NORD Drivesystems BU0510 - Manual (Page 31)

3 Description of function
BU 0510 GB-3911 Subject to technical alterations 31
If the absolute setpoint position is specified via Bus IO In Bits, the position number results from bits 0…5 of the
serial interface. For this, a bus setpoint value (P546, P547 and P548 "Function Bus - Setpoints") must be set in
the setting "Bus IO In Bits 0...7" and the functions assigned to the corresponding bits under P480 "Function
Bus I/O In Bits".
For further details of the possible functionality settings, please refer to the relevant parameter description in
Section 4
Parameter settings.
3.3.2 Position increment array – relative setpoint position via digital inputs or BUS I/O In Bits
The position setpoint value "Position Increment Array" is especially advisable for endless axes. For this, the
function 1 = "Position Increment Array" must be parameterised in parameter P610 "Setpoint Mode". Up to 6
digital inputs or Bus IO Bits can each be assigned an input signal for one of the 6 position increment array
elements (P613 [-
01]…[-06]). With SK 540E and above, as many as 4 x 6 = 24 positions can be selected via
the dependency of parameter P613 on the parameter sets.
If the input signal changes from "0" to "1" the value of the element is added to the setpoint position. The values
can be positive or negative, so that a return to the starting position is also possible. The addition is carried out
on each positive signal flank, regardless of whether or not the inverter is enabled. A multiple of the
parameterised increment can be specified with several consecutive pulses to the allocated input. The pulse
width and the width of the pauses between pulses must be at least 10 ms.
If the relative setpoint position is specified via Bus IO Bits, bits 0...5 of the serial interface are each assigned to
the position increment array. For this, a bus setpoint value (P546, P547 and P548 "Function Bus - Setpoints")
must be set in the setting "Bus IO In Bits 0...7" and the functions assigned to the corresponding bits under
P480 "Function Bus I/O In Bits".
For further details of the possible functionality settings, please refer to the relevant parameter description in
Section 4
Parameter settings.
3.3.3 Bus setpoints
The transfer of the setpoint can be carried out via various field bus systems. The position can be specified in
terms of rotations or increments. A rotation of the motor then corresponds to a resolution of 1/1000 rotation or
32768 increments. The source of the bus setpoint must be selected in parameter P510 "Setpoint Source" in
the menu group "Additional Functions". The position setpoints to be transferred via the bus must be set in
parameters P546
– P548 "Function Bus Setpoints".
The High and Low words should be used in order to utilise the entire positioning range. With this, a 32 bit
position setpoint can be specified via a control unit.
Example: One motor rotation (See value P602) = 1.000 revolutions = Bus setpoint 1000
dec
.
For details of the bus setpoints, please refer to the relevant BUS operating instructions.
3.3.3.1 Bus - Specification of absolute setpoint via field bus
If the "Bus" setting (3) is parameterised in parameter P610 "Setpoint Mode", the absolute position setpoint
specification is exclusively made via a field bus system. The setting of the field bus system is parameterised
in parameter P509 "Interface". For the "Bus" setting, the functions of the digital inputs and the Bus IO In Bits
for the specification of the position from parameter P631 "Position" / position array element are not enabled.
3.3.3.2 Bus increments – specification of relative setpoint via field bus
If the "Bus Increment" setting (4) is parameterised in parameter P610 "Setpoint Mode", the relative position
setpoint specification is made via a field bus system. The setting of the field bus system is parameterised in
parameter P509 "Interface".