ŶControl specifications
Item MDF-394/393(N)
Temp. controller Microcomputer control system
Temperature setting range: -50C㨪-90C (Unit: 1C)
Non-volatile memory
Thermal sensor Pt.1000ȍ
Temperature display LED digital display
Alarms
High temp.
+5C~+20C for High temperature alarm (Initial; +10C)
ALARM lamp blinks and buzzer sounds intermittently with 15min. delay
Remote alarm contact; Normal Open, Normal Close
Allowable contact capacity; Max. 30VDC, 2A
Low temp.
-5C~-20C for Low temperature alarm (Initial; -10C)
ALARM lamp blinks and buzzer sounds intermittently with 15min. delay
Remote alarm contact; Normal Open, Normal Close
Allowable contact capacity; Max. 30VDC, 2A
Filter check FILTER lamp blinks and buzzer sounds intermittently
Power failure
ALARM lamp blinks, buzzer sounds intermittently and remote alarm is
output.
Remote alarm
ޔRemote alarm terminal 3P; DC30V 2A
NC-COM, NO-COM
Battery lifespan
‘F1’ and PV are displayed alternately when battery accumulation time is
about 3 yrs
Fan motor lifespan
‘F2’ and PV are displayed alternately when fan motor accumulation time
is about 6 yrs
Control panel
Lamps: ALARM, FILTER CHECK
Buzzer key: BUZZER
Alarm test key: ALARM TEST
Set key: SET
Digit shift key:
Numerical value shift key:
Self diagnosis
When any failure is occurred in sensor among temp. sensor, filter
sensor, cascade sensor and AT sensor;
zError code and chamber temperature are displayed alternately
zALARM lamp blinks
zRemote alarm activates
zBuzzer sounds intermittently
Alarm resume time
The buzzer will be activated again after certain suspension if the alarm
condition is continued. (Initial; 30 minutes)
Compressor protection
When the cascade sensor temperature is lower than -34C, L side
compressor is turned on.
When the cascade sensor temperature is higher than -18C, L side
compressor is turned off.
When the filter sensor is higher than +60C, High side compressor is
turned off.
Overload relay for L side compressor, Internal thermometer for High
side compressor
㩷
2
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