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1.4 Technical Specications
Table 1-2 Technical specications of MD500
Item Description
Standard
functions
Input frequency resolution Digital setting: 0.01 Hz
Analog setting: Max. frequency x 0.025%
Control mode Sensorless vector control (SVC)
Feedback vector control (FVC)
Voltage/Frequency (V/F) control
Startup torque ● 0.25 Hz/150% (SVC)
● 0 Hz/180% (FVC)
Speed range ● 1:200 (SVC)
● 1:1000 (FVC)
Speed stability accuracy ● ±0.5% (SVC)
● ±0.02% (FVC)
Torque control accuracy ● ±5% for 10 Hz above (SVC)
● ±3% (FVC)
Torque boost Customized boost 0.1 % to 30.0 %
V/F curve ● Straight-line V/F curve
● Multi-point V/F curve
● Square V/F curve
● Complete V/F separation
● Half V/F separation
Ramp mode ● Straight-line ramp
● S-curve ramp
Four separate acceleration/deceleration time settings in
the range of 0s to 6500s.
DC injection braking DC injection braking frequency: 0 Hz to max. frequency
DC injection braking active time: 0.0s to 36.0s.
Current level of DC injection braking: 0% to 100%.
Jog running Frequency range of jog running: 0.00 to 50.00 Hz
Acceleration/Deceleration time of jog running:0.0s to
6500.0s
Onboard multiple preset
speeds
The system implements up to 16 speeds by using
simple PLC function or by using digital input signals.
Onboard PID The system implements the proportional-integral-
derivative (PID) function in the closed-loop control.
Automatic voltage regulation
(AVR)
The system maintains a constant output voltage
automatically when the grid voltage changes through
the permissible range.
Overvoltage and overcurrent
stall control
The system limits the output current and voltage
automatically during operation to prevent frequent or
excessive trips.
Torque limit and control The system limits the torque automatically to prevent
frequent overcurrent tripping during operation.
Torque control is applied in vector control.