8-4. DOOR S/W sensing circuit
DOOR OPEN/CLOSE of F-room sensing is performed by connecting of CN30 to GROUND, supplying
Vcc (DC 5V) to through resistance R404 (4.7 ) and supplying ÒLowÓ (0V) / ÓHighÓ(5V) to MICOM by
DOOR OPEN/CLOSE of F-room.
DOOR OPEN/CLOSE of R-room sensing is performed by connecting of CN31 to GROUND, supplying
Vcc (DC 5V) to through resistance R403 (4.7 ) and supplying ÒLowÓ (0V) / ÓHighÓ(5V) to MICOM by
DOOR OPEN/CLOSE of R-room.
If there is any problem in DOOR S/W, Fan in the relevant room will not work and alarm function will
operate. So, DOOR S/W should be checked if there is any problem on A/S.
For FAN in the relevant room will stop on DOOR OPEN, if there is any problem in the contact point of
S/W, MICOM will judge that DOOR is opened and stop FAN operation, although DOOR is closed.
8-5. Temperature sensing circuit
SENSOR works on the basis of the characteristics of THERMISTOR with temperature coefficient of
negative resistance that resistance value decrease when temperature is High and resistance value
increase when temperature is low.
R306 ~ R310 and C302 ~ C306 are parts to prevent NOISE.
They have no relation with temperature sensing.
In case of F-SENSOR, when the voltage inputted to MICOM is considered to be Vf, Vf is (Rth Vcc)
/(R303 + Rth). In this equation, Rth is the resistance value of THERMISTOR corresponding to
temperature. See the conversion table of the resistance and voltage of sensor according to the
temperature in the Reference No. 8 of this manual. Use the table on A/S because MICOM Terminal
voltage is also described in the table.
Terminal
Voltage
MICOM
F-room
On DOOR CLOSE
On DOOR OPEN
5V (HIGH)
0V(LOW)
R-room
On DOOR CLOSE
On DOOR OPEN
0V (LOW)
5V(HIGH)
MICOM Terminal
Voltage
PIN #58 (F-SENSOR)
PIN #57 (R-EVA-SENSOR)
PIN #56 (R-SENSOR)
PIN #59 (F-EVA-SENSOR)
PIN #60 (AMBIENT-SENSOR)
Voltage in
MICOM
Terminal is
changed
according to
temperature.
AMBIENT
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