Emerson Digitax ST User Manual page 170

Safety Product Mechanical
installation
Information information
is carried out. If σL cannot be measured it can be calculated from
s
the steady state per-phase equivalent circuit of the motor as follows:
2
⎛ ⎞
L
m
σL L ⎜ --------- - ⎟
= –
s s
L
⎝ ⎠
r
I is the peak full scale current feedback = K
fs
is defined in Pr 11.32.
V is the maximum DC bus voltage.
fs
Therefore:
Pr 4.13 = Kp = (L / 167 μs) x (K
= K x L x K
C
Where:
K = [√2 / (0.45 x V x 167μs)] x (256 / 5)
fs
Drive voltage rating
200 V
400 V
This set-up will give a step response with minimum overshoot after a
step change of current reference. The approximate performance of the
current controllers will be as given below. The proportional gain can be
increased by a factor of 1.5 giving a similar increase in bandwidth,
however, this gives at step response with approximately 12.5 %
overshoot.
Switching Current control
frequency sample time
μs
kHz
3 167
4 125
6 83
8 125
12 83
The integral gain (Pr 4.14) is less critical and should be set so that
Pr 4.14 = Ki = Kp x 256 x T /
Where:
τ
is the motor filter (L / R).
m
R is the per phase stator resistance of the motor (i.e. half the
resistance measured between two phases).
Therefore
Pr 4.14 = Ki = (K x L x K ) x 256 x 167μs x R / L
C
= 0.0427 x K x R x K
The above equation gives a conservative value of integral gain. In some
applications where it is necessary for the reference frame used by the
drive to dynamically follow the flux very closely (i.e. high speed closed-
loop induction motor applications) the integral gain may need to have a
significantly higher value.
12.22.7 Start / stop logic modes
6.04 Start / stop logic select
RW Uni
0 to 4
This parameter is provided to allow the user to select several predefined
digital input routing macros to control the sequencer. When a value
between 0 and 3 is selected the drive processor continuously updates
the destination parameters for digital I/O T25, T26 and T27, and the
enable sequencer latching bit (Pr 6.40). When a value of 4 is selected
the destination parameters for these digital I/O and Pr 6.40 can be
modified by the user.
If Pr 6.04 is changed then a drive reset is required before the function of
T25, T26 or T27 will become active.
170
Electrical Getting Basic Running the
installation started parameters motor
x √2 / 0.45. Where K
C
x √2 / 0.45 / V ) x (256 / 5)
C fs
Vfs K
415V 2322
830V 1161
Gain Phase
bandwidth delay
Hz
TBA 1160
TBA 875
TBA 581
TBA 625
TBA 415
τ
m
C
US
0
EtherCAT SMARTCARD
Optimization
interface Operation
Pr 6.04 T25 (Pr 8.22) T26 (Pr 8.23) T27 (Pr 8.24)
Pr 6.29
0
(Fast Disable)
Pr 6.39
1
(Run Permit)
C
Pr 6.29
2
(Fast Disable)
Pr 6.39
3
(Run Permit)
User
4
programmable
If Pr 6.04 has been set to a value of 0 to 3, then setting Pr 6.04 to 4 does
not automatically reconfigure terminals T25, T26 and T27 to their default
functions. To return terminals T25, T26 and T27 to their default
functions, one of the following operations should be performed.
• Drive defaults should be restored. See section 5.6.6 Restoring
parameter defaults on page 46 for details.
• Manually set Pr 6.04 to 4, Pr 6.40 to 0, Pr 8.22 to 10.33, Pr 8.23 to
6.30, and Pr 8.24 to 6.32.
Figure 12-18 Digital input connections when Pr 6.04 is set
Pr 6.04 is set to 0
μs
+24V
Run Fwd
Run Rev
Pr 6.04 is set to 2
+24V
Run
Fwd/Rev
Key
6.40 Enable sequencer latching
RW Bit
OFF (0) or On (1)
Onboard Advanced Technical
PLC parameters Data
Pr 6.30 Pr 6.32
(Run Forward) (Run Reverse)
Pr 6.30 Pr 6.32
(Run Forward) (Run Reverse)
Pr 6.34 Pr 6.33
(Run) (Fwd/Rev)
Pr 6.34 Pr 6.33
(Run) (Fwd/Rev)
User User
programmable programmable
to 0 to 3
21
22
+24V
23
24
25 Run Permit
Run Fwd
26
Run Rev
27
28
29
30
31
21
22
+24V
23
24
25 Run Permit
Run
26
Fwd/Rev
27
28
29
30
31
Continuous contact
Momentary contact
Digitax ST User Guide
UL listing
Diagnostics
information
Pr 6.40
0
(Non Latching)
1
(Latching)
0
(Non Latching)
1
(Latching)
User
programmable
Pr 6.04 is set to 1
21
22
23
24
25
26
27
28
29
30
31
Pr 6.04 is set to 3
21
22
23
24
25
26
27
28
29
30
31
US
OFF (0)
Issue Number: 5