Parameter and variable descriptions – Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE User Manual
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PARAMETER AND VARIABLE DESCRIPTIONS
1557-UM050F-EN-P – June 2013
14 External Fault Parameters
A total of sixteen external fault inputs are provided. All sixteen can be sent from an external device via Remote
I/O. Any of the first eight external faults can use discrete hardware inputs instead. The first three hardware
fault inputs are standard and the remaining five require the optional discrete I/O. The class of each of the
external faults is specified by a corresponding parameter. Class 1 faults cause the drive to trip immediately.
Class 2 faults cause the drive to decelerate to a stop at the normal ramp rate before tripping. Class 3 faults are
merely warnings and cause no action to be taken. External fault messages are displayed on the terminal in the
same way as the permanent internal faults. The text of the external fault messages can be changed through
the terminal.
External Fault 1-16 Class [Ext flt 1-16 class]
Linear numbers:
209-224
Minimum value:
1
Maximum value:
3
Default value:
2
These 16 parameters specify the class of each of the external faults.
These parameters were deleted in Rev 4.10 and reinstated in Rev 4.55/5.00.
15 Autotune Parameters
Autotune Select [Autotune Select]
Linear number:
12
Minimum value:
0
Maximum value:
8
Default value:
0
This parameter specifies the autotuning function to be performed:
0
Autotuning off
1
Commutation inductance
2
DC link time constant
3
Commutation inductance and DC link time constant (1 & 2)
4
Motor stator resistance
5
Motor leakage inductance
6
Flux regulator
7
Total inertia
8
Flux regulator and total inertia (6 & 7)
The value of this parameter is set to zero after completion of the selected function.
Autotune Idc Command [Autotune Idc cmd]
Linear number:
124
Minimum value:
0.100 pu
Maximum value:
0.900 pu
Default value:
0.500 pu
This parameter specifies the dc current command used during autotuning of the dc link time constant. If the value
of this parameter is set too low, the dc link current may become discontinuous and the autotuning may produce
invalid results.
Autotune Idc Step [Autotune Idc stp]
Linear number:
125
Minimum value:
0.000 pu
Maximum value:
0.500 pu
Default value:
0.250 pu
This parameter specifies the value of the step that is added to the dc current command during autotuning of the dc
link time constant. If the value of this parameter is set too high relative to the dc current command, the dc link
current may become discontinuous and the autotuning may produce invalid results.