Parameter
structure
Keypad and
display
Parameter x.00
Parameter
description format
Advanced parameter
descriptions
Serial comms
protocol
Electronic
nameplate
Performance
Menu 5
Digitax ST Advanced User Guide 81
Issue Number: 1 www.controltechniques.com
The rated voltage is used by the field controller to limit the voltage applied to the motor if high speed operation is required. Some headroom must be
left for the current controllers to operate, and so the drive will use the voltage level set by this parameter or the headroom limit whichever is the lower.
This parameter must be set correctly for the vector control algorithms to operate correctly. When auto is selected the number of poles is set to 6.
If this parameter is set to a non-zero value, the drive is enabled and a run command is applied in either direction the drive performs an auto-tune test.
All tests that rotate the motor are carried out in the forward direction if Pr 1.12 = 0 or the reverse direction if Pr 1.12 = 1. For example, if the test is
initiated by applying run reverse (Pr 6.32 = 1) the test is performed in the reverse direction. It should be noted however that the motor may jump in
either direction by up to half an electrical revolution at the start of the phasing test and then move in the required direction for the remainder of the
test. The test will not start unless the drive is disabled before the test is initiated by applying the enable or run, i.e. it will not start if the drive is in the
stop state. It is not possible to go into the stop state if Pr 5.12 has a non-zero value. (If Pr 5.12 is set to 6 then no test is carried out, but the current
loop gains are re-calculated. For these actions the drive does not need to be enabled.)
It is important that the motor is at standstill before the auto-tune test is performed if the correct results are to be obtained. The parameters modified by
the auto-tune tests are defined below when the second motor parameters are not selected (i.e. Pr 11.45 = 0). If the second motor is selected for the
duration of the tests (i.e. Pr 11.45 = 1), the second motor parameters in menu 21 are modified instead and not the parameters described below. When
the test is completed successfully the drive is disabled and will enter the inhibit state. The motor can only be restarted if the enable is removed either
from the enable input, or Pr 6.15 is set to zero or from the control word (Pr 6.42). As the tests progresses the calculated parameters are saved to
EEPROM as indicated. If for any reason the test fails, and the drive trips, no further parameters are calculated or stored in EEPROM. (If the drive is in
Auto or Boot copying modes (Pr 11.42 = 3 or 4) the parameters are also saved to the SMARTCARD where it is indicated that parameters are saved
to EEPROM.)
In this mode the following parameters are used in the vector control algorithm.
All these parameters can be set by the user. The motor set-up is constantly recalculated in the background task, therefore modifying these
parameters even after auto-tune will affect the performance of the drive. The auto-tune test can be used to overwrite the user or default settings as
described below. It should be noted that the current loop gains (Pr 4.13 and Pr 4.14) are not updated as part of any test if either the stator resistance
or the transient inductance for the active motor map are zero.
5.09 Rated voltage
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 111
Range 0 to AC_VOLTAGE_SET_MAX V
Default
200V rating drive: 230V
400V rating drive: EUR: 400V, USA: 480V
600V rating drive: 575V
690V rating drive: 690V
Second motor
parameter
Pr 21.09
Update rate Level 4 read
5.11 Number of motor poles
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range 0 to 60 (Auto to 120 POLE)
Default 3 (6 POLE)
Second motor
parameter
Pr 21.11
Update rate Background read
5.12 Autotune
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range 0 to 6
Default 0
Update rate Background read
Parameter
Required for good
performance
Required for excellent
performance
Encoder phase angle Pr 3.25 99
No. of poles Pr 5.11 99
Transient inductance (σL
s
)
Pr 5.24 9
Stator resistance (Rs) Pr 5.17 9
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