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5.3 Pressure or zero pressure accumulation
Pressure accumulation can be used when the following requirements can be met:
■
The lengths of the items are always identical.
■
The weights of the items exceed 5 kg.
■
The items can withstand collision with other items.
■
The items are led to a fixed end stop.
Zero pressure accumulation must be used if:
■
The lenghts of the items vary.
■
The weights of the items are below 5 kg.
■
The items cannot withstand collision with other items.
■
There is no fixed end stop to lead items to.
The weight limit of 5 kg is an approximate limit. The essential factor is that the friction between item and
roller has the effect that the roller power consumption exceeds nominal current when the item is blocked.
This means that factors such as base dimensions, number of non-driven rollers, and the rolling friction
(paper quality) of the transported item are also important.
5.4 Design of an accumulation section
The design of an accumulation section starts at the outlet end of the section.
Components
The first SPR (SPR1) is placed here. A transmitter (S1) is also placed here when using the zero pressure
principle. A PSB (PSB1) for the first 7 rollers is also placed here. It partly functions as power supply and
partly transfers signals from one SPR to the next.
Wiring
SPR1 and S1 are connected to PSB1, terminal strip KL1.
SPR2 and S2 are connected to PSB1, terminal strip KL2.
This continues to SPR7 and S7 which are connected to PSB1, terminal strip KL7.
The subsequent numbering is as follows:
SPR8 and S8 are connected to PSB2, terminal strip KL1.
SPR9 and S9 are connected to PSB2, terminal strip KL2.
This also applies further backwards in the system.
