M A G U I R E P R O D U C T S , I N C .
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G R A V I M E T R I C A U G E R F E E D E R
TAT
Target Adjust Threshold - Cycle mode only
Factory Default - MGF-4: 00025, MGF-8: 00025
Stored as 1/100th grams per second (00025 = 0.25 g/s)
When a cycle starts, the target grams per second rate (Shot weight / cycle time) is checked
against TAT. If the rate is below TAT, then the running motor time is halved, and the target motor
speed is doubled. This will continue until the target rate is above TAT.
Example: TAT = 00025 (0.25 g/s)
Shot Weight = 9 grams
Cycle Time = 88 seconds
this will result in a target rate of 0.102 g/s
Before the cycle starts, the MGF will see that the rate is below 0.25 g/s and adjust the run time
and motor speed to compensate for this. When the MGF runs it will have targeted a 0.409 g/s rate
over a 22 second period.
XFT
Extrusion Voltage Filter
Factory Default: 02003
Used for filtering incoming extrusion voltage. The parameter is separated into 2 parts: vvv.ff
vvv = cap to zero voltage in 1/100th of a voltage ff = fluctuation filter in 1/100th of a voltage.
NOTE: ff is capped at 0.50V or xxx50
LCL
LCH
Loadcell Low - Loadcell High
LCL factory defaulted: 00040. LCH factory defaulted: 00080.
LCL and LCH are used for full weight loadcell calibration. The LCL and LCH parameters ensure
that the calibrated weight falls with a reasonable slope. If the full weight slope
is outside the LCL and LCH defined slopes, then an error message:
'** BAD LOAD-CELL **' will be displayed.
HRT
High Rate Trip Point - Continuous and Extrusion Following only
HRT controls the adjustment to the ATP parameter. HRT is separated into 2 parts: xx.yyy
xx = new value for ATP yyy = trip point for changing ATP in grams / minute
1. If the current rate is above HRT (yyy) then adjust the ATP to HRT (xx)
2. If the current rate falls below HRT (yyy) then revert ATP back to previous setting.
ECT
Error Count Tracking
ECT is used to specify the delay in error tracking when first starting as well as after an error
correction is made. This parameter is broken into 2 parts: xx.yyy
where xx = number of cycles (Cycle mode)
yyy = number of seconds (Continuous mode)
IPC
Injection Color Percent – Cycle Mode only
Factory Default: 00025 (25%)
Percent of the color target that should be added during the injection time. Typically, material is dispensed
only during screw recovery. This parameter allows for a percentage of the overall color target to be
dispensed during the beginning of the cycle’s injection. The injection time is controlled by the ISP
parameter. This feature requires an injection signal (see MGF-STI Wiring Diagram).
ISP
Injection Screw Time Percent – Cycle Mode only
Factory Default: 10030 (enabled at 30%)
This parameter has two parts. The first digit (1xxxx) enables or disables this feature. 1=enabled, 0=disabled.
ISP is the Percent of Recovery Time used to calculate a time (in seconds) to dispense an amount of additive
(IPC parameter) at the beginning of the overall Injection Time. This parameter uses a percentage of the
recovery time (30% by default) to calculate how much time the MGF will dispense material during the
beginning of the injection stroke.
Summary of Contents for GRAVIMETRIC AUGER FEEDER MGF-ST
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