－41－
５．
Alarm/Safeguard
５－１
Alarm
（１）Ｅ１：
High Temp. Alarm
When the internal temperature reaches 45
℃
(factory setting), the alarm lamp will light and the alarm output
terminals will break and make contact as set in AS and Ao (See the assignment table of alarm output terminals in
page 38).
The display shows the current internal temperature and E1 by turns to indicate that the internal
temperature is too high. Cooling operation will be continued.
When the internal temperature falls to 43
℃
(factory setting) or lower, the alarm output contact returns to the
original state and the alarm lamp turns off.
（２）Ｅ３：
Radiation Error Alarm
If the cooling unit radiates too much heat due to some problems like clogged filters or fins or fan failure, the overheat
detector in the refrigerant circuit is activated to stop cooling operation. The alarm lamp will light and the alarm
output terminals will break and make contact as set in AS and Ao (See the assignment table of alarm output
terminals in page 38).
The display shows the current internal temperature and E3 by turns to indicate abnormal
radiation.
Press the SET button of the operation panel for more than 3 seconds to cancel the alarm.
Turn off the power and clean the filters and the fins or replace the fan. IF the error has been resolved, Compressor
Cooler will restart normaly.
（３）Ｅ４：
Maintenance reminder
When the cumulative operating hour reaches the set value, the alarm lamp will light and the alarm output terminals
will break and make contact as set in AS, Ao and Fo (See the assignment table of alarm output terminals in page 38).
Current internal temperatures and E4 are displayed by turns to remind you to carry out maintenance work. Cooling
operation will be continued.
Press the SET button of the operation panel for more than 3 seconds to cancel the alarm.
Turn off the power and maintenance of filter and others.
Change of the parameter for this function makes the cumulative hours by that time zero and operating hours are
counted anew.
（４）Ｅ５：
Temperature Sensor Disconnection Alarm
Cooling operation will stop in the event of disconnection of the internal temperature sensor for some reasons. The
alarm will light and the alarm output terminals will break and make contact as set in AS and Ao (See the
assignment table of alarm output terminals in page 38).
The display shows E5.
In the event of this failure, turn off the power immediately and contact our Technical Support Department.
（５）Ｅ８：
Type Error
Contact our Technical Support Department.
（６）ＳＥ：
System Error
This error occurrs when the parmeters cannot be read correctly due to a memory fault. The display shows SE only.
The alarm lamp will light and the alarm output terminals will break and make contact as set in AS and Ao (See the
assignment table of alarm output terminals in page 38).
In the event of this failure, turn off the power immediately and contact our Technical Support Department.
５－２
Safeguard
As a safeguard, this product is designed to stop operation under an abnormal current or a temperature.
In this event, the alarm E1 or E3 will occur.
