Sanyo MBR-704GR instruction manual Alarms & Safety Functions, Remote alarm terminal

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.

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Intermittent tone

Intermittent tone

Intermittent tone

Intermittent tone

Safety operation

Remote alarm

Remote alarm

Remote alarm Compressor ON. Heater OFF.

Remote alarm.

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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