25 hp (18.5 kW) VFD, three phase 240V, 420V, 480V variable frequency drive, IP20, RS485 enabled, brand new direct sale by Chinese manufacturer with wholesale price.
Delivery date: 15 - 30 days
25 hp (18.5 kW) high performance variable frequency drive, three phase 240V, 420V, 480V for selection.
||25 hp (18.5 kW)
||3 phase 240V /420V /480V AC ±15% (Optional)
||3 phase AC 0~input voltage
|Over load capacity
||150% of rated current for 1 minute, 180% of rated current for 3 seconds
Sensorless vector control;
||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%
||5%-95%, without condensation
||≤1000m; VFD will be derated if above 1000m
|Impingement and oscillation
||Normal running:<5.9m/s2 (0.6g); Transportation:<15m/s2 (1.5g)
||–20℃~ +60℃; no dust, no corrosive gas, no direct sunlight
Tips: What kind of VFD is appropriate for running a high static inertia load?
The reason many variable frequency drives (VFD) have issues with high inertia loads has NOTHING to do with the VFD electronics but rather the motor components including all the mechanics. What happens is that the very large mass of the inertia makes the mechanics (shafts) act like springs. (Normally very stiff but now taxed with load). This brings the mechanical resonances down where the control loops want to operate. This is why normal VFD systems with large inertia loads can not have high gains. Gozuk, and others, offer VFDs that can drive motors with high inertia loads. These big diameter torques can eliminate all the 'springs'. If you are serious - focus on stiff mechanics.
Often beam pump controllers in the oil field are exposed to high transients, high overhauling loads along with power interruptions. Many of the VFDs have active front end so the harmonic signature is low and the overhauling energy can be placed back on to the grid. In case of a power failure all of these AFE VFDs have brake choppers and resistor banks installed to absorb the overhauling energy.
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