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for example. You may wish to reduce this number so that operators are warned well in
advance of such conditions.
MCT
Monitor Cycle Time
– For Throat Mount Applications Only
This parameter acts as the ultimate fail-safe precaution. When used, it monitors sequential
cycle times, and alarms if a cycle time exceeds the previous cycle time by an amount that
is not consistent with proper operation. This provides a means to detect mechanical
failures such as a sticking valve or weigh bin gate. When set to 00000, this parameter is
not active. When set to MCT 02060, an alarm will occur when either a cycle time is double
(02xxx) the previous time, or exceeds it by 60 (xx060) seconds. At power-on this alarm is
always set off and disabled. Once smooth running is established, the alarm is enabled.
Smooth operation is established using the same logic that Extrusion Control uses. If the
alarm is activated, the display will say (TIME OUT). Press the alarm silence button to reset
the alarm. A new cycle will also reset the alarm. If another alarm is currently active
(material not dispensing for example) then this Monitor alarm is ignored or reset.
LIQ
For LIQUID COLOR applications using dual pumps / drums.
Liquid Color users generally want the current container of color to run completely out
before switching to a new container. Switching early requires the transfer of the unused
portion to the next container. This feature allows a standby container to be in place and
ready, and instructs the blender to switch to the backup container as soon as the first
container runs out, as detected by the lack of weight after a dispense. The default setting
is LIQ 10007, which directs that component 04 is the normal output, and 07 is the
component to switch to. Outputs 04 and 07 must first be prewired to an outlet that is added
to the side plate of the controller. Two additional air solenoids are also added to drive
liquid pumps that require air for operation.
When conventional pumps are used, two pumps must be present, each connected to a
drum of color. Both would have to be plugged into the two outlets on the duplex receptacle
on the front of the controller. The parameter would be set to LIQ 00304, which is to say that
the "additive" outlet (output 3) is designated as the back up output for COLOR (which is
output 4).
Other arrangements are possible, but require some wiring.
CPL
Yield Control - Counts Per Linear unit of measure
Customers using Yield Control require a pulse generator, or shaft encoder, mounted on
downstream takeoff equipment to signal the line speed to the blender. In operation the
software displays GRAMS per unit length, which may be per foot, per yard, per meter, or
whatever. For whichever unit length you select, enter the pulses per unit length in this
parameter. In America, a typical shaft encoder delivers 600 or 1200 pulses per foot. Set
the parameter to 600 or 1200. Everywhere else you are most likely concerned with meters.
The proper setting for this parameter is then the number of pulses per METER that the
encoder generates.
PTD
Yield Control - Pulse Train Delta, trip point
This allows some error in the pulse train rate. For example, if the pulses are being
generated at a rate of 6030 per minute, which is 100.5 per second, and we count pulses
every second, then we will count 100 for one second, 101 for the next, then 100, then 101
and so on. This "error" could cause adjustments to occur when no adjustment is warranted.
The PTD parameter specifies how many over or under pulses have to accumulate before
adjustment occurs. In the above example, if 6030 per minute was what we wanted, but
Summary of Contents for Weigh Scale Blender
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