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Time Sequence Controller
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Two microprocessors are used by the display system and the sequence controller. Three cycle counters are supplied, and each can be individually cleared. |
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The unit includes a complete user interface. There's a rugged operator keypad and a bright display that is visible from twenty feet. |
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The controller electronically sequences through a series of programmable steps. Each step has a setpoint time that determines how long that step is held. The states of twelve SSR outputs are asserted during each step and can be programmed by the user. |
This electronic step sequencer was developed to control time sequenced industrial machinery, such as a tire curing press.
The device was designed to be a direct upgrade replacement for older style disk, drum, and electronic sequencers. The control is self contained and built into a rugged steel enclosure that fits into the same machine panel cutouts as older style sequencers. Solid state relays are used to provide AC or DC outputs for control of the machine's external solenoid valves and loads.These outputs are programmed by the user to be on or off during any step time.
Other control and handshake signals are provided for interface to a remote machine control system, which can be relay logic or PLC. Alternately, the system can be made to stand alone for automatic cycling.
Ten different timing sequences of up to 99 steps each with up to 10 hours per
step are stored in the system's non-volatile EEPROM memory. The current
operating status of the controller is saved in non-volatile NOVRAM memory when
power is lost. The controller is restored to that status when power returns and
will continue from that point in its step program as if nothing happened.
A programmable under cure timer and watchdog timer are included. A keyswitch on the front panel secures access for all step and output programming. Programming can be done at the front panel display and keyboard while the unit is in operation. Various run time information can also be selected for display by pressing buttons on the keypad. The unit includes RS232 and RS485 industrial multi-drop network interfaces to communicate with a remote PC or sequence controllers on the plant floor.
