Schmalz SMPi 20, Operating Instruction, Page: 7 / 50

S
CHMALZ
SCP
I
/ SMP
I
2-7
Electrical connection

The electrical connection of the ejector is made using 8-pin M12 male connector. The pin
assignment is described in the “Technical data” chapter.

The plug connectors may not be connected or disconnected when the system is live.

The ejector may only be operated via power supply units with protected extra-low volt-
age (PELV). The system must incorporate safe electrical cut-off of the power supply in
compliance with EN60204.

The power supply, signal inputs and signal outputs have a maximum line length of 30
metres.
Pneumatic connection

Use only well maintained compressed air (air or neutral gas according to EN 983, filtered
40 µm, oiled or unoiled).

High quality compressed air is important for the prolonged service life of the ejector.

Dirt particles or foreign bodies in the ejector connections, hoses or pipelines can lead to
partial or complete ejector malfunction.

Hoses and pipelines should be laid as short as possible.

Insufficient compressed air is supplied if the internal diameter on the compressed air
side is too small. This prevents the ejector from performing as specified in its defined
performance data.

Excessive flow resistance occurs if the internal diameter on the vacuum side is too small.
This leads to both a reduction in suction power and increased suction times. Blow-off
times are also lengthened.

Hose lines must be laid without bends and crimps.

Only use the hose or pipe internal diameters recommended for the ejector. If this is not
possible, use the next largest internal diameter.
Line cross-section internal diameter
1)
Compressed air side Vacuum side
8 mm 9 mm
1)
Based on a maximum hose length of 2 m