K8AC-H
11
Operation
Main K8AC-H Functions
The K8AC-H is a digital heater burnout detector that detects heater burnout by measuring the heater current from various power supply systems.
The K8AC-H provides the following functions.
Applicable Heater Control Methods
The following heater control methods can be used.
ON/OFF Control (Contactor/SSR)
Cyclic Control
Phase Control (Applicable to 4 to 20 mA Current-output
Temperature Controllers)
Heater Burnout Alarm
The preset burnout detection value is compared with the heater
current and an alarm is output accordingly.
Error Detection
The following errors are detected according to status.
Heater Layer Short Circuit Detection (overcurrent
detection).
Layer short circuits can be detected in the heater.
The preset overcurrent detection set value is compared with the
heater current and an alarm is output accordingly.
SSR Short Circuit Detection
If current is measured when there is no gate input, an SSR short
circuit error is detected and an alarm is output.
SSR Open Circuit Detection
If current is not measured during gate input, an SSR open circuit error
is detected and an alarm is output.
ON
1 to 99 s
OFF
ON
0.2 to 3.0 s
OFF
ON
Half cycle
OFF
500 ms
100 ms
Current
Set value
Alarm
Transistor output models: ALM indicator lit, ALM transistor output
Relay output models: ALM indicator lit, OR of all detection status output
Transistor output models: ALM indicator lit, ALM transistor output
Relay output models: ALM indicator lit, OR of all detection status output
Set value
Current
Alarm
Gate input
Current
measurement
Alarm
Transistor output models: SSR indicator lit, SSR transistor output
Relay output models: SSR indicator lit, OR of all detection status output
Gate input
Current
measurement
Alarm
Transistor output models: SSR indicator lit, SSR transistor output
Relay output models: SSR indicator lit, OR of all detection status output
