Control Techniques Digitax ST Advanced User's Manual page 26

Parameter
Menu 1
structure
Analog input scaling
The following diagrams show the scaling applied when analog inputs are used to define the reference and are routed via Pr 1.36 or Pr 1.37.
SPEED_FREQ_MAX
Pr 1.07
-100%
Pr 1.10 =0 ( unipolar mode)
Pr 1.08 =0 (
neg min ref disabled)
SPEED_FREQ_MAX
-100%
Pr 1.10 =0 ( unipolar mode)
Pr 1.08 =1 ( neg min ref enabled)
Reference limits
With reference to the block diagram for Menu 1 (Figure 5-1 on page 22) the following table shows the limits applied to the reference by various blocks
in the reference system. It should be noted that the minimum limit in the main reference limits block changes when either the jog reference or velocity
feedforward references are active.
When one of these is active:
if Pr 1.08 = 0 the minimum = -Pr 1.06 [-Pr 21.01 for motor map 2],
if Pr 1.08 = 1 the minimum = -Pr 1.07 [-Pr 21.02 for motor map 2].
Keypad control reference (Pr 1.17)
Bipolar/unipolar selector
Main reference limits
1.09 Reference offset select
Bit SP
Coding
1
Default 0
Background read when precision reference is active
Update rate
4ms read otherwise
When this parameter is 0 the reference is given by
Pr 1.01 = selected reference x (100 + Pr 1.38) / 100
and when this parameter is 1 the reference is given by
Pr 1.01 = selected reference + Pr 1.04
26
Keypad and
Parameter x.00
display
SPEED_FREQ_MAX
100% -100%
Pr 1.10 =1 (bipolar mode)
Pr 1.08 =0 ( neg min ref disabled)
SPEED_FREQ_MAX
100% -100%
Pr 1.10 =1 (bipolar mode)
Pr 1.08 =1 ( neg min ref enabled)
Minimum
Unipolar mode: Pr 1.07, or 0 if Pr 1.07 < 0
Bipolar mode: -SPEED_FREQ_MAX
Unipolar mode: Pr 1.07, or 0 if Pr 1.07 < 0
Bipolar mode: no limit applied
Neg minimum ref disabled: -Pr 1.06
Neg minimum ref enabled: Pr 1.07
FI DE Txt VM DP ND
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Parameter Advanced parameter
description format descriptions
100%
-SPEED_FREQ_MAX
100%
-SPEED_FREQ_MAX
Maximum
SPEED_FREQ_MAX
No maximum limit applied
RA NC NV PT US RW BU
1 1
Serial comms Electronic
protocol nameplate
Pr 1.06
PS
Digitax ST Advanced User Guide
Performance
Issue Number: 1