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Operation explanation and applied data, etc.
11. IPDU (Inverter)
IPDU controls the inverter compressor by command
control
frequency, frequency up/down speed, and current
release control value from the interface P .C. board.
The main controls of IPDU control P .C. board are
described below.
(1) Current release control
The output frequency is controlled by AC input
current value which is detected by T02 on the
control P .C. board, to prevent the inverter input
current dropping lower than the specified value.
Current value
A zone : The normal operation is executed.
D zone : The present operation frequency is kept.
B zone : The operation frequency is decreased.
C zone : Decrease of the operation frequency
(2) Heat sink temp. detection control
1) The heat sink temp. is detected by the thermistor
2) When the inverter compressor driver stops, 1 is
NOTE:
When the error has been determined, the ambient
outdoor temp. or an outdoor fan error is considered.
(3) Over-current protective control
1) The compressor stops when T03 on IPDU control
2) When the compressor stops, 1 is counted to the
(4) High pressure SW control
1) The compressor driver stops when the inverter
2) When the compressor driver stops, 1 is counted
Outline of Control
Outdoor Units
B zone
(22A) I
1
D zone
(21.5A) I
2
A zone
stopped, and the present operation
frequency is kept.
in the compressor driving module Q200, and
the inverter compressor driver stops when
120°C is detected.
counted to the error count. If the error count
reaches 3 the system generates a fault code and
system operation stops.
P .C. board detects over-current.
error count, and the compressor reactivates after
2 minutes 30 seconds. After reactivation, the
error count is cleared if the operation continues
for 10 minutes or more.
compressor high pressure SW operates.
to the error count, and the compressor driver
reactivates after 2 minutes 30 seconds. After
reactivation, the error count is cleared if the
operation continues for 10 minutes or more.
39
Remarks
C zone
11
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