Omron NYB1E-C1006 [145/276] 4 2 ground

5-4-2

Ground

This section describes how to ground the Industrial Box PC.

WARNING

Always connect to a ground of 100 Ω or less when installing the product.

CAUTION

The product has an internal non-isolated DC power supply. Circuit ground (0 VDC)

and frame ground are connected together

. When connecting a non-isolated device or

a non-isolated interface to the product, take appropriate actions to avoid communica-

tion failures or damage to the mentioned ports.

Industrial PC Platform Product

Non-isolated

Device

Non-isolated

Interface

24 VDC

0 VDC

CAUTION

Never ground the 24 VDC side of the power supply. This may cause a short circuit.

The shielding of the communication connectors are directly bonded to the case and to the functional

ground of the Box PC.

The shield of a communication cable should be terminated to ground at both ends of the cable with a

low impedance connection. A large surface area surrounding the entire cable shield ensures a low im-

pedance connection, avoid the use of pigtails.

Potential differences between the two connected communicating devices might cause an equipotential

current to flow through the shielding connected at both ends.

o avoid equipotential currents on the cable shields, an additional equipotential bonding conductor

must be installed.

Refer to IEC 61918 for guidelines regarding conductor sizing and length to prevent a voltage offset

between two communicating devices exceeding 1 V.

Make sure to run the bonding conductor in close proximity to the communication cable.

5 Installation

5-29

NY-series Industrial Box PC Hardware User's Manual (W553)

5-4 Wire

5-4-2 Ground