Autonics TM4 Series - Sensor Disconnection Alarm; Heater Disconnection Alarm

6 Parameter Settings and Functions
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6.4.9 Sensor Disconnection 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 Disconnection 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 (C∙Tratio) for monitoring.
If the heater current value (CT-A) measured by the C∙Tis 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.
 Detection is only available in models with switching output
(relay, SSR 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).