EM12 User’s Manual
1. Safety Information and Precautions
3
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 MΩ.
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 FVC and SVC mode). If the frequency inverter is required to run at over 50 Hz, consider the
bearable capacity of the machine.
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.
Содержание EM12 Series
Страница 5: ......