1. Safety Information and Precautions
EM12 User’s Manual
4
Note:
Do not connect the surge suppressor at the output side of the AC.
1.2.11 Altitude and de-rating
In places where the altitude is above 1000 m and the cooling effect reduces due to thin air, it is necessary to
de-rate the frequency inverter. Please contact our company for technical support.
1.2.12 Some special usages
If wiring that is not described in this manual such as common DC bus is applied, please contact the agent or our
company for technical support.
1.2.13 Disposal
The electrolytic capacitors on the main circuits and PCB may explode when they are burnt. Poisonous gas is
generated when the plastic parts are burnt. Please treat them as industrial waste.
1.2.14 Adaptable Motor
The standard adaptable motor is adaptable four-pole squirrel-cage asynchronous induction motor. For other types
of motor, select a proper frequency inverter according to the rated motor current. If user uses inverter for
permanent magnet synchronous motor, please contact my company for technical support.
The cooling fan and rotor shaft of non-variable-frequency motor are coaxial, which results in reduced cooling
effect when the rotational speed decreasing. If variable speed is required, add a more powerful fan or replace it
with variable-frequency motor in applications where the motor overheats easily.
The standard parameters of the adaptable motor have been configured inside the frequency inverter. It is still
necessary to perform motor auto-tuning or modify the default values based on actual conditions. Otherwise, the
running result and protection performance will be affected.
The frequency inverter may alarm or even be damaged when short-circuit exists on cables or inside the motor.
Therefore, perform insulation short-circuit test when the motor and cables are newly installed or during routine
maintenance. During the test, make sure that the frequency inverter is disconnected from the tested parts.
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