I need some help with this program sequence. I can't make the bridge move again after the cell stop limit switch make the bridge stop on a cell.
The cell stop limit switch will still be actuated. How do I make it move to the next cell, and make it some the bridge again?
The sequence will be started by the 24 hour time clock, or the liquid level relay, or the manual backwash button.
When the time clock switch closes; or the water touches the probe or the manual backwash pushbutton is pushed; an input is applied to the plc, starting the backwash sequence. The backwash cycle light comes on and the bridge travels forward to the first cell.
When the bridge reaches the first cell; a limit switch hits the cell stud and the bridge stops and the hood goes down to seal off the cell. An 8 second timer in the plc allows the hood to get fully down and sealed. After the 8 seconds has expired, the backwash pump is turned on. When water reaches the prime sense electrode in the effluent pipes, the backwash time delay is powered. When the time set on the backwash time delay relay has expired, the backwash pump is turned off.
A 5 second timer in the plc allows settling time before anything happens. After 5seconds, the hood is raised. When the hood reaches full up, an input is sent to the plc starting a 1 second timer in the plc. After 1 second, the bridge moves forward to the next cell. The same sequence is accomplished at each cell in turn.
When the bridge reaches the last cell, the effluent end limit switch is tripped instead of the cell stud limit switch. The last cell is backwashed in the same sequence as the others except that when it is time for the bridge to move again, it travels in the reverse direction to the influent end. When the bridge reaches the influent end limit switch, the controls are reset until another backwash is called for.
The cell stop limit switch will still be actuated. How do I make it move to the next cell, and make it some the bridge again?
The sequence will be started by the 24 hour time clock, or the liquid level relay, or the manual backwash button.
When the time clock switch closes; or the water touches the probe or the manual backwash pushbutton is pushed; an input is applied to the plc, starting the backwash sequence. The backwash cycle light comes on and the bridge travels forward to the first cell.
When the bridge reaches the first cell; a limit switch hits the cell stud and the bridge stops and the hood goes down to seal off the cell. An 8 second timer in the plc allows the hood to get fully down and sealed. After the 8 seconds has expired, the backwash pump is turned on. When water reaches the prime sense electrode in the effluent pipes, the backwash time delay is powered. When the time set on the backwash time delay relay has expired, the backwash pump is turned off.
A 5 second timer in the plc allows settling time before anything happens. After 5seconds, the hood is raised. When the hood reaches full up, an input is sent to the plc starting a 1 second timer in the plc. After 1 second, the bridge moves forward to the next cell. The same sequence is accomplished at each cell in turn.
When the bridge reaches the last cell, the effluent end limit switch is tripped instead of the cell stud limit switch. The last cell is backwashed in the same sequence as the others except that when it is time for the bridge to move again, it travels in the reverse direction to the influent end. When the bridge reaches the influent end limit switch, the controls are reset until another backwash is called for.
