AIR-TO-WATERHEATPUMP MAINTENANCE
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3 DIAGNOSIS OF DRIVING
（1）Overvoltage of direct current bus: It is detected that the voltage of direct current
bus is over 420V after energization. If the protection occurs for 6 times within one hour, it
can not be resumed unless it is deenergized and reenergized.
（2）Under-voltage of direct current bus: It is detected that the voltage of direct
current bus is lower than 200V after startup of the unit. . If the protection occurs for 6 times
within one hour, it can not be resumed unless it is deenergized and reenergized.
（3）PFC abnormality: The protection against PFC abnormality is detected after the
PFC works for 10s. If the protection occurs for 6 times within one hour, it can not be
resumed unless it is deenergized and reenergized.
（4）IPM protection of driving: The protection against IPM abnormality is detected
after the IPM works for 10s. If the protection occurs for 6 times within one hour, it can not
be resumed unless it is deenergized and reenergized.
（ 5 ） Overcurrent protection of compressor: The protection occurs when the
instantaneous current is detected over 45A. If the protection occurs for 6 times within one
hour, it can not be resumed unless it is deenergized and reenergized.
（6）Superheat protection of IPM driving: The protection occurs when the internal
temperature of IPM is detected higher than 105 degree. If the protection occurs for 6 times
within one hour, it can not be resumed unless it is deenergized and reenergized.
（7）Abnormal sensor of radiating fin: The protection occurs when break circuit or
short circuit of the temperature sensor on top of the IPM module. If the protection occurs
for 6 times within one hour, it can not be resumed unless it is deenergized and
reenergized.
（8）Communication error of conversion driver and main controller: the driving can
not communicate with the main controller normally. This error can be resumed
automatically.
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