Lenze EVF9383 - Manual (Page 134)

Configuration
2−126
l
EDSVF9383V−EXT EN 2.0
2.4.41.4 Reset of the mains failure control
l The mains failure control is reset with MFAIL−RESET = HIGH (in the example, through terminal
X5/E5).
l The reset pulse is always required if:
– The restart protection is active.
– The restart protection is used and the supply (mains or DC supply) was switched on.
2.4.41.5 Dynamic adaptation of the control parameters
In special cases, a dynamic modification of the proportional gain may be useful. Two inputs
(MFAIL−CONST and MFAIL−ADAPT) are available for this purpose at the FB MFAIL. The resulting
proportional gain results from:
V
p
+ C0980 @
MFAIL−CONST * |MFAIL−ADAPT|
100 %
2.4.41.6 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, you can delay the restart by the retrigger time
C0983 or prevent it in combination 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. (
¶ 2−116)
l Because of a "short interruption" (KU) of the utility company (e.g. in a thunderstorm).
l Because of faulty components in the supply cables (e.g. slip−rings).
So set the retrigger time C0983 > the measured deceleration time achieved in braking operation.
2.4.41.7 Application example
Drive network with digital frequency coupling
Stop!
For drive networks which are connected via digital frequency (a master and one or more slaves):
l The mains failure detection and control must only be activated for the master.
– You must link the mains failure control into the signal flow to meet this requirement.
l You must operate all the controllers through the terminals +UG, −UG in a DC−bus
configuration. Observe the specifications in the chapter "Dimensioning".