Pioneer WD Series, Service Manual

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2
I. Electrical Control of Inverter Air Conditioner
1. Main compositions of the electrical control of inverter air conditioner
The electrical control of inverter air conditioner is divided into indoor control system and outdoor
control system.
Relative to the fixed-speed air conditioner, the indoor control system is added with one
communication circuit, but removed of the control circuits for compressor, 4-way valve and
outdoor fan. The other circuits are basically the same.
The outdoor circuit is generally divided into three parts, i.e. outdoor power source board, Power
Factor Correction (
PFC
) board and Intelligent Power Module (
IPM
). The details are as follows:
PFC board Outdoor power source board
WT/WL- L I Inverter Air Conditioner Model 1 – 1.5P has been developed for four generations.
The 1
st
generation (V1) applies 120° square wave control plan and the all PFC plan is used for
power treatment.
The 2
nd
generation (V2) remains to apply 120° square wave control plan, but the partial PFC plan
is used for power treatment. This product is never put into batch production.
The 3
rd
generation (V3) applies 180° sine wave plan and partial PFC plan. This model is also few.
The 4
th
generation (V4) remains to apply 180° sine wave plan (including 2P unit), where only
significant adjustment is made to the function architecture. That is, the indoor control plan applied
for the 1
st
and 2
nd
generation is changed to outdoor control (For details on the function distribution,
please refer to the Control Function Chart below.
The 5
th
generation(V5), the function is same as V4, but the Power source board, PFC board and
IPM board have already integrated onto one board (All-In-One) for easily installation and
IPM board