Hardware Style Owner's manual

2
Chapter
2–1
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 article 70E of the National
Fire Protection Association (NFPA). Article 70E 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
• preventative maintenance
The figure below consists of some components that make up a typical
installation. The following symbols are used:
1
NEMA rated enclosure suitable for your application and
environment that shields your controller from electrical noise
and airborne contaminants.
1
Disconnect, to remove power from the system
2
Fused isolation transformer or a constant voltage transformer, as
your application requires
3
Disconnect
Device
Isolation
Transformer
SLC 500
Controller
MCR
Master control relay/emergency stop circuit
4
Terminal blocks or wiring ducts
5
Suppression devices for limiting EMI (electromagnetic
interference) generation
6
4
6
5
3
2
Typical Installation