ABB S800 I/O User Manual page 60

Brr…hyÃDs‚…€h‡v‚ÃhqÃD†‡hyyh‡v‚ÃV†r…¶†ÃBˆvqr
8uhƒ‡r…Ã! D†‡hyyh‡v‚
Q…‚‡rp‡v‰rÃ@h…‡u
The main power source distribution normally includes a protective ground wire.
This shall be connected to the protected earth (PE) terminal block on a primary
power switch unit. Use cable lug connectors when connecting on the ground screw.
B…‚ˆqÃGvr
The cabinet is to be grounded with a copper lead (≥35 mm, 2 AWG) to the plant
ground line. Cabinets in a row shall be individually connected to the plant ground
plane as required.
B…‚ˆqvtÂsÃQ…‚pr††Ã8hiyrÃTuvryq†
Process cable shields are, as applicable, attached directly to the cabinet ground.
B…‚ˆqvtÂsÃ8‚€€ˆvph‡v‚Ã8hiyrÃTuvryq†
The shields of communication cables are to be connected directly to the modem or
FCI module in an I/O station. This pertains to conventional shielded multi-lead
cable. Please refer to the
PROFIBUS documentation for more information.
B…‚ˆqvtÂsÃQ…‚pr††ÃTvthy†
There are three applications of signal grounding directly to chassis. (High frequency
grounding by capacitors is always provided and not discussed in this context).
•
•
•
50
6q‰h‡ÃAvryqiˆ†Ã ÃV†r…¶ †ÃBˆvqr
Refer to
T'ÃDPÃH‚qˆyr†ÃhqÃUr…€vh‡v‚ÃVv‡†ÃV†r…¶ †ÃBˆvqr
grounding requirements of each I/O module.
Signals can be commonly grounded by earthing the reference 0V of centralized
power supply for loads and sensing. Such a power supply system must be
grounded to the same earth line as the system.
Individual grounding of a signal in the I/O cabinet is possible (if applicable
with respect to I/O module type). The requirement for such an application, is
when the signal is not grounded elsewhere, for example, not locally grounded
at load/sensor or not grounded via a power supply grounding.
and relevant
for the
3BSE 020 923R101