A variable frequency drive is an electronic device that allows you to start, stop, and control the speed of a three phase motor. It is also a motor starter as it is equipped with overload protection. Read more »
What is the difference between a 'new surplus' motor and a 'factory new' motor?
Our New Surplus electric motors are offered at lower prices and come with our 90-day warranty.
Factory New products are competitively priced and come with a manufacturers warranty.
Variable frequency drives (VFDs or inverters) now play an important part in major industry.
Within the last 10 years they have been perfected to control and vary the speed of 3 phase electric motors. They serve many purposes, besides speed control. Homeowners and hobbyist alike, who have lathes or milling machines with a 3 phase motor, usually don't have 3 phase power to operate. These VFDs (instead of using a rotary phase converter) can now be used to convert single phase power to 3 phase power. Read more »
Digital references: 0.01Hz,
Analog references: 0.06Hz/60Hz
Output frequency resolution
Overload Tolerance rated output current
150%/1 min, 200%/2sec (C.T. mode), 120%/1 min (V.T. mode),factory setting of 150%/1 min, 200%/2 sec
Frequency setting signal
0 ~ +10VDC/4 ~ 20mA or -10VDC ~+10VDC and pulse–typefrequency command
0.0~6000.0 sec (separately set acceleration and deceleration times)
Voltage, frequency characteristics
Can set custom V/ F-curve based on parameters
Main control functions
Auto tuning, shaft lock, torque control, position control, droop control, soft-switching in PWM, over-voltage protection, dynamic braking, speed search, frequency traversing, instantaneous power fault restart, PID control, automatic torque compensation, slip compensation, RS-485 communicaton MODBUS standard, speed feedback control, simple PLC functionality, 2 sets of analog output, safety switch interlock
Additional control functions
Record of elapsed power-up and operation times, 4 most recent occurrences of faults and the most recent fault record, status, energy-saving function setting, single phasing protection, smart braking, DC braking, dwell, S-curve acceleration and deceleration, Up / Down operation, MODBUS communication type, scale pulse output, engineering unit display, Local/ remote switching keys, SINK/ SOURCE input interface options, stall protection Action: current can be set (in acceleration or constant speed state)
Threshold current can be set (in acceleration or constant speed, it can be set separately. In deceleration, it can be set on or off )
Instantaneous Over Current (OC) and output Short Circuit (SC) protection
Inverter shuts off when the current exceeds 200% of the inverter related current.
Inverter Overload protection (OL2)
Inverter rated current is 150%/1 min., at 200%/2 sec, inverter stops (C.T. type), carrier frequency factory setting is 8~2 kHz. At 120%/1 min, inverter stops (V.T. type), carrier frequency factory setting is 2 kHz.
Motor Overload (OL1) protection
Electrical overload protection curve
Over Voltage (OV) protection
When the main circuit DC voltage exceeds 410V (230V units)/ 820V (460V units), the drive faults out regardless of whether it is in run mode or stopped.
Under Voltage (UV)
When the main circuit DC voltage is under 190V (230V units)/ 380V (460V units), the drive faults out regardless of whether it is in run mode or stopped. The DC voltage trigger level can be adjusted.
Automatic restart after instantaneous power fault
Power fault exceeds 15 ms. This is programmable to 2 seconds.
Overheat protection (OH)
By direct temperature detection in the unit
Ground Fault protection (GF)
Uses current feedback for protection
Protection in charge state
When main circuit DC voltage exceeds 50V, the “CHARGE” LED is on.
Output Phase Loss Protection (OPL)
Automatically stops motor rotation and faults
Indoor (protected from corrosive gases and dust)
-10~+40°C without de-rating (IP20/NEMA1), -10~+50°C (IP00), with de-rating, its maximum operation temperature is 60°C
95%RH or less (no condensation)
Altitude and vibration
Altitude of 1,000 m (3,300 ft) or lower, vibration below 5.9m/ s2 (0.6G)
RS-485 standard with built-in (MODBUS) (RJ45)
UL, cUL, CE
The added noise filter complies with EM61800-3, 460V, 215 hp or below can be built-in.