Maguire Products WEIGH SCALE BLENDER WSBMB Series, Установка, эксплуатация и обслуживание

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M A G U I R E P R O D U C T S , I N C .
89
W E I G H S C A L E B L E N D E R
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Remember that EITHER ONE of the two parameters listed here will
cause retries to occur. BOTH parameter conditions must be met before
the process will continue, with one exception: If the ALARM parameter
(_AL) is set to 00000, indicated that you do not want the process to stop,
then these two RETRY parameters will have no effect. The first
dispense will always be accepted and no retries will be made.
_LA
Change if you change metering device
_LA is the lag TIME before dumping actually starts. This lagtime is the time it takes
for the dispense system to mechanically respond to the controller's signal to start.
Lag time is automatically added to all dispense times.
Changing the means by which a device is operated such as using a different
diameter air cylinder, or a different drive system for an auger feeder may require a
change in this parameter. These parameters represent the number of interrupts
(time) that pass before the feeder or dispense system actually begins to dispense.
There are 244 interrupts per second. To determine these times, use the TIME
dispense function in the Manual mode (KEYPAD instructions).
Following the instructions given in the KEYPAD portion of the manual (TIME key),
start with a dispense time of 1 (001). Try successively higher time numbers until
some movement is noted in the mechanical device and a minimum amount of
material IS dispensed on each try. This is the MINIMUM lag time number; the lowest
number that DOES cause some movement and DOES result in a minimum dispense.
Add 5 to this time period and enter as the lag time. Lag times that are too short can
cause problems. That is why the MINIMUM lag time determined above should be
increased by 5 as a safety factor. 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.
_PO
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.