Chemical connections for the Milnor CBW and PulseFlow batch washers

Well, you guessed it...there is more than one way to get the job done.  Here are some options...

Warnings on chemical signals:  

NOTE A)  The drain valve output will disable all outputs in a module.  So, if you use method 1 or 2 below you must not program a drain when you need a chem signal or the chem signal will not turn on.  You can move chem signal to other modules with a negative op code assignment if needed.  Optionally, you can program a drain at a later init code to prevent the drain from interfering with the chem signals.  

 

There are 3 methods to communicate chem info from the CBW to the chem system

1.  Connect output relays in the Milnor CBW directly to the chem pumps 
   1. A normal CBW has 32 output relays dedicated to chemistry.  You can wire these directly to the trigger that starts the chem pump.  You would supply power for the pumps at the chem system but use our signal to turn on the pumps.  
   2. You can inject by time or by units (ounces, CC, etc) and can also configure flow rates of the pumps to help calibrate without changing every formula when you maintain the pump.  
   3. This system allows the use of Milnor's First Dosing capability which can be beneficial when making big changes in soil classifications.
   4. Each formula is programmed with the time or quantity to be injected. 
   5. See the warning above!
   6. These chem signals are on the green relay bank shown here on the right control box.  You will have a common, normally open and normally closed contact for each signal.  Tie the common for all signals to your common and each normally open to your trigger input.
2. Use a binary data transfer of the wash formula to an external computer (chem system), along with a data valid signal and a transfer signal.  
   1. This method is common if you have a chem  control system connected to the chemical pumps.  The outputs from Milnor communicate the formula and a transfer (or trigger) signal.  
   2. In this system the formula (or recipe) is programmed in the chem system and the CBW has no control over individual pumps.  
   3. Each formula is programmed with the appropriate outputs "on" to send the formula data.  
   4. See the warning above! 
   5. Example of programming the functions for binary data pass in a module other than mod 1. Note there is no drain in Mod 8  
3. Use the HELMS interface to communicate wash formula, weight and customer code
   1. This option can be added to later model CBW's and allows a data pass over 2 wires to the chem system.  This is a serial data protocol that needs to be read by the chem system.  It was made standard on new production in April of 2021.  Chem system needs to supply 24VDC for the signal switching.  
   2. See Helms Interface for more details.
   3. The HELMS interface is not affected by the drain signal in a module.