AH-X127E
AU-X127E
AY-X127E
AE-X127E
25
2-3 Overcurrent protection
(1) Compressor lock detection
If the set value (4.25 A) of AC current is exceeded at 17 to 30 Hz when operation begins, operation is stopped. In this
case, the compressor outdoor fan does not stop, and 170 seconds after operation is stopped, another try will be made.
Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and the outdoor
unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the outdoor unit will not
function; therefore, do not cancel by removing the plug and cutting the power.
(2) DC overcurrent detection, AC overcurrent detection
To protect against overcurrent due to sudden changes in load, the compressor is stopped if the set value 30 A DC is
exceeded in the DC section, or the set value 15 A AC is exceeded in the AC section. In this case, the outdoor fan does
not stop, and 170 seconds after operation is stopped, another try will be made. Three retries are allowed. On the fourth
retry, a complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is
performed. At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by
removing the plug and cutting the power.
2-4 Compressor protector control
If the temperature of the compressor chamber exceeds 114°C, the compressor is stopped. In this case, the outdoor fan
does not stop, and when the compressor chamber temperature decreases to 100°C three minutes after operation is
stopped, another try will be made. Three retries are allowed. On the fourth retry, a complete stop request signal is sent
to the indoor unit, and the outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for
control of the outdoor unit will not function; therefore, do not cancel by removing the plug and cutting the power.
2-5 Power transistor module protector
If the temperature of the chips in the power transistor module exceeds 105 °C, the compressor is stopped. In this case,
the outdoor fan does not stop, and when the temperature of the chips in the power transistor module decreases to 105
°C 170 seconds after operation is stopped, another try will be made. Three retries are allowed. On the fourth retry, a
complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is performed.
At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by removing the
plug and cutting the power.
2-6 Serial signals
(1) Serial signals consist of all 96-bit signals.
(2) If the outdoor unit does not receive a serial signal, it will stop approximately 30 seconds later. Note that this is true only
of normal operation; in test mode, it does not stop and operation takes place based on the test mode commands.
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