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2) Supplemtary explanation of using the manual control output

Monitor screens (OUT1 and OUT2) and automatic/manual output:

When automatic output is changed to manual, balanceless/bumpless transfer is provided, and the value of output

right before the change is displayed. Changing from manual to auto also provides balanceless/bumpless transfer,

but not if the PV value is outside the proportional band.

If power supply is shut off and power is applied again, control output continues to be in auto or manual at the time

when power supply is shut off.

NOTE:Although a change to another screen in the manual mode is possible, it should be noted that control output is

manual in this case. Flashing of the MAN monitor LED indicates that the manual mode is ON.

Manual output is released when one of the following parameters is changed:

Range, unit, or higher/lower limit of scaling

(3) AT (auto tuning)

AT is the function of automatically computing and setting P.I.D. value, the parameters of P.I.D. control.

Computing time differs depending on the details of control.

1) Execution of AT

Pressing the key on the 0-4 AT action control screen, change displayed on the bottom to and the

decimal point of the lowermost digit flashes. Then press the

key. The decimal point stops flashing, the AT lamp

flashes and AT starts.

When AT is executed, ON-OFF action of output in response to rising and falling of the measured value from the target

set value is repeated several times to store PID values internally and AT ends. At the same time control using stored

PID values begins and the AT lamp goes out.

Key Key

0-4 AT action control screen

2) Stop of AT

To stop AT in the middle of execution, select by using the key on the 0-4 AT action control screen and by

pressing the

key, releases the AT and the decimal point and the AT lamp stops flashing.

Key Key

0-4 AT action control screen

NOTE: In case AT is released in the middle, PID values are not changed.

3) Unexecutable conditions of AT

In the following conditions, AT is unable to be executed:

Control output is in manual. (The AT screen is not displayed.)

Under STBY mode. (The AT screen is not displayed.)

Scaleover of PV (measured value). (The AT screen is not displayed.)

OFF is selected for proportional band (P) of output 1. (The AT screen is not displayed.)

Lock No. 2 or 3 is selected on the keylock screen.

Shimaden SR93 User Manual

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