48 von 54
Version 2.0 (04/2019) Online
Translation of the original operating manual
Troubleshooting
8.2
Deviations in the conveying process
Removing a package from the detection area of the zone sensor
The zone sensor is freed by manual intervention (withdrawal or removal of a package that has already stopped) or
by sliding back:
The ZoneControl detects this state and let the RollerDrive run for 2 seconds in the zone in order to move the package
back into the detection area of the zone sensor. Within the 2 seconds there is no signal sent via the PTP link to the
upstream zone that the zone is free. This is to prevent an other package from moving in the zone. If the sensor is
not occupied by a package within 2 seconds, a free signal is sent to the upstream zone (the ZONE_STATUS signal
becomes in-active).
Time-out when leaving the zone sensor
A package does not leave the current detection zone of the zone sensor or does not reach the target area of the
downstream zone (e g. by temporary removal of the package). This can be caused by a blockage on the conveyor
track, for instance by the package becoming snagged or a barrier on the conveyor track.
Once the RollerDrive has started, the occupied zone sensor must become free after 5 seconds. If the sensor is still
occupied at the end of this time period, the RollerDrive stops. The ERROR output becomes active and the next
ZoneControl displays an error by means of the error LED. An assumption is made that the package is blocking the
conveyor.
The time period of 5 seconds can result in long packages not being able to be conveyed at a slow speed.
The error can be reset by pushing the package manually into the detection area of the zone sensor in the downstream
zone. By doing this, a zone sensor that did not become free, should no longer be occupied. After elimination of the
fault, the affected zone runs a local initialisation.
Time-out when reaching the zone sensor
As soon as a package has left the detection area of a zone sensor, the package has 5 seconds time to occupy the
zone sensor in the subsequent zone. This means that the RollerDrive in the following zone runs for at least 5 seconds,
providing its zone sensor is not previously occupied. At the end of the 5 seconds, the ZoneControl assumes that the
package has been removed and stops the RollerDrive. No error is active.
A further package that is occupying the zone sensor in the upstream zone, is only transported into this zone on expiry
of the 5 seconds, as this zone only transmits a free signal after 5 seconds.
