Pilz PMI o315 ATEX, Operating Manual, Page: 62 / 183

Installation and Wiring
5 - 6 Operating Manual: PMI v315 ATEX/PMI o315 ATEX
Polarity protection
CAUTION!
The PMI has polarity protection. To ensure that the polarity protection is
working, follow the instructions below when commissioning the PMI:
• Remove all connections to external devices.
• Connect the PMI to the supply voltage.
• Switch on the supply voltage.
• If the PMI fails to start, the connections probably have reverse polarity.
In this case, swap the connections.
• Connect the PC or other periphery devices after the PMI has been
started.
Cable layout
• Electrical or electronic components which could cause interference
(contactors, thyristors, relay coils and solenoid valve coils) should be
physically separate from data lines.
We recommend you use a sheet metal (MU metal) bulkhead between
both areas.
• Data lines and power lines should be laid separately to avoid capacitive
and inductive transmission (recommended minimum distance = 10 cm/
3.94").
• Screened data lines should also be laid in a different cable duct to the
main power lines.
• Power lines should be as short as possible
• Power lines should be twisted pair cables.