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11. A3-IPDU
control
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Description of operation, numerical data, and other information
IPDU controls inverter compressors by issuing commands relating to compressor
speeds, speed increases/decreases, and current release control values via the
interface P.C. board.
The main control functions of the IPDU P.C. board are described below.
1. Current release control
To prevent inverter input current from exceeding the specified value, output
frequency is controlled with AC input current as detected by T02 mounted on the
control P.C. board.
Current
I
1
I
2
Zone A:Compressors are operated normally.
Zone D:The current operating frequency is maintained.
Zone B:Operating frequency is lowered.
Zone C:The lowering of operating frequency is halted
to maintain the current frequency.
Current control values for various outdoor units are shown below.
Outdoor unit
HP capacity
16
14
12
10
8
2. Heat sink temperature detection control
1) This control function is aimed at protecting IGBT from overheating via a thermistor
(TH sensor) mounted in the compressor drive module (Q201) of A3-IPDU.
2) When TH
85 °C is detected, the fan operation mode is raised by one step,
followed by a series of additional step-ups right up to the highest mode at a rate of
one step/5 seconds.
3) After step 2), the normal fan mode is restored when TH falls to < 85 °C.
4) When TH
105 °C, compressors are shut down.
5) Compressors are restarted 2 minutes and 30 seconds later, with an error count of
1 recorded. If this is repeated four times (error count reaches 4), the error is
confirmed as final. The error [P07] is displayed. (There will be no more restarts.)
* Possible causes of the confirmed error include a heat buildup in the outdoor unit, fan
abnormality, blockage of the cooling duct, and IPDU P.C. board fault.
* The TH temperature used in this control function is the highest registered by A3-
IPDU1, A3-IPDU2, and A3-IPDU3.
3. Overcurrent protection control
1) When the overcurrent protection circuit on an IPDU P.C. board detects an
abnormal current, the compressor is shut down.
2) The compressor is restarted 2 minutes and 30 seconds later, with an error count
of 1 recorded. If the compressor successfully operates for at least 10 minutes after
a restart, the error count is cleared.
3) If the error count reaches 8, the error is confirmed as final.
4. High pressure SW control
1) When the high pressure SW of an inverter compressor is activated, the
compressor is shut down with an error count of 1 recorded.
2) The compressor is restarted 2 minutes 30 seconds later, and, if it successfully
operates for at least 10 minutes, the error count is cleared.
3) If the error count reaches 4, the error is confirmed as final. The error "P04" is
displayed.
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Zone B
Zone C
Zone D
Zone A
I
I
1
2
9.8
9.3
8.7
8.2
10.5
10.0
9.5
9.0
9.0
8.5
83
Remarks
• A3-IPDU1, 2 and 3 are each
provided with a TH sensor.
• Connected to A3-IPDU, the
high-pressure SW is
normally closed.
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