Chapter 1 Safety Instructions
ET/EP/EH Series Intelligent Flexible Driver Manual
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necessary, use the appropriate step-up or step-down device to change the voltage.
1.3.6 Lightning surge protection
This series of inverter is equipped with lightning overcurrent protection device, which has certain
self-protection ability to resist lightning. For places with frequent lightning, customers should also
install additional protection at the front of the inverter.
1.3.7 Leakage protection
When the inverter operates with high-speed switching action, there is bound to be high-frequency
leakage current, which may lead to leakage protection circuit misoperation. When encountering the
above problem, in addition to appropriately reducing the carrier frequency and shortening the leads,
the leakage protector should be properly installed.
When installing the leakage protector, the following points should be noted:
The leakage protector is recommended to be set on the input side of the inverter and
placed after the air switch (fuseless circuit breaker).
Models insensitive to high harmonic or special leakage protectors for inverters shall be
selected for the leakage protectors. If ordinary leakage protectors are used, models with a
leakage current detection value above 200 mA and an action time above 0.1s shall be
selected.
1.3.8 Derating use
When the EH6 series ambient temperature is within 40℃, the inverter does not derate; when over
40℃, 1% of rated current decreases per 1℃, the maximum allowable temperature is 50℃;
When the EP6 and ET6 series ambient temperature is within 50℃, the inverter does not derate;
when over 50 ℃, 1% of rated current decreases per 1 ℃, the maximum allowable temperature is
60℃;
For areas within an altitude of 1,000 meters, it does not derate; when over 1,000 meters, 1% of rated
current decreases per 100 meters, and the maximum allowable altitude is 2,000 meters;
1.3.9 About the adaptive motor
This inverter is suitable for AC asynchronous motor, please make sure to match the inverter
according to the motor nameplate.
The built-in default motor parameters of the inverter are asynchronous motor parameters, but
according to the actual situation, it is necessary to identify the motor parameters or modify the
default value to meet the actual needs, otherwise the operation effect and protection performance
will be sacrificed.
Short circuit inside the cable or motor will trigger the inverter alarm or even cause damage.
Therefore, please first perform the insulation short circuit test on the motor and cable for newly
installed devices, and this test should be performed frequently in the daily maintenance. Note that
the inverter must be completely disconnected from the part being tested when doing this test.
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