v 2.0 — March 2023 Altanium Delta5
106 UniStart
9.4 UniStart
The UniStart function provides the shortest start-up time while ensuring that all
temperatures track to their setpoint.
NOTE: If AltaStart is enabled, only non-tip zones will be included in the UniStart process. If
AltaStart is not enabled, then all zones will be included in the UniStart process.
When the Delta5 Start button is select, the system operates as follows:
1. Fast heating is applied if enabled. Refer to Section 9.5.
2. The lowest common Integral value (of PID) between all the zones is determined and is
shared with the other zones.
3. The global ramp limit is shared with all the other zones.
4. The zones in the UniStart process will no longer use the Ramp Limit or common Integral
when they enter the At Temperature window (refer to Section 7.8.4). The previous
Integral value will be restored.
The system does a check for power saturation during the heat process:
• If some zones have a power that is within 4% of the present power limit, the same
threshold as No-Response, it will be considered saturated. The zone with smallest delta
from the limit will be the lead zone.
• The present ramp of the UniStart group’s lead zone should be shared among all of the
zones in the group. This sharing is similar to that of sharing the Integral except that the
value is likely to change while heating. This value will persist for as long as the zone is
under UniStart control. As zones enter At-Temperature, all limits are lifted.
9.5 Fast Heating
The UniStart process heats the zones slowly, but evenly. When Fast Heating feature is
enabled, the system pushes some zones to heat faster, as follows:
• The system looks at all the zones to see if the Integral value (of PID) is less than 2. If it is,
then the value is changed to the lesser of either:
• Twice its normal value, or a value of 2.
• The Proportional (of PID) is then multiplied by a fraction. The fraction is the old
Integral value divided by the new Integral value.
Example 1: A zone’s ART PID values are 15.0, 1.2, and 1.4. The system will change the
integral value to 2 and multiply the proportional value by 1.2 / 2 or 0.6.
Then 15 x 0.6 = 9. The new PID values then become 9.0, 2.0, and 1.4.
Example 2: A zone’s ART PID values are 15.0, 0.6, and 1.4. The system will change the
integral value to 1.2 and multiply the proportional value by 0.6 / 1.2 or 0.5.
Then 15 x 0.5 = 7.5. The new PID values then become 7.5, 1.2, and 1.4.
• The new values (P and I) will be used until the zone’s temperature reaches the At
Temperature window. The P and I values will then be restored to their original values.
• This feature only applies to zones that are using ART PIDs.
• The Fast Heating Enable setting is saved to the mold setup. The default value is selected.
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