Toshiba MCY-MHP0806HT8-C Series Service Manual page 35

Item Description of operation, numerical data, and other information
10. A3-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 Q201 for compressor driven in A3-IPDU.
2) Increments the Fan operation mode by 1 when TH ≥75 °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 < 70 °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 ≥
6) The compressor restarts in 2 minutes and 30 seconds when the failure count is
incremented. The failure is confirmed when the count becomes "4". The check
code display is [P07]. (The compressor does not restart.)
3. Overcurrent protection control
1) When the overcurrent protection circuit on an A3-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 a failure count
of 1 recorded. If the compressor successfully operates for at least 10 minutes after
a restart, the failure count is cleared.
3) If the failure count reaches 8, the check code is confirmed as final.
11. 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 a failure count of 1 recorded.
2) The compressor is restarted 5 minutes later, and, if it successfully operates for at
least 10 minutes, the failure count is cleared.
3) If the failure reaches 4, the check code is confirmed as final. The check code
"P04" is displayed.
TH (°C)
Zone 6
T0
Zone 5
T1
Zone 3
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
100 °C 85 °C
100 °C. (By the control of Zone 6 above)
Zone 4
T2 T3
80 °C 75 °C
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Remarks
• A3-IPDU is provided with a
TH sensor.
• Connected to interface P.C.
board, the high-pressure
SW is normally closed.