VB3/V5/VB5 series inverter
4
Mechanical resonance point of load
The inverter may
encounter the mechanical resonance point of load within certain output frequency range. Jump frequen-
cies have to be set to avoid it.
Capacitor and resistor
Because the inverter output pulse wave, capacitor and resistors shouldn't be connected with the output terminals of the in-
verter, or the inverter may trip or components may be damaged; Besides, don’t connect switch components such as air
switch and contactor with the output terminals is recommended, as shown in Fig.0-1(If switch components need to be
connected with the output terminals, make sure output current of the inverter is zero when switch is acting).
Fig.0-1
Capacitor is prohibited to be connected with
output terminals of inverter
Derate according to basic frequency setting
When the basic frequency is lower than the reference frequency, please consider duration for the motor so as to avoid mo-
tor’s damage caused by overheating.
Running at frequency above 50Hz
If running at frequency above 50Hz, besides the increment of vibration and noise, the ranges of running speed of motor
shaft and mechanical device have to be guaranteed. Be sure to make an enquiry first.
The electro-thermal protective value of motor
If the applicable motor is selected as per requirements, the inverter can perform the thermal protection to the motor. If the
ratings of applied motor are not in compliance with the inverter, be sure to adjust the protective value or adopt other pro-
tective measures to guarantee the safe running of motor.
Altitude and derate
When the altitude is higher than 1000m, the cooling effect of inverter is deteriorated because of the rareness of air, deration
must be considered, shown in Fig.0-2 which indicates the relationship between the altitude and rated current of frequency
inverter.
Fig. 0-2
The relationship between the altitude and rated
current of frequency inverter
