Can I speed up the fill operations on my HI 2151/30WC?

There is a newer product that fits into the Controllogix PLC backplane, called the HI1756-nDF (n for1 or 2 channels)  Dispense filler with a much much faster response for filling and dispensing applications.  (100hz+ v/s 20hz updates).  For new applications or applications desiring a faster response, contact your local Hardy Sales representative for details.

To speed up fill operations on your HI 2151/30WC you should use a fast and slow speed feeder. The following numbers are only for our example. Your numbers may vary with production requirements.  (NOTE: The HI 3010 controller has many of these features plus automatic preact correction and fast feed target adjustment parameter.)

SP1 = 15 lbs, deadband = -5, preact = 0
SP2 = 20 lbs, deadband = -5, preact = -1

Specifications: The Vibratory feeder and fast feed slide gate will activate when the batch starts. The fast feed slide gate will deactivate at Setpoint 1 or 15 Lbs. The Preact can be set to a negative value to compensate for a slow closing slide gate.

The vibratory feeder continues until Setpoint 2 (20 lbs) is reached. Then the vibratory feeder stops. If the vibratory feeder over fills the batch, it’s Preact can be adjusted to a negative value to compensate for the in-flight materials.

THREE RULES OF SETPOINTS:
1. Setpoints activate at the setpoint plus the preact.
2. Setpoints deactivate at the setpoint plus the deadband.
3. The deadband should be numerically larger than the preact to prevent relay chatter.

If you do not want the bag to over-fill, a preact could be established. A Setpoint 2 Preact of -1 Lbs. would activate the Setpoint 1 Lb before the Setpoint 2 weight is reached. This could allow for in-flight materials that could over-fill the bag before the valve closed.

Adjusting the Preact to match your particular valve timing will allow you to change the Setpoint and not worry about the valve. Your Preact settings are derived from observation and experimenting with your particular vessel and valve control mechanisms. Start with a Preact setting equal to zero.

Faster weight readings will allow you to make finer adjustments. Adjust the average and WAVERSAVER to minimum settings for optimum weighing speed. Increase the fast fill rate so as to minimize the time required for slow trickle speeds, yet never over filling with the fast fill.