In The Event Of Failure; Safety Device And Error Code - Yamato DNF 400 Instruction Manual

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
To prevent electric
Earth leakage
shock, To protect
breaker
over current
Sensor To prevent
overheating due to
trouble
sensor failure
detection
To prevent
Triac
overheating due to
short-circuit
impossibility of
detection
heater control
To notice failure in
Heater
temperature
disconnecting
detection
Independent
To prevent
overheating
overheating due to
prevention
controller failure
device
Purpose State
• Power shut off
• All indications
goes out
• Heater circuit
shut off
• Alarm buzzer
activated
• Heater circuit
shut off
• Alarm buzzer
activated
• Heater circuit
shut off
• Alarm buzzer
control
activated
• Heater circuit
shut off
• Alarm buzzer
activated

In the Event of Failure...

Display
None
TROUBLE lamp blinks
Sensor Error
Call a service
TROUBLE lamp blinks
SSR Error
Call a service
TROUBLE lamp blinks
SSR Error
Call a service
TROUBLE lamp blinks
Overheat Error
Call a service
59
Cause/Solution
Check the cause by
contacting to
service division.
• Temperature sensor is
broken or disconnected.
Check the cause by
contacting to
service division.
• Triac is in short-circuit
Check the cause by
contacting to
service division.
• Heater is disconnected.
Check the cause by
contacting to
service division.
• False
setting of
independent overheating
prevention device.
Set the device correctly.
• Overheating of sample.
Reduce the sample.
• Sensor
of
independent overheating
prevention device
disconnected, or failure
in the independent
overheating prevention
circuit.
Check the cause by
contacting to
service division.
our
our
our
our
the
the
is
our