6 Parameter Settings and Functions
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6.4.9 Sensor break alarm
You can set the controller to send out an alarm when a sensor is not connected or disconnected
during temperature control. Sensor break can be confirmed through an external alarm output
contact, such as a buzzer or similar means.
Setting alarm output mode (alarm mode) to SBA will activate sensor break alarm.
Alarm output option can be set to standard alarm (AL-A) or alarm latch (AL-B).
6.4.10 Heater burnout alarm
When using a heater to raise the temperature of the control subject, the temperature controller
can be set to detect heater disconnection and send out an alarm by monitoring power supply to
the heater.
Heater disconnection is detected by the controller using a current transformer (CT), which
converts the current to the heater to a specific ratio (CT ratio) for monitoring. If the heater
current value (CT-A) measured by the CT is less than the heater detection setting value (Alarm
Low_CH), the heater burnout alarm will activate.
Heater burnout detection only takes place when the temperature controller's output is
turned on. Otherwise, heater burnout will not be detected by the controller.
Availability of the heater burnout alarm function is different by model and control output type.
Model Control output type Heater burnout alarm
TM□-□□R□ (Relay output) Relay output ○
TM4□-□□S□
(SSR drive output)
ON/OFF control ○
Cycle control X
Phase control X
TK2□-□□C□
(Current or SSR drive output)
Current output X
SSR drive output ○
Current detection is not performed if OUT control output time is less than 250 ms.
It is recommended to use Autonics designated current transformer (for 50 A).
Alarm output option can be set to standard alarm (AL-A) or alarm latch (AL-B).
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