Home > NCU '99 upgrade
NCU '99 upgrade
1328 Azalea Garden Rd.
Norfolk VA. 23502
757-855-6006
Fax: 757-855-3761
Date: April 21, 1999
Contact: Customer Service ( )
This information bulletin affects - Nitrogen Control Units NCU4
NCU2-99 system upgrade.
The following system upgrades have been made to the NCU4 for the start of the Year 1999
1) Automatic purge cycle
Initiated by the mold open switch, an adjustable automatic purge can be enabled from the operator touch interface. The adjustable purge settings are as follows:
| Setting | Limits | increment |
|---|---|---|
| Cycle Count | 1 to 99 cycles | 1 cycle |
| Delay | 0 sec to 10 secs | 1 sec |
| Purge time | 0 sec to 10 secs | 1 sec |
| Pressure | 0 to 5000 psi | 500 psi |
Cycle count: The number of cycles that must be executed prior to initiating purge.
Delay: The number of seconds that pass after the mold switch opens before purge starts.
Purge time: The number of seconds purged.
Pressure: The pressure applied to the output during purging. Note: This pressure would be seen against a closed valve. If applied to an open nozzel, this pressure would not be expected and should be considered a max allowable.
If no purging is required, set purge time and pressure to 0.
2) 24 Pin interface connector
In the previous models, the initiate circuit was the only physical electrical connection between the molding unit and the gas controller. The customer simply connected this input in series with the molding units intitate contacts and its safety switches. This design prevented a pressure cycle from starting until the safety contacts we closed however after a cycle is started only the Kill Cycle switch (E-stop) will stop a cycle.
The '99 models now come with a Harting 24 pin connector alowing the conection of the following input contacts. Note: all input contacts are to be "dry type" contact with not external voltage conneceted.
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* Available March '99
Intitiate Contact: While no cycle is currently in progress, closing this input will start a new cycle. This contact can be closed momentarily or closed and held closed for the cycle duration.
Remote Cycle Kill: Closing this input will send a kill cycle signal to the controller. This contact should remain open for normal service.
Mold closed: The controller treats this input as a standard safety input which must be closed in order to initiate a cycle, and will kill the cycle if opened during same. If a purge cycle is due, purging will take place upon cycle end when this input opens. Note: The operator safety gate and purge shield must be closed for purging to take place.
Purge guard: This input must be closed for for a cycle to start and continue and for a purge to take place.
Operator safety Guard: This input must be closed for for a cycle to start and continue and for a purge to take place.
Channel enable: These contacts must be closed (either jumped on the plug connector or closed by the molding machine) in order to allow the controller to send a signal to its outputs.