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(2) Abort of AT
To abort the AT action, by showing the AT action control
screen, press the or key to select and press
key to abort AT and LED for AT monitoring also goes
off.
(3) AT unable for following conditions.
• When the control stop mode is on (The AT screen is not
displayed.)
• During manual output control (The AT screen is not
displayed.)
• The proportional band is setting (ON/OFF action).
(The AT screen is not displayed.)
• Lock No.2 or 3 is selected on the key lock set screen.
• PV (measured) value is over the scale.
• During the execution of soft start
(4) AT is automatically canceled in the following condition
during AT execution.
• Duration equal to or longer than 2 hours passed in the
output level of 0% or 100%.
• Power shutdown.
• PV (measured) value is over the scale during AT
execution.
(5) The items enable to be set are as follows:
• Level setting of the higher limit alarm.
• Level setting of the lower limit alarm or heater break
alarm.
• Screen number setting and key lock setting on the direct
call screen of mode 1 screen group.
(6) Relationship between AT and set value bias is as follows;
• When SB terminal is shorted before AT execution, AT
executes in the condition with SV+set value bias.
• When SB terminal is opened during AT execution
mentioned in the above, AT executes with SV+set value
bias condition, then controlled with SV condition after
completing AT execution.
• When SB terminal is opened, AT executes with SV
condition.
• When SB terminal is shorted during AT execution
mentioned in the above, AT executes with SV condition,
then controlled with SV+set value bias condition after
completing AT execution.
5-3. Setting of alarm
(1) Higher limit alarm setting
• The higher limit alarm set screen is shown in case where
alarm option is added and the higher limit alarm of the
alarm type select digit on the function selecting screen of
the mode 2 screen group is selected.
• Higher limit deviation value alarm is output for measured
value to be greater than set value + alarm set value.
• For higher limit deviation value alarm, if set value + alarm
set value exceeds the higher limit of the measuring range,
the action point is the higher limit of the measuring range.
• Higher limit absolute value alarm outputs alarm signal for
the measured value exceeds the alarm set value.
• With the or key, value at which the alarm signal
should be output is selected and registered with key.
Example 1:
In case of setting the alarm action point at 600 °C for higher
limit deviation value alarm. Set value is 500 °C.
As 500 °C + X °C + = 600 °C, X=600-500 = 100 °C should
be set.
Example 2:
In case of setting the alarm action point at 600 °C for higher
limit absolute value alarm.
The set point is action point.
(2) Lower limit alarm setting
• The lower limit alarm set screen is shown in case where
alarm option is added and the lower limit alarm of the
alarm type select digit on the function selecting screen of
the mode 2 group screen group is selected.
• Lower limit deviation value alarm is output for measured
value to be less than set value + (alarm set value).
• For lower limit deviation value alarm, if set value + (alarm
set value) is less than the lower limit of the measuring
range, the action point is lower limit of the measuring
range.
• Lower limit absolute value alarm outputs alarm signal for
the measured value is less than the alarm set value.
• With the or key, value at which the alarm signal
should be output is selected and registered with key.
(3) Heater break alarm setting
• The heater break alarm value setting screen is displayed
when the apparatus is equipped with the optional heater
break alarm function and heater break alarm is selected in
the alarm type selection digit of the function selecting
screen of the mode 2 screen group. The top row shows for
monitoring purposes the value of the presently flowing
current detected by CT and the bottom row shows the set
value of the alarm current.
• When OFF is set as the heater break alarm value, the
heater break alarm does not function.
• By setting OFF during heater break alarm signal output,
heater break alarm output is terminated.
• For set value other than OFF, heater break alarm signal is
output if the current that flows in case where control
output (contact or SSR drive voltage) is ON, is less than
set value.
• If LOCK mode is selected at heater break alarm action
mode select digit on the function selecting screen of the
mode 2 screen group and the break alarm signal is output,
alarm signal is only terminated by changing the break
alarm value into OFF or shutting down power.
If REAL mode is selected and heater current is less than
current value being set, break alarm signal is generated. If
heater current exceeds the current threshold (0.1A), output
of break alarm is terminated.
• Set the heater break alarm current value by means of the of
the or key and register it by using the key.
6. Supplement
6-1. Auto return function
In case there is no key operation for three minutes on each of the
screens except the control output screen and the heater break
alarm value setting screen, the basic screen of the mode 0 screen
group is displayed (auto return).
6-2. PID (Screen No.2, 4 and 5 of mode 1 screen group)
PID values are automatically set by performing auto tuning,
modification may be required for object to be controlled.
If auto tuning is not performed, PID value should be set.
Note:
When the AT action is aborted, each value for PID is not
changed.
ENT
ENT
key
ENT
key
key
one by one
point flashing
point flashing
point goes off to
indicate registration
0-2 Higher limit deviation value alarm set screen
continuing
key
ENT
key
key
one by one
point flashing
point flashing
point goes off to
indicate registration
0-2 Higher limit deviation value alarm set screen
continuing
ENT
ENT
