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
100.5per 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. |
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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. | |||
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