Yamato Scientific DNF 910 Constant Temperature Ovens - Manual (Page 63)

59
In the Event of Failure…
Safety Device and Error Code
This unit has an automatic diagnosis function built in the controller and safety devices independent of the
controller. The following table shows the purpose, operation and corrective actions against error of
safety devices. If an error occurs, the Main Display indicates the error code and the Sub Display displays
the error details/corrective actions with the buzzer sound. Correct the error according to the instruction.
Safety Device Purpose State Display Cause/Solution
Earth leakage
breaker
To prevent electric
shock, To protect
over current
• Power shut off
• All indications
goes out
None
™ Check the cause by
contacting to our
service division.
Sensor
trouble
detection
To prevent
overheating due to
sensor failure
• Heater circuit
shut off
• Alarm buzzer
activated
TROUBLE lamp blinks
Sensor Error
Call a service
• Temperature sensor is
broken or disconnected.
™ Check the cause by
contacting to our
service division.
Triac
short-circuit
detection
To prevent
overheating due to
impossibility of
heater control
• Heater circuit
shut off
• Alarm buzzer
activated
TROUBLE lamp blinks
SSR Error
Call a service
• Triac is in short-circuit
™
Check the cause by
contacting to our
service division.
Heater
disconnecting
detection
To notice failure in
temperature
control
• Heater circuit
shut off
• Alarm buzzer
activated
TROUBLE lamp blinks
SSR Error
Call a service
• Heater is disconnected.
™
Check the cause by
contacting to our
service division.
Independent
overheating
prevention
device
To prevent
overheating due to
controller failure
• Heater circuit
shut off
• Alarm buzzer
activated
TROUBLE lamp blinks
Overheat Error
Call a service
• False setting of the
independent overheating
prevention device.
™ Set the device correctly.
• Overheating of sample.
™
Reduce the sample.
• Sensor of the
independent overheating
prevention device is
disconnected, or failure
in the independent
overheating prevention
circuit.
™ Check the cause by
contacting to our
service division.