NORD Drivesystems BU0710 - Manual (Page 18)

NORDAC SK 700E manual Posicon special extension
18 BU 0710 GB
3.3.6 Position increment array – Bus transmission of absolute setpoint position
Basically as 3.3.2, except that bits 0..6 of the serial interface are used to define the position increments.
The other bits can be used to control point-of-reference tracking, teach-in programming, and the "reset
position" function.
Bit 0: position array / position increment array
Bit 1: position array / position increment array
Bit 2: position array / position increment array
Bit 3: position array / position increment array
Bit 4: position array / position increment array
Bit 5: position array / position increment array
Bit 6: point-of-reference tracking
Bit 7: point of reference
Bit 8: teach-in
Bit 9: quit teach-in
Bit 10: reset position
3.4 Teach-in programming
Apart from entering them directly in terms of a position array, the setpoint positions can also be parameterised
using the "teach-in" programming function.
"Teaching-in" via input terminals involves two inputs on the customer interface or the positioning board being
assigned. Of these inputs one is programmed to execute the "teach-in" function and the other to execute the
"quit teach-in" function. "Teaching-in" is started applying a "1" signal to the chosen input. This command
remains active until the signal is removed. With a change of the "quit teach-in" signal from 0 to 1, the current
position value is stored as a setpoint position in the inverter memory.
The position number is defined using the option for digital input position setting. If no input is activated
(position 0), the position number is generated by an internal counter. The count will be increased each time a
position has been transferred to memory. When the "teach-in" programming function is started with a position
setting of 0, the count will be 1. When the value is stored with the "quit teach-in" digital input being energized,
the count is increased. As soon as a position is addressed via the digital inputs, the counter is set to the
number of this position.
While the "teach-in" programming function is active, the frequency inverter can be controlled by feeding to it
enable signals and frequency setpoints (in the same way as with the position control parameter set to OFF).
"Teach-in" programming can also be ensured via a field bus system. In that case the "Posicon control
terminals" setting will have to be selected for one of the bus setpoint modes (P546, P547, or P548).
3.5 Modes of position control (P600)
Positioning can be performed in either of two modes. They are different with regard to the way in which the
constant rate of progression during the positioning process is ensured. In one mode it is the frequency
(maximum frequency) set in parameter P105 which determines the rate at which the controlled unit is moving
on all through the process.
In the other the rate of constant progression can be selected by defining a setpoint in the usual way which
means that position and rate of displacement can be set independently of each other.