EM11 User’s Manual
1. Safety Information and Precautions
3
1.1.6 During operation
Danger
Do not go close to the equipment when selected the restart function. Failure to comply may result in
personal injury.
Do not touch the fan or the discharging resistor to check the temperature. Failure to comply will result
in personal injury.
Signal detection must be performed only by qualified personal during operation
Warning
Avoid objects falling into the frequency inverter when it is running. Failure to comply will result in
damage to frequency inverter.
Do not start/stop the frequency inverter by turning the contactor ON/OFF. Failure to comply will result
in damage to the frequency inverter.
1.1.7 Maintenance
Danger
Do not repair or maintain the frequency inverter at power-on. Failure to comply will result in electric
shock.
Repair or maintain the frequency inverter only after the charge light on frequency inverter is powered
off. This allows for the residual voltage in the capacitor to discharge to a safe value. Failure to comply
will result in personal injury.
Repair or maintenance of the frequency inverter may be performed only by qualified personnel. Failure
to comply will result in personal injury or damage to the frequency inverter.
1.2 General Precautions
1.2.1 Motor insulation test
Perform the insulation test when the motor is used for the first time, or when it is reused after being stored
for a long time, or in a regular check-up, in order to prevent the poor insulation of motor windings from
damaging the frequency inverter. The motor must be disconnected from the frequency inverter during the
insulation test. A 500-V mega-Ohm meter is recommended for the test. The insulation resistance must not
be less than 5 M
Ω
.
1.2.2 Thermal protection of motor
If the rated capacity of the motor selected does not match that of the frequency inverter, especially when
the frequency inverter's rated power is greater than the motor's, adjust the motor protection parameters on
the operation panel of the frequency inverter or install a thermal relay in the motor circuit for protection.
1.2.3 Running at over 50 Hz
The frequency inverter provides frequency output of 0 to 3000 Hz (Up to 300 Hz is supported if the
frequency inverter runs in VC and SVC mode). If the frequency inverter is required to run at over 50 Hz,
consider the bearable capacity of the machine.
1. Safety Information and Precautions
EM11 User’s Manual
4
1.2.4 Vibration of mechanical device
The frequency inverter may encounter the mechanical resonance point at some output frequencies, which
can be avoided by setting the skip frequency.
1.2.5 Motor heat and noise
The output of the frequency inverter is pulse width modulation (PWM) wave with certain harmonic
frequencies, and therefore, the motor temperature, noise, and vibration are slightly greater than those motor
runs at grid power frequency (50 Hz).
1.2.6 Voltage-sensitive device or capacitor at output side of the Frequency inverter
Do not install the capacitor for improving power factor or lightning protection voltage-sensitive resistor at
the output side of the frequency inverter because the output of the frequency inverter is PWM wave.
Otherwise, the frequency inverter may suffer transient over current and even to be damaged.
1.2.7 Contactor at the Input/Output side of the frequency inverter
When a contactor is installed between the input side of the frequency inverter and the power supply, the
frequency inverter must not be started or stopped by switching the contactor on or off. If the frequency
inverter has to be operated by the contactor, ensure that the time interval between switching is at least one
hour. Since frequently charge and discharge will shorten the service life of the capacitor inside of
frequency inverter.
When a contactor is installed between the output side of the frequency inverter and the motor, do not turn
off the contactor when the frequency inverter is active. Otherwise, IGBT modules inside of frequency
inverter may be damaged.
1.2.8 When input voltage is over rated voltage range
The frequency inverter must not be used over the allowable voltage range specified in this manual.
Otherwise, the frequency inverter's components may be damaged. If required, use a corresponding voltage
transformer device.
1.2.9 Prohibition of three-phase input changed into two-phase input
Do not change the three-phase input of the frequency inverter to two-phase input. Otherwise, a fault will be
result or the frequency inverter will be damaged.
1.2.10 Surge suppressor
The frequency inverter has a built-in voltage dependent resistor (VDR) for suppressing the surge voltage.
For frequently surge place, please add extra surge voltage protection device at input side of frequency
inverter.
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.
