Spectrum-controls 1746sc-CTR4 Uživatelský manuál stáhnout pdf (Strana 13)

Chapter 2: Installing And Wiring Your Module 13

Determining Power

Requirements

The backplane of the system can provide both 5 Vdc and 24 Vdc power.

The following table shows the maximum current consumed by your module

when using these power sources:

Table 2.1. Backplane current consumed

Catalog Number 5 Vdc 24 Vdc

1756sc-CTR8 230 mA 75 mA

Use Table 2.1 to calculate the total load on the system power supply. For

more information, see the Allen-Bradley system Installation and

Operation Manual.

Selecting a Rack Slot

Two factors determine where you should install your module in the rack:

ambient temperature and electrical noise. When selecting a slot for your

module, try to position your module:

• in a rack close to the bottom of the enclosure (where the air is cooler)

• away from modules that generate significant heat, such as 32-point

input/output modules

• in a slot away from ac or high-voltage dc modules, hard contact

switches, relays, and ac motor drives

• away from the rack power supply (if using a modular system)

Remember that in a modular system, the processor always occupies the

first slot of the rack.

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Spectrum-controls 1746sc-CTR4 Uživatelský manuál Strana 13