flushing to increase pressure. An optional
electronic counter can keep track of the number of flushing cycles.
Parameters which may be set include:

Mode of operation: Manual, Differential Pressure (DP) only, DP with time override

Flushing cycle

Flushing time

Dwell Time

DP response delay time

Number of consecutive flushing cycles by DP, to be considered a fault
How the Hydraulic Relay Works
The hydraulic relay valve, when not actuated by hydraulic pressure from the pulse solenoid, allows pressure to pass to the hydraulic
piston, extending it, and holding the suction scanner away from filter lid. When the hydraulic relay is actuated, pressure to the piston is
shut off and the water in the piston flows out to the drain. When the piston is no longer under pressure the suction scanner pushes the
piston away from the filter lid.
Figure 5: Hydraulic Relay