—————— Instruction manual ——————
491
This event may be caused by the following:
- Field is physically disconnected from drive
-
DC Curr P base
value too low
- Enable and/or Start contacts open
- Autotune procedure interrupted from GF_eXpress via
Disable
button on Control Panel
- Failure causing disabling of drive
Following these events, parameter P1526 is set to 4 (No current).
"Tuning aborted"
This message is displayed if the autotune procedure is interrupted by pressing the
CANC
key on the keypad. The message remains displayed for a few seconds, after which the
message "End curr tune" is displayed. In addition, following this event, parameter P1526
is set to 3 (Aborted).
"Gains calc error"
This message is displayed if the autotune procedure encounters problems in reading
the best gains, especially integral gain. This is typically due to an excessively high
DC
Curr I base
value, so that in this case it is advisable to lower such value and repeat the
autotune procedure. In addition, following this event, parameter P1526 is set to 5 (Gain
calc err).
"Drive Failure"
This message is displayed if an alarm trips during the autotune procedure or is present
before it is run. Following this event, parameter P1526 is set to 6 (Drive Failure).
"Time out"
This message is displayed if the autotune procedure does not end by the maximum al
-
lowed time (50 minutes). Following this event, parameter P1526 is set to 7 (Timeout).
"Set Main cmd=Dig" This message is displayed if the autotune procedure is launched with parameter 252
Main Commands
set to Terminals.
"Set Ctrl=Local"
This message is displayed if the autotune procedure is launched with parameter 253
Control mode
set to
Bus
.
The autotune procedure tries to calculate the best values of parameters
CD factor P
,
CD factor I
,
DC Curr P
and
DC Curr I
, which allow a good compromise between fast current dynamics and limited overshoots. Parameter
CD curr thr
is set to 100. Parameter
DC Curr P base
and
DC Curr I base
are not changed.
Notes:
- If the nominal current of the connected field is significantly below the size of the drive, the values of
CD
factor P
and
CD factor I
are set to 1.
- If the values of
DC Curr I
or
DC Curr I
*
CD factor I
are equal to or near 100 at the end of the procedure,
you should raise the value of
DC Curr I base
(if not already at maximum) and repeat the procedure. On the
other hand, if
DC Curr I
is low (below 10), you should lower the value of
DC Curr I base
and repeat the
procedure.
- In some cases, especially if the nominal current of the field is less than half the size of the drive, there may
be lengthy (or improvable) rise times starting from zero current for reference values below 100% with gains
settings calculated by the autotune procedure. In this case, these times may be improved as follows:
a. Increase the value of
DC Curr I
by changing
CD factor I
in order to keep the value of
DC Curr I
*
CD factor I
constant.
b. Decrease the value of
DC Curr P
by changing
CD factor P
in order to keep the value of
DC Curr P
*
CD factor P
constant.
Содержание TPD32-EV-...-2B
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