Micro Speed - Siemens SINAMICS S120 Manual

3 DCC Blocks
SINAMICS
parameter
number
r21880 boOut_MasterswitchNull
r21881 boOut_
TravelCommandDirectionPositive
r21882 boOut_
TravelCommandDirectionNegative
r21883 SpeedSetpoint_
rOut_SpeedSetpoint
3.6

Micro Speed

Symbol
p21780
boEnable
p21782
rFactor
Brief description
The MicroSpeed block is used to scale the speed setpoint for precision positioning.
Mode of operation
Once p21780 (MicroSpeed_boEnable) is activated, the output r21883
(SpeedSetpoint_rOut_SpeedSetpoint) is multiplied by the factor p21782
(MicroSpeed_rFactor). For example, if p21782 (MicroSpeed_rFactor) is 0.10, and
the current traveling speed is 100% rated speed, once micro speed is activated the
drive will ramp down to 10% rated speed.
Connections
Table 3-6-1 Micro Speed connections
SINAMICS
parameter
number
p21780 boEnable
p21782 rFactor
Extended Crane Drive-Based Technology AC
Extended Crane Drive-Based Technology SINAMICS S120
DCC Add-On Description 109767457,
Name Connection
MicroSpeed
Name Connection
type
V1.2, 09/2019
Default
type assignment
OUT 0
OUT 0
OUT 0
OUT 0
SpeedSetpoint_rOut_SpeedSetpoint
Default
assignment
IN 0
IN 0.1
Data Meaning
type
BOOL Output
parameter for
when master
switch is at null
position
Output
BOOL
parameter for
when there is a
positive
direction travel
command
BOOL Output
parameter for
when there is a
negative
direction travel
command
REAL Effective speed
setpoint
r21883
Data Meaning
type
BOOL Enables micro speed
REAL Factor to scale speed
setpoint by
27