53
In the Event of Failure…
Function of safety devices
Safety device
Function
Action
Indication
Possible cause /
corrective action
Over current earth
leakage breaker
Prevents over current and
electric leakage.
Power source is cut off.
All indications lights off.
None
Check the cause by
contacting to our service
division.
Thermal fuse
Prevents overtemperature of
device surface
Heater circuit is cut off.
Warning buzzer
Combined with
heater cutoff
detector
Contact to our service
division.
Independent
overheating
prevention device
Prevents overtemperature
Heater circuit is cut off.
Warning buzzer
ERROR lamp
lights on.
Er.07
is indicated.
Overheating prevention
device trouble.
Contact to our service
division.
Sensor
abnormality
detector
Prevents overtemperature
due to sensor abnormality
Heater circuit is cut off.
Warning buzzer
ERROR lamp
lights on.
Er.01
is indicated.
Sensor disconnection.
Contact to our service
division.
Heater
disconnection
detector
Gives a warning against
temperature uncontrollability
Heater circuit is cut off.
Warning buzzer
ERROR lamp
lights on.
Er.03
is indicated.
Heater or thermal fuse
disconnection.
Contact to our service
division.
Triac short circuit
detector
Prevents overtemperature
due to heater
uncontrollability
Heater circuit is cut off.
Warning buzzer
ERROR lamp
lights on.
Er.02
is indicated.
Triac short circuit.
Contact to our service
division.
Main relay
defect detector
Gives a warning against
incapability
Heater circuit is cut off.
Warning buzzer
ERROR lamp
lights on.
Er.10
is indicated.
Main relay trouble.
Contact to our service
division.
POST function (*)
Checks electronic circuit
Heater circuit is cut off.
Warning buzzer
ERROR lamp
lights on.
Er.08
or
Er.14
is indicated.
Contact to our service
division.
Automatic
overheating
prevention
Prevents overtemperature
Heater circuit is cut off.
(in-furnace temperature:
rising)
None
High fever of sample.
Contact to our service
division.
Key lock
Prevents wrong operation
Input impossible in key
lock state except the
mode key
None
Activate during
operation to prevent
discontinuance due to
wrong operation.
Refer to the Page 38 to
set/release the function.
Memory backup
circuit
Stores memory in case of
power failure
None
*: The POST (Power On Self Test) function checks the microprocessor, memory, peripheral LSI and
peripheral circuit on the controller every time the power is turned on. It checks the existence of
fatal error on the controller before operation.