Emerson Digitax ST User Manual

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56 Digitax ST User Guide
Issue: 5
reaches the programmed deceleration rate the controller ceases to
operate and the drive continues to decelerate at the programmed rate. If
the standard ramp voltage (Pr
2.08 ) is set lower than the nominal DC bus
level the drive will not decelerate the motor, but it will coast to rest. The
output of the ramp controller (when active) is a current demand that is fed
to the torque producing current controller (Servo mode). The gain of these
controllers can be modified with Pr
4.13 and Pr 4.14 .
2: Standard ramp with motor voltage boost
This mode is the same as normal standard ramp mode except that the
motor voltage is boosted by 20 %. This increases the losses in the
motor, dissipating some of the mechanical energy as heat giving faster
deceleration.
Setting Pr 0.16 to 0 allows the user to disable the ramps. This is
generally used when the drive is required to closely follow a speed
reference which already contains acceleration and deceleration ramps.
A first order filter, with a filter defined by Pr 0.17, is provided on the
current demand to reduce acoustic noise and vibration produced as a
result of position feedback quantization noise. The filter introduces a lag
in the speed loop, and so the speed loop gains may need to be reduced
to maintain stability as the filter is increased.
In modes 2 & 3 a current loop loss trip is generated if the current falls
below 3 mA.
In modes 2 & 4 the analog input level goes to 0.0 % if the input current
falls below 4 mA.
Pr 0.20 sets the destination of analog input 2.
In modes 2 & 3 a current loop loss trip is generated if the current falls
below 3 mA.
In modes 2 & 4 the analog input level goes to 0.0 % if the input current
falls below 4 mA.
Pr 0.22 determines whether the reference is uni-polar or bi-polar as
follows:
0.16 {2.02} Ramp enable
RW Bit US
Ú
OFF (0) or On (1)
Ö
On (1)
0.17 {4.12} Current demand filter
RW Uni US
Ú
0.0 to 25.0 ms
Ö
0.0
0.19 {7.11} Analog input 2 mode
RW Txt US
Ú
0 to 6
Ö
VOLt (6)
DC bus voltage
Motor Speed
Programmed
deceleration
rate
t
Controller
operational
Pr
value
Pr
string
Mode Comments
0 0-20 0 - 20 mA
1 20-0 20 - 0 mA
2 4-20.tr 4 - 20 mA with trip on loss Trip if I < 3 mA
3 20-4.tr 20 - 4 mA with trip on loss Trip if I < 3 mA
4 4-20 4 - 20 mA with no trip on loss 0.0 % if I ≤ 4 mA
5 20-4 20 – 4 mA with no trip on loss 100 % if I ≤ 4 mA
6 VOLt Voltage mode
0.20 {7.14} Analog input 2 destination
RW Uni DE PT US
Ú
Pr 0.00 to Pr 21.51
Ö
Pr 1.37
0.21 {7.15} Analog input 3 mode
RW Txt PT US
Ú
0 to 9
Ö
th (8)
Pr
value
Pr
string
Mode Comments
0 0-20 0 - 20 mA
1 20-0 20 - 0 mA
2 4-20.tr 4 - 20 mA with trip on loss Trip if I < 3 mA
3 20-4.tr 20 - 4 mA with trip on loss Trip if I < 3 mA
44-20
4 - 20 mA with no trip on
loss
0.0% if I ≤ 4 mA
5 20-4
20 - 4 mA with no trip on
loss
100 % if I ≤ 4 mA
6 VOLt Voltage mode
7th.SC
Thermistor mode with short-
circuit detection
Th trip if R > 3K3
Th reset if R < 1K8
ThS trip if R < 50R
8th
Thermistor mode with no
short-circuit detection
Th trip if R > 3K3
Th reset if R < 1K8
9 th.diSp
Thermistor mode with
display only and no trip
0.22 {1.10} Bipolar reference select
RW Bit US
Ú
OFF (0) or On (1)
Ö
OFF (0)
Pr 0.22 Function
0 Unipolar speed/reference
1 Bipolar speed/reference

Emerson Digitax ST Specifications

General

Brand	Emerson
Model	Digitax ST
Category	Controller
Language	English