7.5 hp (5.5 kW) VFD, single phase input & output, convert single phase to three phase. 110v-120v input, 220v-240v output, 23 amps.
||7.5 hp (5.5 kW)
|Dimension (W x H x D)
||1 phase 120V AC ±15%
||1 phase or 3 phase 220V AC ±15%
||V/F control; vector control
||Offer RS485 communication interface, support MODBUS-RTU communication protocol
||150% of rating torque at 1 Hz
|Speed control accuracy
||≤±0.5% of rating synchronous speed
||Digital setting: max frequency x± 0.01%;
|Analog setting: max frequency x± 0.2%
||Analog setting: 0.1% of max frequency;
|Digital setting: 0.01Hz
||Automatic torque boost, manual torque boost 0.1%~30.0%
|Interior PID controller
||Be convenient to make closed-loop system
|Automatic energy save running
||Optimize V/F curve automatically based on the load to realize power save running
|Automatic voltage regulation (AVR)
||Can keep constant output voltage when power source voltage varies.
|Automatic current limiting
||Limit running current automatically to avoid frequent over-current which will cause trip
||–10℃~ +40℃; VFD will be derated if ambient temperature exceed 40℃; each rise 1℃, the derate will be 5%
||smaller than 95%RH, non-condensation
||≤1000m; VFD will be derated if above 1000m
||Less than 5.9 m/s2 (0.6 g)
||forced air cooling
||–20℃~ +60℃; no dust, no corrosive gas, no direct sunlight
Tips: VFD motor protection
- Do you need an overload to protect the motor? And if so do you put in on the PWM output side?
- How should I protect the variable frequency drive and Motor?
Variable frequency driveVFD itself has many protection functions by working on variation of controlling voltage & current through open/close IGBT and detecting CT/ VT. Depend on size of VFD we can see on panel input/ output, DC voltage; input/ output current or can measure by tool; The basic function is overload protection by both setting normal 110% and trip 150% mode.
The variable frequency drive (VFD) can make the thermal protection. However you can also use a digital relay to make it. In that case the relay will be connected downstream the VFD. Such arrangement is used when one drive will control several motors. The only tricky point is that the frequency tracking in the relay shall use the current, whereas the usual technology is to use the voltage. But there exist relays using the current measurements for frequency tracking.
For the second question you need an upstream protection, which can be ultra-rapid fuses or circuit breaker with protection relay. Eventually, a good solution for LV VFD would be to add a line-choke upstream the VFD, this will reduce the current transients seen by the input of the VFD. In MV VFD there are usually input transformers for the VFD which realizes this function.