Emerson Digitax ST User Manual

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90 Digitax ST User Guide
Issue: 5
Table 9-89 0x604C vl_dimension_factor
The vl_target_velocity object is re-read every new profile cycle. It is
scaled to appropriate units using the vl_dimension_factor and
vl_setpoint_factor objects and then written to the drive preset reference
1 parameter (Pr 1.21).
The object vl_velocity_min_max is handled every profile cycle. The
vl_target_velocity is limited according to the values set in the object
vl_velocity_min_max, which is read every profile cycle. The object
vl_velocity_min_max_amount is mapped to vl_velocity_min_max.
The value of the vl_velocity_demand object is calculated in the
background. The option reads the value of parameter Pr 2.01 (post ramp
reference), scaled from RPM to user units using vl_dimension_factor
and vl_setpoint_factor, and writes the value to the vl_velocity_demand
object.
On a closed-loop drive, the speed feedback is read from the drive
internally every profile cycle, scaled to the same units as
vl_target_velocity and written to the vl_velocity_actual_value object. On
an open-loop drive, the estimated motor speed is read from Pr 5.04
(motor RPM) in the background, scaled to the units of vl_target_velocity
and written to the vl_velocity_actual_value object.
The vl_velocity_acceleration and vl_velocity_deceleration objects are
handled in the background. They are read, scaled to drive acceleration
units (depending on the drive operating mode), and written to the drive
acceleration rate and deceleration rate presets. In addition, if the drive
acceleration rate preset is changed, the vl_velocity_acceleration object
is updated, and if the drive deceleration rate preset is changed (Pr 2.21),
the vl_velocity_deceleration object is updated.
9.21 Profile torque mode
The profile torque mode is supported on the drive. In closed-loop servo
mode, this mode operates on the profile cycle time, using the drives
internal torque shortcut (which is read by the drive every 250 µs). When
using profile torque mode object 0x604A vl_velocity_quick_stop will be
used in the event of a quick stop (also for quick stop option codes 2 and
6 the 0x6049 vl_velocity_deceleration object will be used). Table 9-90
shows the objects that are supported:
Table 9-90 Profile torque mode supported objects
9.21.1 0x6071 Target_torque
This object indicates the configured input value for the torque controller
in profile torque mode. The value of this object is given per thousand of
rated torque.
Table 9-91 0x6071 Target_torque
9.21.2 0x6075 Motor_rated_current
This object indicates the configured motor rated current. It is taken from
the motor’s name-plate. Depending on the motor and drive technology
this current is DC, peak or rms (root-mean-square) current. All relative
current data refers to this value. The value of this object is given in mA.
Table 9-92 0x6075 Motor_rated_current
9.21.3 0x6078 Current_actual_value
This object provides the actual value of the current. It shall correspond to
the current in the motor. The value of this object is given per thousand of
rated current.
Table 9-93 0x6078 Current_actual_value
9.21.4 0x6087 Torque_slope
This object indicates the configured rate of change of torque. The value
of this object is given in units of per thousand of rated torque per second.
Table 9-94 Torque_slope
0x604C vl_dimension_factor
Sub-index 0
Access: RO Range: N/A
Size: Unsigned
8
Unit: N/A
Default: 2
Description: The number of sub-indices in this object.
Sub-index 1
Access: RW
Range: -32768
to +32767
Size: Signed 16 Unit: N/A
Default: 1
Description: vl_dimension_factor numerator (a value of 0 is not valid).
Sub-index 2
Access: RW
Range: -32768
to +32767
Size: Signed 16 Unit: N/A
Default: 1
Description:
vl_dimension_factor denominator (a value of 0 is not
valid).
Index Name
0x6071 Target_torque
0x6075 Motor_rated_current
0x6078 Current_actual_value
0x6087 Torque_slope
0x6071 Target_torque
Access: RW
Range: -32768
to +32767
Size: Signed 16
Unit: 0.1 % of
rated torque
Default: 0
Description:
Indicates the configured input value for the torque
controller in profile torque mode.
0x6075 Motor_rated_current
Access: RO
Range: 0 to
0xFFFFFFFF
Size:
Unsigned 32
Unit: mA
Default: 0
Description: Indicates the configured motor rated current (Pr 5.07).
0x6078 Current_actual_value
Access: RO
Range: -32768
to +32767
Size: Signed 16
Unit: 0.1 % of
rated current
Default: 0
Description: Provides the actual value of the current.
0x6087 Torque_slope
Access: RW
Range: 0 to
0xFFFFFFFF
Size:
Unsigned 32
Unit: 0.1 % of rated
torque per second
Default: 0
Description: Indicates the configured rate of change of torque.

Emerson Digitax ST Specifications

General

Brand	Emerson
Model	Digitax ST
Category	Controller
Language	English