Shimaden SR73A Series Instruction Manual Download Page 8

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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

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 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.

(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

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%.

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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.

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(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

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.

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
key to start AT action with point going off and LED for
AT monitoring flashing.

• 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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key

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key

0-0 basic screen

continuing

point flashing

one by one

point goes off to
indicate registration

key

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key