Emerson Mentor MP Advanced User's Manual page 53

Parameter Keypad and
structure display
Drive encoder filter
3.42
Bit SP
Coding
Range 0 to 5 (0 to16 ms)
Default 2
Update rate Background read
0 = 0ms, 1 = 1ms, 2 = 2ms, 3 = 4ms, 4 = 8ms, 5 = 16ms
A sliding window filter may be applied to the feedback taken from the drive encoder. This is particularly useful in applications where the drive encoder
is used to give speed feedback for the speed controller and where the load includes a high inertia, and so the speed controller gains are very high.
Under these conditions, without a filter on the feedback, it is possible for the speed loop output to change constantly from one current limit to the other
and lock the integral term of the speed controller.
Maximum drive encoder reference
3.43
Bit SP
Coding
Range 0 to 10,000 rpm
Default 1000
Update rate Background read
Drive encoder reference scaling
3.44
Bit SP
Coding
Range 0.000 to 4.000
Default 1.000
Update rate Background read
3.45 Drive encoder reference
Bit SP
Coding
Range ±100.0%
Update rate 4ms write
The drive encoder reference (Pr 3.45) gives the speed of the encoder input as a percentage of the maximum drive encoder reference provided that
the number of encoder lines per revolution (Pr 3.34) has been set up correctly. This may then be scaled and routed to any non-protected drive
parameter.
3.46 Drive encoder reference destination
Bit SP
Coding
Range 00.00 to 22.99
Default 00.00
Update rate Read on reset
The drive encoder input can be used as a reference to control a drive parameter. The drive encoder reference parameter (Pr 3.45) gives the speed of
the encoder input as a percentage of the maximum drive encoder reference provided that the number of encoder lines per revolution (Pr 3.34) has
been set up correctly. This may then be scaled and routed to any non-protected drive parameter.
3.47 Re-initialise position feedback
Bit SP
Coding
1
Update rate Background read
The encoder is re-initialised when this is set to 1 or encoder supplies are restored or a trip reset Pr 3.47 is automatically reset when re-initialisation is
complete. To allow detection of non initialised state Pr 3.48 remains zero for 500us.
Mentor MP Advanced User Guide
Issue Number: 1
Parameter description
Parameter x.00
format
FI DE Txt VM DP ND
1
FI DE Txt VM DP ND
FI DE Txt VM DP ND
3
FI DE Txt VM DP ND
1 1
FI DE Txt VM DP ND
1 2
FI DE Txt VM DP ND
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Advanced parameter
descriptions
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1 1
RA NC NV PT US RW BU
1 1
Serial comms
Performance
protocol
PS
1
PS
1
PS
1
PS
PS
1
PS
Menu 3
53