Control Techniques Digitax ST Advanced User's Manual page 31

Parameter Keypad and
structure display
1.36 Analog reference 1
1.37 Analog reference 2
Bit SP
Coding
Range ±SPEED_FREQ_MAX rpm
Default 0
Update rate 4ms write
Although most parameters can be controlled from analog inputs, these two parameters are a special case in that if an analog input is directed to one
of these parameters, the scan rate of that analog input is increased to 250μs as long as:
1. The reference must be derived via Pr 1.36 or Pr 1.37
2. The analog inputs must be in voltage mode with zero offset
3. Bipolar mode must be used or unipolar mode with the minimum speed (Pr 1.07) set to zero
4. No skip bands are enabled, i.e. Pr 1.29, Pr 1.31 and Pr 1.33 must be zero.
5. The jog and velocity feed-forward references must not be enabled.
These are special parameters when a non-bit type quantity uses these parameters as a destination (not just from analog inputs). The scaling and
limiting applied is as described with Pr 1.08 on page 25.
1.38 Percentage trim
Bit SP
Coding
Range ±100.00 %
Default 0.00
Update rate 4ms read
See Pr 1.09 on page 26.
1.39 Velocity feed forward
Bit SP
Coding
Range ±40,000.0 rpm
Update rate 4ms read
This parameter indicates the velocity feed forward reference when position control is used (see section 5.15 Menu 13: Position control on page 166).
1.40 Velocity feed forward select
Bit SP
Coding
1
Update rate 4ms write
This bit indicates that the position controller has selected the velocity feed forward as a reference for the drive.
Digitax ST Advanced User Guide
Issue Number: 1
Parameter
Parameter x.00
description format
FI DE Txt VM DP ND RA NC NV
1 1 1
FI DE Txt VM DP ND RA NC NV
2
FI DE Txt VM DP ND RA NC NV
1 1
FI DE Txt VM DP ND RA NC NV
1
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Advanced parameter Serial comms
descriptions protocol
PT US RW BU
1
PT US RW BU
1 1
PT US RW BU
1 1
PT US RW BU
1 1
Electronic
Performance
nameplate
PS
PS
PS
PS
Menu 1
31