2
0
1
8
-0
6
12
Product Description
2.2.2
Standard ZPA
Conveyed product must have completely left the zone before the next conveyed product may
enter. As soon as the outgoing conveyed product is no longer detected by the zone sensor, the
release signal is set. This operating mode thereby realizes zero pressure accumulation with
single accumulation and single release. It ensures a strict separation of the conveyed product
while maintaining the maximum safety distance.
The following example describes the sequence in the operating mode "Standard ZPA":
Figure 2.7
■
Step A: Zone (2) has accumulated its conveyed product because downstream zone (3)
has not set its release signal (red light). Because zone (2) is occupied, it also does not
issue a release to upstream zone (1).
■
Step B: Downstream zone (6) has set the release signal (green light) and the conveyed
product is conveyed to the next zone (6). Because the conveyed product has not yet left
the zone sensor (5), zone (5) does not issue a release to upstream zone (4).
■
Step C: The conveyed product has left the zone sensor. Therefore, zone (8) sets the
release signal for upstream zone (7) to allow the next conveyed product to be transported.
Downstream zone (9) has now completely accepted the conveyed product and prohibits
further product from entering by withdrawing the release.
The following time conditions are used in the operating mode "Standard ZPA" (see Chapter
"Operating Behavior"):
■
Leaving time
■
Entry time
■
Transportation time
■
Motor run-on time
■
Switch-on delay
■
Search time
Please note that this operating mode distinguishes between 1-zone operation and 2-zone
operation and separate settings exist for both operating modes.
5
6
4
B
2
3
1
A
8
9
7
C
Roller motor
Zone sensor
Zone sensor
Roller motor
Zone sensor
Zone sensor
Roller motor
Zone sensor
Zone sensor
