This mode operates the motor at a preset target speed, similar to a frequency inverter. Unlike the profile velocity mode, this mode does not permit the selection of jerk-limited ramps.
The following bits in object 6040h (controlword) have a special function:
- Bit 8 (Halt): If this bit is set to "1", the motor stops. On a transition from "1" to "0", the motor accelerates with the acceleration ramp to the target speed. On a transition from "0" to "1", the motor brakes according to the deceleration ramp and comes to a standstill.
The following bits in object 6041h (statusword) have a special function:
- Bit 11: Limit exceeded: The target speed is above or below the set limit values.
The following objects are necessary for controlling this mode:
604Ch (Dimension Factor):
The unit for speed values is defined here for the following objects. If subindices 1 and 2 are set to the value "1", the speed is specified in revolutions per minute.
Otherwise, subindex 1 contains the multiplier and subindex 2 the divisor of the fraction by which the speed values are multiplied in revolutions per second to calculate the desired user unit, see User-defined units. Object 2060h is used to select whether the revolutions are electrical (2060h = 0) or mechanical (2060h = 1).
6042h: Target Velocity.The target speed is set here in user-defined units.
6048h: Velocity Acceleration
This object defines the acceleration. Subindex 1 contains the change in speed, subindex 2 the corresponding time in seconds. Both together are used to calculate the acceleration:
6049h (Velocity Deceleration):
This object defines the deceleration (deceleration ramp). The subindices here are arranged as described in object 6048h; the change in speed is to be specified with positive sign.
6046h (Velocity Min Max Amount):
The limitations of the target speeds are specified in this object.
604Ah (Velocity Quick Stop):
This object can be used to set the quick-stop ramp. Subindices 1 and 2 are identical to those described for object 6048h.
Speeds in Velocity Mode
Objects for Velocity Mode
The ramp generator follows the target speed, remaining within the set speed and acceleration limits. As long as a limit is active, bit 11 in object 6041h is set (internal limit active).