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3-2 Safety Function
This product has the safety functions, and displays alarm messages as described in the table shown below.
When any trouble is occurred, refer to Sec. 6, “Troubleshooting” and take appropriate measures.
Safety Functions
Safety Devices
Functions
Causes of Activations
Earth leakage
Breaker
When activated, the breaker is
turned off to cut the power supply.
Electric leakage or over-current occurred
Safety Valve for
Vacuum Pump
(Leak Valve)
This valve prevents the oil contained
in the pump flows into the vacuum
system where the valve is opened,
and the system is subjected to
the air.
Activated where the operation of the pump is
interrupted by any power failure or accident
during experiment.
Activated where freeze-drying is completed, thus
Auto operation is terminated. Or defrosting is
completed.
Activated where freeze-drying is completed, and then,
the pump is stopped by manual operation.
Overload relay
in Refrigerator
High Pressure
on Refrigerator
Switch
This feature stops the refrigerator and
turns off the Defroster Switch Lamp.
Also, the power to the plug socket
is cut off.
* Once the overload relay in refrigerator is activated, cool down the refrigerator until the relay recovers.
Turn on and off the power switch to restart the refrigerator.
Recovery time for the overload relay depends on conditions in use, so that it differs 3 to 40 minutes
Ambient temperature is too high.
Refrigerator filter is clogged.
Too many specimens are mounted at once.
Refrigerator starts (operates) under overload
Fan for the refrigerator does not operate
Low power supply voltage
Fuse for
Plug Socket
The fuse (rated 3.15 A) is blown
and the power to the product
is interrupted.
Self-diagnosis
feature for
Control Board
Alarm Messages
Causes of Alarms
Alarm Operations
Displays
Alarm Functions
Refrigerator
Alarm
Ref.Alarm
•Trap Temp. Display blinks
measured temp. value.
Ref. Alarm Lamp is lighted, and
the buzzer is sounded for 10 sec.,
Consequently, the whole
operation will be stopped.
This switch stops refrigerator and
turns off the Defroster Switch Lamp.
Also, the power to the plug socket
is cut off.
Ambient temperature is too high.
Refrigerator filter is clogged.
Too many specimens are mounted at once.
Refrigerator starts (operates) under overload
Fan for the Refrigerator does not operate
Any device rated 3.15 A or more is connected
to the equipment.
This feature detects any abnormal
status of the control board.
Buzzer is sounded continuously
and stops the execution of control.
Failure in the temperature regulator or an abnormal
status due to noise emission is detected.
So that execution of control is stopped totally.
Ambient temperature is too high (more than 35
C).
Noise affects adversely.
Holding circuit for overload
relay on refrigerator is activated.