EZAutomation EZ 10 Series, Getting Started Manual, Page: 8 / 69

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Safety Considerations
Please follow all applicable sections of the National Fire Code, National Electrical Code, and the codes of the National
Electrical Manufacturer’s Association (NEMA) to ensure maximum safety of the equipment and personnel.
Plan for Safety
It is an absolute must to follow all applicable sections of:
•
The National Fire Code
•
The National Electrical Code (NEC)
•
The National Electrical Manufacturer’s Association (NEMA) codes.
Local regulatory and government offices usually provide excellent help to determine which codes and standards
are necessary for safe installation and operation. Please note these codes may change from time to time, so it is
the responsibility of the user to keep up to date.
Safety Techniques
Safety is the most important element of a proper system installation. Adhering to these safety considerations ensures
the safety of yourself and others, as well as the condition of your equipment. We recommend reviewing the
following safety considerations:
1)
Disconnecting Main Power
The main power switch should be easily accessible to the operators and maintenance personnel. It is important
to make sure that all other sources of power, including pneumatic and hydraulic, are de-energized before starting
the work on a machine or process controlled by a PLC.
2)
Safety Circuits
Most of the machines are installed with safety circuits, like Limit switches, Emergency stop push buttons, and
Interlocks. These circuits should always be hard-wired directly to the PLC. These devices must be wired in series
so that when any one device opens, the PLC is automatically de-energized. This removes power to the machine.
These circuits should not be altered in any case, since serious injury or machine damage could result.
3)
Fail-Safe Operation
Our products are not fault-tolerant and are not designed or intended for use as on-line control equipment in
hazardous environments requiring fail-safe performance, such as in operation of nuclear facilities, aircraft
navigation or communication systems, air traffic control, direct life -support machines, weapons systems,
clutch control systems on presses, in which the failure of the product could lead directly to death, personal
injury or severe physical or environ- mental damage. External fail safe and/or redundant components are
required to make your control system Fail-safe.