Maguire Products Weigh Scale Blender WSB, Operation & Maintenance Manual

Page: 54 / 99

M A G U I R E P R O D U C T S , I N C .
Edition: August 6, 2014
54
W E I G H S C A L E B L E N D E R
®
These numbers are preset at the factory for the equipment we have supplied. When a
dispense of only a few grams is required, the _LA number is very important. Too small a
lag time will result in no dispense at all because of inadequate time for the device to
operate. Too large a number may result in over dispenses when very small amounts are
called for. Since too small a number may stall the process, always add 5 to the minimum
as a safety. Pilot valves on removable hoppers are set to 00004.
Typical LAG TIMES are: (minimum time plus five)
15 - for an AC motor being powered through a relay.
10 - for a 1" air cylinder sliding a dispense valve.
127 - for a MAGUIRE automatic speed controller.
WT/TI - Dispense Rate (grams/second)
WT Weight
TI Time
Set AUTOMATICALLY by the CALIBRATE routine
_WT, and _TI parameters are related to the flow rate or dispense rate of each material.
These can be changed manually, set by the RATE CALIBRATION routine, or simply
allowed to adjust automatically as necessary after each cycle.
_WT and _TI are WEIGHT and TIME numbers that, taken together,
indicate a dispense rate for the specified material (WT/TI). This rate is used to calculate an
exact time period to dispense the required quantity of material. Both of these numbers are
adjusted by the computer logic after each cycle as a means of continuously calibrating the
dispense times.
Since rate correction takes place continuously and the battery-backed RAM maintains the
correct rate even when power has been turned off, these numbers will only be in error
during the first several cycles after a flow rate has been considerably altered.
Should there be a change in auger size, drive motor RPM, or some other change that
substantially alters the feed rate of one of the components, the _WT and _TI parameters
can be adjusted using the RATE CALIBRATION routine to ensure that the feeders
dispense properly right from the beginning without waiting for adjustments to occur.
These numbers are always kept at higher values. The computer will bump both numbers
up in value by doubling them both until at least one number exceeds 16,000. The ratio
(rate) is still the same but error correction routines work better with higher numbers.
PO
Pulsed output / timing - For Micro Pulse devices only
_PO sets the ON and OFF time of the specified device during the time period that the
device is operated. This results in a "pulsed' output. This is used in combination with a
"micro pulse" equipped slide gate. Set to 00000 for normal operation. Set to 00101 for
pulsed operation. The first three digits (001xx) controls ON time in tenths of seconds. The
last two digits (xxx01) controls OFF time. Larger numbers produce slower dispense rates
without any increase in accuracy. Smaller numbers may not allow enough time for the
slide to shift fully.