Sanyo MIR-554 - Alarms and Safety Functions

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ALARMS AND SAFETY FUNCTIONS
The unit has the alarms and safety function as shown in the table 1 below.
Table 1 Alarms and safety functions

Alarm Condition Display Buzzer Remote
contact
Safety operation
1 Auto-set temp.
alarm
When the chamber
temp. deviates from
set temp. by more
than 2.5
o
C.（±1.0〜
5.0
o
C changeable）
<Top screen>
The current chamber
temp. blinks.
Intermittent
tone with
delay
Alarm
status
with
delay
High stage side;
heater OFF
Low stage side;
compressor OFF
2 Upper limit alarm When the chamber
temp. is higher than
the upper limit temp.
―――
Continuous
tone
Alarm
status
Heater, fluorescent
lamp, fan motor
OFF
3 Lower limit alarm When the chamber
temp. is lower than
the lower limit temp.
―――
Continuous
tone
Alarm
status
Compressor OFF
4 Thermal fuse When the chamber
temp. is over 70
o
C
――― ―― −
Main heater and
sub-heater OFF
5 Thermal sensor
abnormality
Input voltage is over
70
o
C corresponding

Input voltage is lower
than -50
o
C
corresponding
<Top screen>
“E01:Temp. sensor
is opened.”
“E02:Temp. sensor is
shorted.”
Intermittent
tone
Alarm
status
Heater, fluorescent
lamp, fan motor
and compressor
OFF
6 Abnormal
completion of
defrosting
The temp. control
sensor is higher than
20
o
C during
defrosting
<Top screen>
“E03:Abnormal
completion of
defrosting.”
―― −
Forced finish of
defrosting
7 Short-circuit of
SSR or
compressor relay
Microcomputer
determines
triac/compressor relay
is shorted
<Top screen>
“E04:SSR or comp.
relay is shorted.”
Intermittent
tone
Alarm
status
――
8 Disconnection of
SSR
The heater is not
energized
<Top screen>
“E05:SSR is
open-circuited.”
Intermittent
tone
Alarm
status
――
9 Disconnection of
compressor relay
The compressor relay
is not energized
<Top screen>
“E06:Comp. relay is
open-circuited.”
Intermittent
tone
Alarm
status
――