Velocity Profile

116

Getting started

Velocity Profiles

The X200 inverter is capable of sophisticated speed control. A graphical representation of that capability will help you understand and configure the associated parameters. This manual makes use of the velocity profile graph used in industry (shown at right). In the example, acceleration is a ramp to a set speed, and deceleration is a decline to a stop.

Speed

Set speed

 

Accel Decel

0

t

Acceleration and deceleration settings specify

Speed

Maximum speed

 

the time required to go from a stop to maximum

 

 

 

 

 

frequency (or vise versa). The resulting slope

 

 

 

 

 

(speed change divided by time) is the

 

 

 

 

 

acceleration or deceleration. An increase in

 

 

 

 

 

output frequency uses the acceleration slope,

0

 

 

 

 

while a decrease uses the deceleration slope.

 

 

 

 

t

 

 

Acceleration

The accel or decel time a particular speed

 

 

(time setting)

 

 

change depends on the starting and ending

 

 

 

 

 

 

 

 

 

 

frequencies.

 

 

 

 

 

However, the slope is constant, corresponding to the full-scale accel or decel time setting. For example, the full-scale acceleration setting (time) may be 10 seconds – the time required to go from 0 to 60Hz.

The X200 inverter can store up to 16 preset

Speed

 

 

speeds. And, it can apply separate acceleration

Speed 2

 

and deceleration transitions from any preset to

 

 

 

Speed 1

 

any other preset speed. A multi-speed profile

 

 

(shown at right) uses two or more preset speeds,

0

 

 

which you can select via intelligent input

 

 

 

Multi-speed Profile

t

terminals. This external control can apply any

 

 

 

preset speed at any time.

Alternatively, the selected speed is infinitely variable across the speed range. You can use the potentiometer control on the keypad for manual control. The drive accepts analog 0-10VDC signals and 4-20 mA control signals as well.

The inverter can drive the motor in either direction. Separate FW and RV commands select the direction of rotation. The motion profile example shows a forward motion followed by a reverse motion of shorter duration. The speed presets and analog signals control the magnitude of the speed, while the FWD and REV commands determine the direction before the motion starts.

Speed

Forward move

 

0

t

 

 

Reverse move

Bi-directional Profile

NOTE: The X200 can move loads in both directions. However, it is not designed for use in servo-type applications that use a bipolar velocity signal that determines direction.

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Image 36
Hitachi X200 Series instruction manual 16, Velocity Profiles