SEW-Eurodrive ECDriveS ECC-DFC, Руководство пользователя, Страница: 41 / 96

Auto configuration of the linear conveyor
Manual
– ECC-DFC field bus controller 41
7.7. Jam statuses
The ECC-DFC detects two types of jam status:

Sensor jam

“No Arrival Jam”
7.7.1. Sensor jam
If a load is still blocking the photo sensor in an upstream zone after an attempt
has been made to transport the load to the next downstream zone, the controller
detects a sensor jam. This is indicated as shown in the table in the section enti-
tled “Sensors”. If the load has been removed from the vicinity of the photo sensor,
the sensor jam is automatically canceled if the standard 5 seconds of the reset
timer have elapsed.
After a sensor jam has occurred or if the sensor remains blocked, the controller
will attempt to remedy the situation. First the controller will allow the motor of the
affected zone to run slowly backwards for 1 second in order to clear the blocked
sensor. If the sensor is still blocked after this first attempt, the controller will re-
peat this movement twice. If the sensor is clear after one of these three attempts,
the zone returns to normal function, and the controller will attempt to continue
transporting the load under normal ZPA control.
If the sensor is still blocked after three attempts of this motor reversal cycle, the
zone remains in sensor jam status, and the load must be removed manually in
order to restart the zone.
7.7.2.
“No Arrival Jam”
If a load leaves an upstream zone and is transported to the next downstream
zone, the upstream zone expects a confirmation of receipt from the downstream
zone. This communication takes place automatically within the network of the
fieldbus controller.
If a new load arrives in the upstream zone while this is still waiting for a confirma-
tion of receipt from the downstream zone, the new load will jam in this upstream
zone. If the upstream zone does not receive the confirmation within the jam timer
time interval, the controller will generate a “No Arrival Jam” error message.
As soon as a “No Arrival Jam” occurs, the controller automatically stops all new
loads in the upstream zone for a preset time and then continues with the normal
ZPA function. By default, the time settings of the jam timer and the reset time are
the same, i.e., the maximum time for which a new load would jam in the upstream
zone would be 5 s + 5 s = 10 s.
INFORMATION
The 5 second jam timer time is a preset value. Instructions for modifying this val-
ue can be found in the help function of the ECShell engineering software.