EM8 User's Manual
1.Caution
2
Caution
●
The panel board, control circuit board, driving circuit boards installed the CMOS integrated circuit, when
using, please pay special attention, Directly with finger touch circuit boards, electrostatic induction it might
damage the circuit boards integrated chips.
●
Power on, please do not change wiring or remove the terminal wiring. Have the risk of damage to
equipment.
1.2 Precaution of use
In using of frequency inverter , please pay attention to following clause.
1.2.1 Motor insulation confirmation
When use inverter, please make sure motor insulation to avoid damaging other equipment. In the motor
environment is poor, please routine check the insulation of the motor to ensure the safety of the system.
1.2.2 Negative torque load
Such as load of lift and elevator is negative torque load, the system will feedback current to inverter, so
please consider to match optional braking resistor.
1.2.3 Mechanical resonance of load equipment
Inverter in certain output frequency range, may meet load mechanical resonance, must be set to avoid
jumping through this frequency.
1.2.4 The capacitor and piezoresistor of improving power factor of electricity
As the inverter output voltage is pulse wave, so the output side cannot connect capacitor and piezoresistor,
which will damage inverter, please take off. At same time, please do not add air switch and contactor on
output of inverter. For 1-1 diagram, (if you must add switch device, please make sure the inverter no output
current, and then you can take on-off switch).
Diagram 1-1
:
Prohibit to connect capacitor on output of inverter
1.2.5 To drop down KW because of basic frequency setting
When basic frequency setting is lower than rated frequency, please drop down the KW of matched motor in
avoiding motor overheat burnt.
1.2.6 Running upper 50Hz
If inverter output is upper 50Hz, except consider motor vibration, noise, please consider the rated speed of
your motor avoiding damaging motor.
1.2.7 Electronic thermal protection of motor
When properly matched motor, inverter has thermal protection for motor. If inverter is not proper
matched with motor, please adjust relative parameter to protect motor.
1.2.8 To drop down KW because of altitude
When the altitude is higher than 1000m, the inverter must be drop down to match motor because of thin air
poor the cooling effect. As diagram 1-2 is the relationship curve of inverter rated current and altitude.
