Conair WSB - Manual (Page 65)

PTD Yield Control - extrusion control - Pulse Train Delta
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 counts came in at 101 per
second, then an error of 30 would accumulate in 1 minute. The PTD
parameter set to 00030 would cause a correction to occur at this level
of error.
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LIQ For LIQUID COLOR applications using dual pumps color 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 00007, which directs the
switch to occur to output 7, an output not usually used in FOUR
software controllers. Output 7 must first be prewired to an auxiliary
output which must be added to the side of the controller. Often, two
additional solenoids are added to provide air outputs to 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 00003, which is to say that the
"additive" outlet (output 3) is designated as the back up output for
COLOR (which is output 4). This means that the ADDITIVE thumbwheels
can not be used as this outlet is now being used as the backup output
for COLOR.
Other arrangements are possible, but will require some wiring.
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MCT Monitor Cycle Time
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.
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