Frequency Converters

Frequency Converters

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25 Hp (18.5kW) VFD, 3 Phase 240V, 420V, 480V

25 Hp (18.5kW) VFD, 3 Phase 240V, 420V, 480V
25 Hp (18.5kW) VFD, 3 Phase 240V, 420V, 480V
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$992.18
$1,149.00
Ex Tax: $992.18
  • Stock: In Stock
  • Model: HZTOHZ-G37
  • Weight: 1.00
  • SKU: HZTOHZ-G37

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25 hp (18.5 kW) high performance variable frequency drive, three phase 240V, 420V, 480V for selection.

Specification:

BasicsModelGK3000-4T0185G/ GK3000-2T0185G
Capacity25 hp (18.5 kW)
Shipping weight18 kg
Dimension423*258*230 mm
I/O FeatureRated current37A at 380V ~ 480V, 75A at 220V ~ 240V
Input voltage3 phase 240V /420V /480V AC ±15% (Optional)
Input frequency50Hz/ 60Hz
Output voltage3 phase AC 0~input voltage
Output frequency0.00~400.00Hz
Over load capacity150% of rated current for 1 minute, 180% of rated current for 3 seconds
Control FeatureControl modeV/F control;
Sensorless vector control;
CommunicationRS485
Speed regulation1:100
Start torque150% of rating torque at 1 Hz
Speed control accuracy≤±0.5% of rating synchronous speed
Frequency precisionDigital setting: max frequency x± 0.01%;
Analog setting: max frequency x± 0.2%
Frequency resolutionAnalog setting: 0.1% of max frequency;
Digital setting: 0.01Hz
Torque boostAutomatic torque boost, manual torque boost 0.1%~30.0%
Interior PID controllerBe convenient to make closed-loop system
Automatic energy save runningOptimize 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 limitingLimit running current automatically to avoid frequent over-current which will cause trip
EnvironmentEnclosure ratingIP 20
Temperature–10℃~ +40℃; VFD will be derated if ambient temperature exceed 40℃; each rise 1℃, the derate will be 5%
Humidity5%-95%, without condensation
Altitude≤1000m; VFD will be derated if above 1000m
Impingement and oscillationNormal running:<5.9m/s2 (0.6g); Transportation:<15m/s2 (1.5g)
Store environment–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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