Program features 105
The change rate is defined in 22.75 Motor potentiometer ramp time as the time it
would take for the value to change from the minimum (22.76 Motor potentiometer min
value) to the maximum (22.77 Motor potentiometer max value) or vice versa. If the up
and down signals are simultaneously on, the motor potentiometer value does not
change.
The output of the function is shown by 22.80 Motor potentiometer ref act, which can
directly be set as the reference source in the main selector parameters, or used as an
input by other source selector parameters, both in scalar and vector control.
The following example shows the behavior of the motor potentiometer value.
Settings
Parameters 22.71…22.80 (page 210).
Mechanical brake control
A mechanical brake can be used for holding the motor and driven machinery at zero
speed when the drive is stopped, or not powered. The brake control logic observes
the settings of parameter group 44 Mechanical brake control as well as several
external signals, and moves between the states presented in the diagram on page
106. The tables below the state diagram detail the states and transitions. The timing
diagram on page 108 shows an example of a close-open-close sequence.
Inputs of the brake control logic
The start command of the drive (bit 5 of 06.16 Drive status word 1) is the main control
source of the brake control logic.
Outputs of the brake control logic
The mechanical brake is to be controlled by bit 0 of parameter 44.01 Brake control
status. This bit should be selected as the source of a relay output (or a digital
0
1
0
1
0
22.80
22.74
22.73
22.77
22.76
22.75
ACS580 FW.book Page 105 Wednesday, September 21, 2016 9:48 PM
To Next Page
Loading...
