recommended) and it will not cause any error in the displayed measurement. Another more common procedure would be if an operator intermittently adds a processing agent to the extruder by dumping it directly into the weigh hopper. This will not cause any error due to the measurement algorithm that was previously mentioned.
Max Allowed WTP/RPM
If a lbs/hr per RPM value is every calculated above this setting then the GH will ignore the sample. This is to prevent an operator from draining a hopper while running and causing an erroneous, but consistent measurement. The flow through an open drain tube is very consistent and would cause the extruder to respond by speeding up unless this value is setup. By default this is disabled and must be configured by a knowledgeable service person. After running for some time you can go to the WTP/RPM Calibration page and observe the average WTP/RPM factor. You can then set this value above that by
Figure 71: Typical Mechanical Options Screen
Max speed of
GH-F
Gravimetric
Feeder
Only)
Used to change the pulses per revolution of the extruder
Should be factory set to “GH Hopper Mode” unless system is a
Go back to
Engineering Only
Directory
Mechanical Options Screen
For a
The mechanical options screen also allows the user to set the method of obtaining the extruder’s RPM. This setting should also be factory set.
If the optional Ethernet module is purchased, the unit should be set to “Write Ext RPM through COM (F13:1).
If the extruder’s RPM is being measured with the supplied proximity switch the unit should be set to “Measure Ext RPM with Prox”. If the mechanical device to measure the extruder’s speed presents more than one pulse per revolution, this value may be changed on the “Mechanical Options” page also. Simply input the number of pulses per revolution in the “Extruder PPR” field.
The hauloff encoder setting is only used on GH Full Control Systems.
The “GHF feeder max RPM” setting should only be set if the system is a
Chapter 7: Appendix | 53 of 60 |
