Function block library
7-157
SHB9300CRV EN 2.0
7.6.48.5 Dynamic adaptation of the control parameters
In special cases, a dynamic modification of the proportional gain may be useful.For this, two inputs
(MFAIL-CONST and MFAIL-ADAPT) are available at the function block MFAIL. The resulting
proportional gain results from:
V
p
C0980
ô
MFAIL-CONST
|MFAIL-ADAPT|
100 %
7.6.48.6 Fast mains recovery (KU)
The fast mains recovery causes a restart of the controller unless the restart protection is active.The
drive accelerates to its setpoint.If this is not wanted, the restart can be delayed via the retrigger time
C0983, or avoided together with the restart protection.
A fast mains recovery occurs:
l
due to the system, the mains recovery is indicated by the mains failure detection via the level
of the DC bus voltage (see Chapter 7.6.48.1).
l
because of a ”short interrupt” (KU) of the utility company (e.g. in case of thunderstorms).
l
because of faulty components in the supply cables (e.g. slip rings)
Set the retrigger time C0983 higher than the measured deceleration time during braking.
7.6.48.7 Application example
Drive network with digital frequency coupling
Stop!
In drive networks which are connected via pulse trains (a master and one or more slaves):
l
the mains failure detection may only be activated for the master.
– the mains failure control must be integrated correspondingly into the signal flow.
l
All controllers must be operated in the DC bus connection via the terminals +UG,
-UG.Observe the specifications in the chapter “Dimensioning”.
Tip!
Further information and predefined configurations can be obtained from Lenze.
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