ABB ACL30, Руководство пользователя

Страница: 235 / 360

Parameters 235
22.02 SPEED ACT FTIME Defines the time constant of the actual speed filter,
that is, the time within the actual speed has reached
63% of the nominal speed (filtered speed =
01.01
SPEED ACT).
If the used speed reference remains constant, the
possible interferences in the speed measurement
can be filtered with the actual speed filter. Reducing
the ripple with the filter may cause speed controller
tuning problems. A long filter time constant and fast
acceleration time contradict one another. A very long
filter time results in unstable control.
If there are substantial interferences in the speed
measurement, the filter time constant should be
proportional to the total inertia of the load and motor,
in this case 10…30% of the mechanical time
constant
t
mech
= ( n
nom
/ T
nom
) × J
tot
× 2 π / 60, where
J
tot
= total inertia of the load and motor (the gear ratio
between the load and motor must be taken into
account)
n
nom
= motor nominal speed
T
nom
= motor nominal torque
5.000 ms /
Real
0.000…
10000.000 ms Time constant for actual speed filter. - /
1000 = 1 ms
22.03 SPEED FB FAULT Selects the action in case of speed feedback data
loss.
Note: If this parameter is set to Warning or No , a loss
of feedback will cause an internal faulted state. To
clear the internal fault and to reactivate speed
feedback, use parameter
90.06 ENC PAR
REFRESH.
Fault /
enum
Fault Drive trips on a fault (OPTION COMM LOSS,
ENCODER FAILURE, ENCODER CABLE or SPEED
FEEDBACK depending on the type of problem). 0
Warning Drive continues operation with open loop control and
generates an alarm (OPTION COMM LOSS,
ENCODER FAILURE or SPEED FEEDBACK
depending on the type of problem). 1
No Drive continues operation with open loop control. No
faults or alarms are generated. 2
22.04 SPEED REF SEL
Selects the source for speed reference. INTERNAL /
enum
INTERNAL Speed reference based on parameter 80.06 , 80.07 ,
80.08 and 80.09 .
0
No. Bit/Name/Value/
Range Description Def/Type
FbEq
(16b/32b)