– 81 –
11. A3-IPDU
control
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 control values for various outdoor units are shown below.
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.
• A3-IPDU1, 2 and 3 are each
provided with a TH sensor.
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.
• Connected to A3-IPDU, the
high-pressure SW is
normally closed.
Item
Description of operation, numerical data, and other information
Remarks
Zone C
Zone B
Zone A
Zone D
I
1
I
2
Current
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.
Outdoor unit
HP capacity
I
1
I
2
16
9.8
9.3
14
8.7
8.2
12
10.5
10.0
10
9.5
9.0
8
9.0
8.5
Содержание MMY-MAP0804HT7JP
Страница 23: ... 22 1 Wiring Diagrams 1 1 Outdoor Unit Models MMY MAP0804 MAP1004 and MAP1204 ...
Страница 24: ... 23 Models MMY MAP1404 and MAP1604 ...
Страница 35: ... 34 1 2 10 Slim Duct Type AP024 AP027 Models MMD AP0244SPH MMD AP0274SPH ...
Страница 38: ... 37 1 2 13 High Wall Type 3 series Models MMK AP0073H AP0093H AP0123H AP0153H AP0183H AP0243H ...
Страница 52: ... 51 2 5 Parts Layout in Outdoor Unit 8 10 12HP Model MMY MAP0804 MAP1004 MAP1204 ...
Страница 53: ... 52 14 16HP Model MMY MAP1404 MAP1604 ...
Страница 57: ... 56 2 7 2 Inverter P C board for compressor MCC 1596 A3 IPDU ...
Страница 323: ......