Emerson Mentor MP, Руководство для продвинутых пользователей

Страница: 182 / 222

Parameter description
protocol
Performance Menu 13
The local reference can be used to control the position of the motor shaft. If the local reference disable parameter is one the previously written value
The local reference consists of a turns, a position and a fine position value. When Pr 13.24 is zero the reference is a 48bit position made from these
Parameter
structure
Keypad and
format
Advanced parameter
descriptions
Serial comms
is used. This allows all three parts of the local reference position to be changed without data skew problems.
three values.
If Pr 13.24 is set to one the local reference is a 32bit position made from the position and fine position values. The position delta, used as the input to
the position controller, is calculated correctly even when the turns are ignored as the 32bit position is treated as a roll-over/roll-under counter. This
feature can be used, for example, with the local reference when only the position (and not the turns or fine position) is available. This feature is not
available when absolute mode is selected (Pr 13.11 = 1).
Mentor MP Advanced User Guide
179
Issue Number: 4 www.onxcontrol.com
13.22 Local reference fine position
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 1 1
Range 0 to 65,535
Default 0
Update rate 4 ms read
13.23 Local reference disable
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 1 1
Default 0
Update rate 4 ms read
13.24 Ignore local reference turns
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 1 1
Default 0
Update rate 4 ms read