Fujitsu Airstage V series Service Manual page 3

3. INVERTER CONTROL
3-1 INVERTER CONTROL...............................................................................................
3-1-1 What is Inverter...................................................................................................
3-1-2 Inverter Block of Outdoor Unit.............................................................................
3-1-3 Basic Circuit of 3 Phase Inverter.........................................................................
3-1-4 PWM Control (General Consideration)..............................................................
3-2 CIRCUIT DESCRIPTION............................................................................................
3-2-1 Filter PCB............................................................................................................
3-2-2 Current Transformer............................................................................................
3-2-3 Power Relay & Resistor.......................................................................................
3-2-4 Coil (Reactor)......................................................................................................
3-2-5 Smoothing Capacitor........................................................................................... 03-03
3-2-6 IGBT (Insulated Gate Bipolar Transistor)...........................................................
4. OUTDOOR UNIT OPERATION CONTROL
4-1 INPUT / OUTPUT LIST..............................................................................................
4-2 COMPRESSOR OPERATION....................................................................................
4-2-1 Operation / Stop Condition.................................................................................
4-2-2 Capacity Control.................................................................................................
4-2-3 Frequency Range of Start,Stop,and Operation...................................................
4-2-4 Oil Return Control................................................................................................
4-2-5 Compressor Sequence Operation.......................................................................
4-3 FAN CONTROL.......................................................................................................... 04-05
4-3-1 Cooling Operation...............................................................................................
4-3-2 Heating Operation...............................................................................................
4-3-3 Snow Falling Protection Fan Mode.....................................................................
4-4 EXPANSION VALVE CONTROL............................................................................... 04-06
4-5 SPECIAL OPERATION.............................................................................................. 04-06
4-5-1 Oil Recovery Operation......................................................................................
4-5-2 Oil Balance Operation........................................................................................
4-5-3 Pre-Heat Operation............................................................................................ 04-08
4-5-4 Defrost Operation Control.................................................................................. 04-09
4-6 PROTECTIVE FUNCTION........................................................................................ 04-10
4-6-1 Protective Function List......................................................................................
CONTENTS
03-01
03-01
03-01
03-02
03-02
03-03
03-03
03-03
03-03
03-03
03-03
04-01
04-02
04-02
04-02
04-03
04-03
04-04
04-05
04-05
04-06
04-06
04-07
04-10