17
ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 2, and also self diagnostic functions.
Table 2 Alarms and safety functions
Alarm & Safety
Situation
Indication
Buzzer
Safety operation
High temperature
alarm
If the upper or lower temperature
sensor senses a temperature
≧
6
o
C.
ALARM lamp is flashed.
Intermittent tone
Remote alarm
Low temperature
alarm
If the upper or lower temperature
sensor senses a temperature
≦
2
o
C.
ALARM lamp is flashed.
Intermittent tone
Remote alarm
Over-temperature
protection
If the high-temperature thermostat
sensor senses a temperature
approximately > 10
o
C.
Unit should already be in
alarm. No further indication
required.
Unit should already
be in a high temp.
alarm.
Remote alarm
Compressor ON.
Heater OFF.
Power failure
alarm
When the power to the unit is
disconnected or power switch is
turned off.
ALARM lamp is flashed.
Temp. indication off
Intermittent tone
Remote alarm.
Door alarm
When the door is ajar or open.
Door check lamp is lit.
Intermittent tone with
2 minutes delay.
-----
Auto-return
When there is no key pressing in
each setting mode for 90 seconds.
Monitor bottle temperature is
displayed.
-----
Finishing of
calibration mode.
If the upper temperature sensor is
disconnected or short-circuited.
ALARM lamp is flashed.
E1 and monitor bottle temp. are
displayed alternately.
Intermittent tone
Remote alarm.
If the lower temperature sensor is
disconnected or short-circuited.
ALARM lamp is flashed.
E2 and monitor bottle temp.
are displayed alternately.
Intermittent tone
Remote alarm.
If the defrost sensor is
disconnected or short-circuited.
ALARM lamp is flashed.
E3 and monitor bottle temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Thermal sensor
abnormality
If the over-temperature sensor is
disconnected or short-circuited.
ALARM lamp is flashed.
E4 and monitor bottle temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Note:
The remote alarm is silenced by pressing the buzzer stop key (BUZZER) as the remote alarm is operated
in conjunction with the buzzer, except for the power failure alarm. All alarm functions will auto-reset.
The buzzer and remote contacts will re-activate if the condition which caused the alarm is not corrected
within 30 minutes.
Alarm conditions will remain active for about 24 hours on a fully charged back-up battery in the event of a
power failure. Two days operation is required to fully charge the battery after initial start-up if the power
has been off for an extended period.
The remote alarm contacts will remain active even if the battery is discharged.
Alarm test procedure
Press ALARM TEST key. The audible and visual alarm indicators activate along with the remote alarm
contacts. The alarm condition remains active for 90 seconds and then terminates automatically.
Otherwise the alarm test can be terminated manually at any time during the rest by pressing the ALARM
TEST key again.
Remote alarm terminal
The remote alarm terminal is located inside the front
cover. The alarm is outputted from this terminal.
Contact capacity is DC 30V, 2 A.
Contact output: At normal condition “Open”
At abnormal condition “Close”
Note:
The alarm is actuated when the power failure or the
power cord is disconnected from the outlet.
The remote alarm is silenced by pressing the buzzer
stop key (BUZZER) as the remote alarm is operated in
conjunction with the buzzer.
Connecting terminal
