RST FRC-F Series, Manual

Page: 112 / 140

9.581.140-6
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112
10.4 Particularities of the VVVF-controller during evacuation
Through a High level (+24V) on the digital input which has been configured accordingly (see Section
9.7.4.2.5 ), the VVVF controller is informed that Evacuation Operation is active.
The VVV-controller has a digital output
DigOut3
(terminal 56) through which the load situation after
opening of the brake are signaled.
•
High level (+24V): cabin is heavier than counterweight. recommended direction = DOWN
•
Low level (0V): cabin is lighter than counterweight. recommended direction = UP
Through an evaluation of this signal by the controller, the evacuation can be effected in the "easier"
direction.
In evacuation mode, the following applies:
•
Undervoltage monitoring of the intermediate circuit is suppressed.
•
Before issuing the travel commands, Evacuation Mode must be activated through the
digital input which has been configured accordingly..
•
The maximum speed is limited by the parameter VE (evacuation speed).
11 Service and maintenance
Modern electronic components have a long service life and are not subject to mechanical wear and
tear. Therefore, the VVVF controller normally needs no maintenance.
Within the range of the standard elevator maintenance, however, check the connectors for tight fit and
contacts of the output relays with regard to arc erosion.
At elevators in contaminated environments (chemical and similar industries), it may be necessary to
blow off dust and dirt from the printed circuit boards and power components in order to avoid creepage
current and flashover.
Also it might be necessary to remove dust from the ribs of the heat sink. In office and residential
buildings, however, this is normally not necessary.
Encoders which are not directly flanged to the machine or integrated in it, but only indirectly connected
to the motor shaft by a driving belt (in most cases toothed belts), regularly need to be checked with
regard to sufficient belt tension.