20
AH-X079E/X099E
AY-X079E/X099E
2-3 Overcurrent protection
(1) Compressor lock detection
If the set value (3.0 A) of AC current is exceeded at 10 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 8.5 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 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 Power factor module
If a voltage error (over 400 V), current error (over 17 A), or temperature error (over 90
°
C) is detected in the power
factor module, 170 seconds the compressor is stopped.
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.
2-7 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.
