Tel.: +45 43 52 55 66 Fax: +45 43 52 81 16 [email protected] www.socosystem.com
8
97
24
74
001
1_2
008
.12
.1
7_S
PR
_G
B
5. Accumulation systems
5.1 Accumulation principles
An SPR is typically used for accumulation conveyors where each roller can accumulate one item. This
can be controlled either by a PLC system or by a SOCO power supply box.
This section describes accumulation by means of a Power Supply Box, subsequently named PSB.
An SPR can accumulate items according to two principles by means of a PSB:
■
Pressure accumulation
■
Zero pressure accumulation
Both principles can be compared with cars arriving at a traffic light with red light. The cars stop one by
one and await green light. When the light turns green, they start one at a time and continue forwards
spaced.
The difference between the two accumulation methods is that the cars will bump into each other in
connection with pressure accumulation whereas the cars will stop spaced in connection with zero
pressure accumulation.
Both principles imply a division of the roller conveyor into equally large zones. A zone consists of an SPR
and a number of non-driven rollers. The non-driven rollers are driven by an SPR by means of a belt drive.
If the zone is to have zero pressure accumulation, it must be equipped with a transmitter (photocell).
5.2 Electric connection
An SPR is connected to a PSB in connection with both accumulation principles. The PSB functions partly
as power supply for up to 7 rollers and partly generates the electric communication from SPR to SPR
and, if required, from PSB to PSB.
5 conductors are led out of an SPR. The 5 conductors are connected in a plug allowing easy installation
and, if required, relocation of an SPR without the use of tools.
The socket is available with wire lenghts in various standard dimensions. The free wire end is mounted
in PSB.
A PSB can be supplied with 110, 230, 400, or 440 V AC, 50 or 60 Hz, and its 24 V DC outlets to the roller
and transmitters are protected against overload and short-circuit.
A light-emitting diode can be seen through the lid of the PSB. If it lights green, everything is OK. If it lights
red, there is a short-circuit on the 24 V DC side. If it changes between green and red light, there is
overload on the 24 V DC side.
