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Functions (cont’d)
COMPUSTEP
®
/ BAKE OUT / SOFT START
Gradually applying power to the heaters extends the life of the heaters and
the mold. Phase angle firing is used to implement the CompuStep feature.
The CompuStep will last for 5 minutes or until the temperature reaches 200
°F.
CompuStep is a self-terminating feature but the operator may also terminate
it by pressing the MODE key.
AUTOTUNE
The Athena
®
autotune process executes according to the value established
for the autotune parameter in the PID menu (default is to operate “ONCE”).
The tune operation will follow CompuStep. The tuner looks for stability in the
process temperature before it proceeds. If system stability cannot be
achieved within a fixed time period then the tune process will terminate. The
operator has the ability to terminate autotuner execution by pressing the
MODE key while the autotuner is active. During autotuning, the display
alternately flashes “tun” and the process value.
AUTO CONTROL MODE
The default (auto) control mode is PID. The rate and proportional band
parameters appear in the menu system. The reset parameter is always set
to a value equal to five times the rate. The RMB has a fixed cycle time of
100 ms (10 Hz).
Functions (cont’d)
MANUAL CONTROL MODE
Switching between Auto and Manual mode is easily accomplished by
pressing the MODE key to toggle between both states. In Manual mode, the
LED indicator labeled “Manual” is illuminated. In Auto mode, it is not.
Manual control is also activated at zero percent when input error conditions
arise and under these circumstances is activated automatically regardless of
the “MODE” key Enable state. The initial control percent, established when
manual control is activated, is dependent upon the cause of activation.
When entered normally because of operator actions, a bumpless transfer is
attempted. Pressing the “MODE” Key again (when in manual mode) returns
the control to automatic mode.
BUMPLESS TRANSFER
The RMB employs an intelligent bumpless transfer. When the process is
within five degrees of setpoint, the controller periodically records the output
percent necessary to maintain setpoint. When an operator initiated transition
to Manual Control occurs, the recorded output percentage is used.
This is adjustable 0 - 100%.
GROUND FAULT DETECTION OPTION (standard on domestic units)
If a ground fault is detected during power up and if the unit is below 200 °F
(93.3 ° C) during any operating mode the RMB makes up to three attempts
to use CompuStep
®
to resolve the problem.
If the ground fault signal is still asserted when the unit is above 200 °F
(93.3 ° C), a steady “gFi” will appear in the lower display, and the Alarm
LED will illuminate. All other indicators will be off and all control processing
will terminate. Power to the unit must be reset to resume control.
(13 paginas)
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