FU-425E
11)Fan motor drive circuit
The fan motor has four input terminals and one output terminal.
Vm: DC voltage input to be the source of motor rotation. (Vm = approx. DC311 - 339V)
(CN-C7 pin) Vm created by the power supply circuit is directly input and is constantly applied.
GND: Reference of the electric potential. All potentials such as Vm, Vcc, Vs, and PG indicate the
(CN-C5 pin) potential differences with GND.
Vcc: DC voltage input terminal to be the power supply for the circuit that is built in the fan motor.
(CN-C3 pin)During operation, it turns on Q43 and Q44 by outputting the " H " signal from the pin 21 of the
microcomputer LSI1 of the fan motor, and supplies the potential almost equal to VL to the Vcc
terminal (Vcc = approx. DC15V).
Vs: This input terminal controls the revolution speed of the fan motor (speed instruction signal).
(CN-C2 pin) After supplying Vcc during operation, the PWM (x/256?s) pulse is output from the pin 25 of the
microcomputer LSI-1 and smoothed in the circuit consisting of C41, R41-43, Q41 and Q42.
Then it goes through R46 and C43 to supply the DC voltage to the Vs terminal.
(Vs = approx. DC0 ~ 6V)
When speeding up revolution: the pulse width X is widened_ Vs voltage is increased
When slowing down revolution: the pulse width X is narrowed_ Vs voltage is decreased
PG: Fan motor revolution speed output terminal (feedback signal)
(CN-C1 pin) The pulse signal according to the revolution speed is output and it is input into the pin 24 of the
microcomputer LSI1 via the circuit consisting of R47, R44, R45, and C42.
The microcomputer recognizes the current revolution speed based on this PG signal, and controls
the Vs signal above to keep the speed to the designated level.
12)High-voltage unit drive circuit
The high-voltage unit is the power supply unit that supplies the high voltage to generate ion from the cluster
electrode, and it can be activated by inputting AC220V into it.
When the solid state relay SSR1 is turned on, the voltage for commercial power supply drops in the resistor R0
and and approximately AC90 ~ 110V is applied to the high-voltage unit.
During operation, it outputs " L " / " H " from the pin 39 of the microcomputer LSI-1, turns on and off Q123, and
controls and drives SSR1.
13)Relay drive circuit
This is a circuit that shall be operated by changing a relay switch for CLEAN / ION CONTROL in high voltage unit.
In clean mode: " H " is output from the pin 40 of the microcomputer LSI-1 and RY is turned on.
In cluster automatic operationenters the clean mode when the clean sign...... It
indicates the air is contaminated (orange or red).
In ion control modeoutputs " L " from the pin 40 of the microcomputer LSI-1, RY is turns off, thus generating: It
minus ion in large volume compared to plus ion.
In cluster automatic operationenters the refresh mode when the clean sign...... It
indicates the air is clean (green).
14)EEPROM circuit
During operation, data integrated with the operation time of the fan motor (dirtiness of the filter) is read and written
into EEPROM (IC1) using the repetitive signals of " H " and " L " that are input and output from the pins 6 and 7
of the microcomputer LSI-1.
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ACEC
