Velocity-Pressure-Time Parameters

[JayDub]

I assume you are using two-stage molding (fill and pack/hold). You will typically control the fill stage by velocity. In this case, fill time and maximum injection pressure are machine outputs, not inputs. (This is why moldflow only lets you input one of the three parameters). What the machine is asking for is safety limits – you do not want the machine applying high pressure for a long time if a runner or a gate is blocked, and the screw cannot reach transfer position. So, if your maximum injection pressure really is 30 mpa, you can set the limit to 33 or 35 mpa and if your fill time really is 3 seconds, you can set the limit to 4 or 5 seconds.

[Coryhoeppner]

This is something that the RJG TZERO team specialize in. You should look them up if you still need help.