Omega CN158, CN154, CN155 Operation, Supplementary explanation of screens, Setting of set value SV

4-6. Supplementary explanation of screens

(1)0-1 Control Output Screen

•During manual control an output value is set on this screen. In automatic control, it is only for monitoring.

•For switching automatic control to manual, press the MAN key on the control output screen.

•The MAN monitor LED flashes during manual control and goes out when control is changed to auto.

•This screen is only for monitoring in the stop mode, when AT is ON, or keylock is set at 2 or 3.

•Manual control output is released if the stop mode is selected or the type of input or the measuring range is changed during manual control.

•For changing the manual output value, the and

keys are used. It is not necessary to press the ENT key.

•During manual control, the setting range of control output is between 0 and 100%. In case an output limiter has been set, that value serves as the higher/lower limit of the setting range.

•In ON/OFF action (P=0), manual control output should be at 0% or 100% (For V and I output, lower limit output limiter or higher limit output limiter).

•When auto is changed to manual, the action becomes balanceless and bumpless. If the measured value (PV) is out of the proportional band, it does not attain balanceless and bumpless action.

•If power is turned off during manual control output and is turned on again, the condition is stored in the memory.

Note: Moving to another screen while maintaining the manual mode is possible. In this case, it should be noted that control output is made manually. The apparatus is in the manual mode when the MAN monitor LED is flashing.

(2) 0-2 Control Execution/Stop Screen

• Use the and keys to select control execution (EXEC) or stop (STBY). Then register it by means of the

ENT key.

•Upon selecting stop, the STBY monitor LED turns on and the control output display turns to 0%.

•Upon selecting execution, the mode changes to automatic control; it is not possible to go directly from the stop to the manual mode. When control is being executed, the STBY monitor LED remains unlit.

•Even at stop, the alarm works.

•When AT is ON or 1, 2 or 3 of keylock has been selected, no change is allowed.

(3)1-6 Manual Reset Value Setting Screen

•In the PID operation, an offset is corrected automatically by I, i.e., integral calculation. When I is set at OFF, this correction is not made and output is manually increased or decreased for correction. This is called manual reset (MR).

(4)1-11 Proportional Cycle Setting Screen

•In the case of contact output or SSR drive voltage output, time in which output is ON + time in which it is OFF in the proportional band, that is, proportional cycle time is set.

(5)1-12, 1-13 Lower Limit and Higher Limit Output Limiters Setting Screens

•The output limiters function effectively to maintain the lowest temperature, to suppress control overshoot by limiting control output to minimum and maximum values set.

•In the output limiters, priority is given to the lower limit value. Therefore, when the lower limit is set at a value higher than the higher limit value, the higher limit value is forced to be the lower limit value + 1%. Therefore, the higher limit value cannot be set to be less than the lower limit value + 1%.

(6)1-14 Soft Start Time Setting Screen

•Soft start is the function selected to raise control output gradually in the beginning of control. It is effective in preventing excessive current from flowing into a heater or similar apparatus.

•Soft start functions in the following cases:

Upon applying power in the auto mode

When control stop (STBY) is changed to control execution (EXEC)

When scale-over is restored to the normal state (in auto mode)

The above are on condition that soft start time and proportional band are not set at OFF.

•In the following cases, the soft start function is released. Soft start time has elapsed without problem.

Auto is changed to stop or manual mode during the execution of soft start.

Soft start time or proportional band is changed to OFF during the execution of soft start.

The measurement range code is changed during the execution of soft start.

Control output characteristic is changed during the execution of soft start.

Scale-over of a measured value occurs during the execution of soft start.

Control output falls to a level below the output value of soft start during the execution of soft start.

•Auto tuning is unable to be carried out during the execution of soft start.

5.Operation

5-1. Setting of set value (SV)

(1)Press the or key to set set value. Keep pressing it to flash the point of the least digit of set value and increase (or

decrease) value.

(2)After confirming the value to coincide the set value, press

ENT to register the data.

(3)After registration of the data, the point of the least digit goes off.

Example: Setting set value to 500 °C.

0-0 basic screen

key	key	ENT key
continuing	point flashing one by onepoint flashing	point goes off to
		indicate registration

5-2. AT (Auto tuning)

(1)Execution of AT action

•By pressing the or key on AT action control

screen, display on lower row turns into and the point of the least digit starts flashing, then the LED for AT monitoring turns on to indicate AT standby. Press ENT key to start AT action with point going off and LED for AT monitoring flashing.

		• LED for AT		• LED for AT
0-0 basic screen	0-1	monitoring		monitoring starts
	AT action control screen	turns on		flashing	AT
key	key	ENT	key
					action
					Starting
	point flashing		point goes off to
			indicate registration

•When AT is carried out, ON/OFF action of output is repeated several times, with the set value as the border line, to make PID values stored in the memory and terminates. At the same time, control is started by using stored PID constants.

The AT monitor LED goes out and the display on the AT action control screen changes to

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