NORD Drivesystems BU0510 User Manual
Page 32
POSICON position control for NORD frequency inverters, SK 530E and above
32
Subject to technical alterations
BU 0510 GB-3911
3.4 Teach-In function via digital inputs or Bus I/O In Bits
As an alternative to the direct input, the parameterisation of the absolute setpoint position (position array) can
also be carried out via the function "Teach-In".
Two inputs are required for "Teach-In" via digital inputs or Bus IO In Bits. One input, or one of the parameters
P420
– P425, 470 or 480 must be parameterised to function (24) "Teach-In" and a further input must be
parameterised to function (25) "Quit Teach-In". "Teach-In" is started with the "1" signal to the relevant input
and remains enabled until the signal is cancelled again.
On a change from 0 to 1 of the signal "Quit Teach-In", the current position setpoint is saved in parameter P613
"Position". The position number or the position array element or the position increment array element is
specified via the position specification (bit 0 to 5 position (increment) array) of the digital inputs or Bus IO In
Bits in parameter P420
– P425, 470 or 480 with one of the functions (55 to 60) "Bit 0-5 for Position (Increment)
Array".
If no input is accessed (corresponds to position 0) the position number is generated via an internal counter.
The counter is increased after the adoption of each position. At the start of the "Teach-In" with specified
position 0 the counter is at 1. On adoption of the value with "Quit Teach-In" the counter is increased. As soon
as a position is addressed via the digital inputs, the counter is set to this position.
As long as the "Teach-In" is enabled, the frequency inverter can be controlled with enable signals and
frequency setpoints (identical to parameter P600 "Position Control" = "Off").
The function "Teach-In" can also be implemented via a serial interface or the Bus IO In Bits. For this, one of
the bus setpoint values (P546, P547 and P548 "Function Bus - Setpoints") must be set to "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.
3.5 Conversion ratio of the setpoint and actual values (P607 and P608)
The position values are based on the number of rotations of the motor. If a different reference value is
required, with the aid of parameter P607 [-03] the "Speed Ratio" and P608 [-03] the "Reduction Ratio" can be
converted into a different unit. No values after the decimal point can be entered in the parameters "Speed
Ratio" and "Reduction Ratio". In order to achieve greater precision, the two values should each be multiplied
by the same factor, which should be as large as possible. The product must not exceed the value 6500, i.e. the
factor must not be too large.
Example: Lifting gear
Unit in [cm]
Gear unit: i = 26.3
Drum diameter: d = 50.5 cm
Multiplier: 100 selected
Rev.
cm
cm
Ratio
P
ratio
Reduction
P
6
2630
15865
100
3
,
26
100
65
,
158
3
,
26
5
,
50
]
3
[
607
]
3
[
608
NOTE:
The required unit can be selected in parameter P640 "Unit Pos. Value". Accordingly, in this
example, parameter P640 must be parameterised to the function 4 = cm.