Toshiba MCY-MHP0305HT-C Service Manual page 28

Item Description of operation, numerical data, and other information
8. IPDU 2. Heat sink temperature detection control
control 1) This control performs the IGBT overheat protection by the detection of the TH
(continued) sensor in Module IC200 for compressor driven in IPDU.
2) Increments the Fan operation mode by 1 when TH
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:
Outdoor unit
horse power
3 HP
4 HP
5 HP
5) Stops the compressor at TH
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.)
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.
9. Compressor
The compressor stops when the compressor case thermostat is activated.
case thermo
Whenever this condition occurs, a 1 count is added to the system error count.
control
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.
10. High
High pressure SW control
pressure SW
1) When the high pressure SW of an inverter compressor is activated, the
control
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.
TH (°C)
Zone 6
T0
Zone 5
T1
Zone 3 Zone 4
T2
Zone 2
T3
Zone 1
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.
T0 T1
112 °C 95 °C
112 °C. (By the control of Zone 6 above)
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85 °C is detected.
T2 T3
90 °C 85 °C
Remarks
IPDU is provided with a TH
sensor.
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.