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8. IPDU
control
(continued)
2. Heat sink temperature detection control
1) This control performs the IGBT overheat protection by the detection of the TH
sensor in Module IC200 for compressor driven in IPDU.
2) Increments the Fan operation mode by 1 when TH 85 °C is detected.
Increments the Fan operation mode by 1 per 5 seconds to the maximum
hereinafter.
3) Returns to the normal fan mode control at TH < 80 °C after 2).
4) Controls the output frequency by the TH sensor value so that the IGBT
temperature does not become a given value, in addition to 1) - 3).
The following table shows the temperature control value for each outdoor unit's
horse power:
5) Stops the compressor at TH 112 °C. (By the control of Zone 6 above)
6) The compressor restarts in 2 minutes and 30 seconds when the error count is
incremented. The error is confirmed when the count becomes "4". The error
display is [P07]. (The compressor does not restart.)
IPDU is provided with a TH
sensor.
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.
The compressor stops when the compressor case thermostat is activated.
Whenever this condition occurs, a 1 count is added to the system error count.
After a period of 5 minutes, the compressor is reactivated and the error count
cleared if the operation continues without further error for a period of 10 minutes
or more.
If the error count reaches 4, the check code [H04] is displayed.
The case thermostat is
normally closed and
connected to interface P.C.
board.
Connected to IPDU P.C.
board, the high-pressure
SW is normally closed.
Item
Description of operation, numerical data, and other information
Remarks
Zone 1: Normal operation.
Zone 2: Slower frequency rising speed than normal.
Zone 3: Maintains the current frequency.
Zone 4: Maintains the current frequency.
Zone 5: Reduces the frequency.
Zone 6: Stop the operation.
TH (°C)
Zone 1
T0
T1
T2
T3
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Outdoor unit
horse power
T0
T1
T2
T3
3 HP
112 °C
95 °C
90 °C
85 °C
4 HP
5 HP
9. Compressor
case thermo
control
10. High
pressure SW
control
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 5 minutes 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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