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

High temperature

If the upper or lower temperature

ALARM lamp is flashed.

alarm

sensor senses a temperature 6oC.

Low temperature

If the upper or lower temperature

ALARM lamp is flashed.

alarm

sensor senses a temperature 2oC.

Over-temperature

If the high-temperature thermostat

Unit should already be in

sensor senses a temperature

alarm. No further indication

protection

approximately > 10 oC.

required.

Power failure

When the power to the unit is

ALARM lamp is flashed.

disconnected or power switch is

alarm

Temp. indication off

turned off.

 

 

Door alarm

When the door is ajar or open.

Door check lamp is lit.

 

 

 

Auto-return

When there is no key pressing in

Monitor bottle temperature is

each setting mode for 90 seconds.

displayed.

 

 

If the upper temperature sensor is

ALARM lamp is flashed.

Thermal sensor

E1 and monitor bottle temp. are

disconnected or short-circuited.

abnormality

displayed alternately.

 

 

If the lower temperature sensor is

ALARM lamp is flashed.

 

E2 and monitor bottle temp.

 

disconnected or short-circuited.

 

are displayed alternately.

 

 

 

If the defrost sensor is

ALARM lamp is flashed.

 

E3 and monitor bottle temp.

 

disconnected or short-circuited.

 

are displayed alternately.

 

 

 

If the over-temperature sensor is

ALARM lamp is flashed.

 

E4 and monitor bottle temp.

 

disconnected or short-circuited.

 

are displayed alternately.

 

 

Buzzer

Intermittent tone

Intermittent tone

Unit should already be in a high temp. alarm.

Intermittent tone

Intermittent tone with 2 minutes delay.

-----

Intermittent tone

Intermittent tone

Intermittent tone

Intermittent tone

Safety operation

Remote alarm

Remote alarm

Remote alarm Compressor ON. Heater OFF.

Remote alarm.

-----

Finishing of calibration mode.

Remote alarm.

Remote alarm.

Remote alarm.

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.

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Connecting terminal

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Sanyo MBR-704G Alarms & Safety Functions, Remote alarm terminal, Alarms and safety functions, Alarm test procedure

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