29
Safety Devices and Error Codes
This instrument incorporates an automatic diagnosis function built in the controller and safety
devices independent of the controller. The purposes and operations of the safety devices and
countermeasures are shown in the Table below. When an abnormal condition occurs, an error code
is displayed in the main display. Immediate action should be taken according to the specific
counter-measures.
Safety Device
Display
Cause & Counter-measures
1. Earth leakage breaker
No Display
⇒
Report to our service office and check the
cause of the problem
2. Motor thermal Protector
No Display
z
Heater
Overheating
⇒
Report to our service office
3. Sensor malfunction detector
TROUBLE lamp flashes
flashes
z
Break in temperature sensor circuit
⇒
Report to our service office
4. Triac circuit detector
TROUBLE lamp flashes
flashes
z
Short circuit in triac
⇒
Report to our service office
5. Disconnected heater circuit
detector
TROUBLE lamp flashes
flashes
z
Heater circuit is disconnected
⇒
Report to our service office
6. Fan malfunction detector
TROUBLE lamp flashes
flashes
z
Trouble in fan
⇒
Report to our service office
7. Independent overheating
prevention
TROUBLE lamp flashes
flashes
z
Incorrect setting of the independent
overheating prevention
⇒
Set correctly
z
Heating of sample
⇒
Reduce the amount of the sample
z
Malfunction of the independent overheating
prevention circuit
⇒
Report to our service office
8. Main relay malfunction
detector
TROUBLE lamp flashes
flashes
z
A malfunction of the main relay
⇒
Report to our service office
9. POST function*
TROUBLE lamp flashes
,
flashes
z
POST function is running (See the attached
instruction manual “Programmable controller
high-tech
Ⅳ
type”)
z
Contact Yamato Scientifics’ Technical
Service Department.
10. Door switch
flashes
z
The door is opened.
It is not the fault.
When opened the door,
will flash
on the sub display and the heater circuit will
be cut off and the fan will stop for safety.
Once closed the door,
will go out
and the heater circuit and the fan will
resume working.
11. Automatic overheating
preventive function
No Display
z
The function of overheating prevention in
controller.
When the temperature detected by sensor is
12
℃
higher than the target set temperature,
this function in the controller runs
automatically and the heating stops. When
the differences become less than 12
℃
, the
function is removed.
