K8AC-H
15
Measurement Monitor Value Display Ranges and Functions
Other than measuring the heater current, the K8AC-H can measure the power supply voltage, maximum/minimum current, maximum/minimum
voltage, and other values. The measurement data can be monitored from a host using RS-485 communications. The measurement monitor value
names, display ranges, and functions are given in the following table.
*
Each measurement value can be individually reset. Refer to the K8AC-H Digital Heater Element Burnout Detector User’s Manual (Cat. No. N132)
for operating procedures.
Modes
Groups of setting items are called “modes.” The K8AC-H has five modes.
Note: If more than five minutes elapses with no operations performed in the Protection Settings Mode, Adjust Mode, or Set Mode, the status will
return automatically to the processing value display. If this occurs while settings are in progress, it may cause unintended operations in the
processing value display. Be careful not to allow this to happen.
Settings Data Notation
The letters of the alphabet in settings data are displayed as shown below.
Measurement monitor
value name
Display char-
acters
Display range
Unit
Function
Power supply voltage
sce
0085 to 0264
V
This is the measurement value of the K8AC-H power supply voltage. When the voltage
fluctuation compensation function is enabled, the heater burnout determination based on
this voltage is automatically compensated.
Heater 1 maximum current
*
max1
0100 to 2300
A
These hold the maximum and minimum values for each processing value.
•
The maximum and minimum heater currents after the power is turned ON or after a
maximum or minimum reset are displayed.
•
The values are not saved when power is interrupted.
•
The current values are not refreshed when startup lock is in effect and when the gate
input is enabled but the gate input is OFF.
•
Measurement values for power supply voltages are always refreshed.
Heater 1 minimum current
*
min1
0100 to 2300
A
Heater 2 maximum current
*
max2
0100 to 2300
A
Heater 2 minimum current
*
min2
0100 to 2300
A
Maximum power supply
voltage
*
maxs
0085 to 0264
V
Minimum power supply
voltage
*
mins
0085 to 0264
V
Number of alarm outputs
acnt
0000 to 9999
Outputs
This value counts the total number of alarms output for heater burnout, SSR open and
short circuits, and heater layer shorts.
•
The count is refreshed each time an alarm is output, and it is saved in non-volatile
memory.
•
The value is saved when power is interrupted.
•
The number of outputs is not counted for the test function.
Processing value for alarm
output
memo
0100 to 2300
A
This holds the CT1 or CT2 processing value when a heater burnout alarm is output.
•
This is the most recent processing value, and it is refreshed each time a heater
burnout alarm occurs.
•
The value is not saved when power is interrupted.
Run time
otim
0000 to 9999
×
10h
This is the total run time value from when power is turned ON or the processing value is
reset until an alarm occurs.
•
The total time is recorded in non-volatile memory approximately once per hour. If
power is interrupted within the hour, however, the data since the beginning of the hour
is lost and the total starts over from when the time was last saved.
•
The total is stopped during heater burnout alarm output. When the alarm is cleared,
the total resumes from the time just before the alarm occurred.
Heater 1 input shift display
current
isc1
−
999 to 999
digit
This is the shift value for displaying the CT1 heater current measurement set in
measurement parameter CT1.
•
The value is saved when power is interrupted.
Heater 2 input shift display
current
isc2
−
999 to 999
digit
This is the shift value for displaying the CT2 heater current measurement set in
measurement parameter CT2.
•
The value is saved when power is interrupted.
Mode
Function
Alarm operation
Run Mode
This is the normal operating mode, used for receiving inputs, executing heater burnout outputs, etc.
Operation goes into Run Mode immediately after power is turned ON.
Executed
Adjust Mode
This mode is used to change comparatively frequently set parameters, such as alarm value settings.
This also the mode for entering the password to move to the Set Mode.
Stopped
Set Mode
This mode is used to make the initial settings for the various functions.
Stopped
Protection Settings
Mode
This mode is used to make settings to prevent unintended key operations. The protected modes are not displayed,
preventing changes to set values.
Stopped
Test Mode
This mode is used to simulate inputs with key operations to test alarm outputs.
Executed
Gate Mode
This mode sets the gate current value that stops an alarm or detection.
Executed
A B C D E F G H
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L M N O P Q R S T U V W X Y Z
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