Mitsubishi MS09NW Service Manual page 26

4.FAN OPERATION
(1)Press POWER ON/OFF button.
(2)Select FAN mode.
(3)Select the desired fan speed.When AUTO,it becomes Lo.(Only DRY operation.)
Only indoor fan operates.Outdoor unit does not operate.
5. FAN MOTOR CONTROL
(1) Rotational frequency feedback control
The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback
the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (Hi,Me,Lo) the
microprocessor controls SR11 and adjusts fan motor electric current to make the current rotational frequency close to the
target rotational frequency. With this control, when the fan speed is switched, the rotational frequency changes smoothly.
(2) Fan motor lock-up protection
When the rotational frequency feedback signal has not output for 12 seconds, (or when the microprocessor cannot detect
the signal for 12 seconds) the fan motor is regarded locked-up. Then the electric current to the fan motor is shut off. 3 min-
utes later, the electric current is applied to the fan motor again. During the fan motor lock-up, the operation indicator flash-
es to show the fan motor abnormality. (See page 32.)
6. AUTO VANE OPERATION
(1) Vane motor drive
MS series is equipped with a stepping motor for the vane. The rotating direction, speed, and angle of the motor are con-
trolled by plus signals (approx. 12V) transmitted from indoor microprocessor.
(2) The auto vane angle changes as follows by pressing the VANE CONTROL button.
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(MS09NW only)