Chapter 3
Publication
1747-6.2
System Installation
Recommendations
To help you install the SLC 500 programmable controller as safely
and securely as possible, we have set up a few specific
recommendations for you to follow. For general installation
guidelines, also refer to the requirements specific to your region.
• Europe: Reference the standards found in EN 60204 and your
national regulations.
• United States: Refer to article 70E of the National Fire
Protection Association (NFPA). It describes electrical safety
requirements for employee workplaces.
This chapter covers the following:
• typical installation
• spacing your controllers
• preventing excessive heat
• grounding guidelines
• master control relay
• power considerations
• safety considerations
• preventive maintenance
The figure below consists of some components that make up a
typical installation. The following symbols are used:
➄
➅
➃
➀ NEMA rated enclosure suitable for your
application and environment that shields
your controller from electrical noise and
airborne contaminants.
➁ Disconnect, to remove power from the system
➂ Fused isolation transformer or a constant
voltage transformer, as your application
requires
➁ Disconnect
Device
➂ Isolation
Transformer
SLC 500
Controller
MCR
➃ Master control relay/emergency-stop circuit
➄ Terminal blocks or wiring ducts
➅ Suppression devices for limiting EMI
(electromagnetic interference) generation
➀
T
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