1328 Azalea Garden Rd.
Norfolk VA. 23502
Date: January 2004
Contact: (productsupport [at] bauercomp [dot] com)
This information bulletin affects - NCU4 Version 2
The following information describes the two basic methods of system control utilzing the cycle start and the channel enable inputs to gain maximum control of your Bauer NCU.
Operators should read Interface connector configuration prior to reading this information.
The most common method for system control for the multiple channel Nitrogen Control Unit utilizes the start delay timers for the individual channels. With the channel enable inputs jumped (see below) to allow the required gas outlets to be used, a cycle can be started by shorting the cycle start pins. These inputs may be closed momentarily or held closed for the duration of the cycle. After a cycle has been initated, any offset in pressure profile in the individual channels can be controlled by the start delay setting on the individual channel setup pages. It should be noted that the point in time that the initiate contact is closed is the start point for the individual channel start delays so all channels are syncronized to this point. After the cycles have started, the initiate inputs may be opened and the cycles will continue. At this point, opening the channel enables, the safety inputs, the mold input, waiting for all step timers to time out, or closing the cycle kill input will stop the cycle in progress. It should be noted that holding the initiate input closed after the cycle timers have expired just keeps the cycle running and this input must be opened to reset the system if all other inputs stay constant.
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If individual channel control is required, the initiate input may be jumped to the mold input. This method is sometimes employed in simple interface installations so the cycle is initiated as soon as the mold is closed and the start delay timers are then used to allow enough time for plastic to be injected into the mold cavity. Using this method however, the individual channel enable inputs may be connected to separarate normally open mold unit relay contacts. These contacts can then be closed as required (and held closed for the duration) to allow the mold unit full control over when the individual channels are initiated. Whether the channel start delay timers are used or set to zero, the separate channels are then not syncronized to each other and are controlled only by their enable inputs.
Note: As stated in "Interface connector configuration" , The version II systems are capable of being controlled by two molding units. When multiple channels are used on one molding machine, one simply jumps the inputs (Pins 1,2,3,4) to the second set of inputs (Pins 6,7,8,9 respectivly) inside the customer side of the 24 pin connector. This way closing the mold input for the first set of channels (pin 3) will also close the mold input for the second set of channels (pin 8), reducing the number of wires to the molding machine.
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.
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.
Safety Circuit: This input should be wired through the Purge guard switch and the operator guard switch (and any other machine safety contacts) in series. This input must be closed 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.