Motorola CPCI-6115 Manuel de service télécharger pdf (Page 49)

Chapter 4 Site Preparation

CPX8216 and CPX8216T Installation and Use (6806800A52C)

Guidelines for Branch Circuits

All branch circuits for the chassis must come from the same circuit breaker panel. Failure to do

this can cause power to flow in the data cables interconnecting the various devices of the

chassis.

Do not overload branch circuits. Check the manual and/or rating plate of all devices and verify

that the sum of the ampere ratings do not exceed two-thirds of the branch rating.

Laser printers and some other devices cause periodic short-duration, heavy loads that do not

appear in their ampere ratings. Connect these devices on a separate branch circuit from the

chassis.

Using power strips with separate circuit breakers does not add additional protection and may

cause unwanted power interruption. Ensure that all power strips use at least #14 AWG with

ground.

Note Do not use surge/transient suppressors without careful and expert power system

analysis. Most surge/transient suppressors can cause chassis damage from transients if used

in the typical manner.

All branch circuits must have a “third wire” type ground for the branch circuit that only goes to

the circuit breaker panel. Conduit ground is unacceptable for any portion of the system.

Blinking lights or fluctuating intensity from lighting at the computer site indicate poor power. This

may be a cause of system hang-ups. Check the electrical installation to ensure proper

operation.

Note Failure to observe proper grounding practices may cause a variety of noise, electrostatic

discharge, and radio frequency interference problems.

Power Circuit Protection

Protect the power circuit with an electrical line filter that prevents voltage spikes from reaching

the system.

Circuit Breakers and Receptacles

Make sure circuit breakers furnishing power to the system are the correct size to protect the

system. Make sure all receptacles are wired for three-wire power distribution (line, neutral, and

ground).

All power receptacles servicing any equipment that is directly cable-connected to the system

must have a single, common grounding point. The ground wire must be at true ground potential

with a resistance (measured at the power panel bus) of five ohms or less between the bus bar

and earth. The ground wire is the “third wire” type, (not conduit ground).

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Motorola CPCI-6115 Manuel de service Page 49