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Determine the catalog number of the Safety Isolation System based on the rating of the load(s) to which it will be connected as follows:
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— If the Safety Isolation System is connected to a single motor load, the horsepower or kilowatt rating of the system should be determined as follows:
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a. Select the Safety Isolation System that meets or exceeds the horsepower or kilowatt rating of the load at the required voltage and frequency.
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— If the Safety Isolation System is connected to two or more motors or one or more motors in combination with other loads; the horsepower or kilowatt rating of the system should be determined as follows:
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b. Identify the types of loads (i.e. motor, resistive) and the values of the currents of each of the loads (i.e. steady-state current for resistive loads, full-load and locked-rotor currents for motor loads) to be connected to the Safety Isolation System.
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c. Sum the full-load currents of all the motor loads to be connected to the Safety Isolation System. To this value add the current values of all resistive loads to be connected to the Safety Isolation System. This value is the combined load full-load current.
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d. Find the horsepower or kilowatt rating of a single motor with a full-load current value greater than or equal to the combined load full-load current value determined in step b.
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e. Select the Safety Isolation System that meets or exceeds this horsepower or kilowatt rating at the required voltage and frequency.
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f. Sum the locked-rotor currents of all the motor loads to be connected to the Safety Isolation System. To this value add the current values of all resistive loads to be connected to the Safety Isolation System. This value is the combined load locked-rotor current.
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g. Find the horsepower or kilowatt rating of a single motor with a locked-rotor current value greater than or equal to the combined load locked-rotor current value determined in step e.
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h. Select the Safety Isolation System that meets or exceeds this horsepower or kilowatt rating at the required voltage and frequency.
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i. Compare the ratings of the Safety Isolation Systems selected in steps d and g. Select the larger of the two systems for your application.
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| 2.
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Determine how many Remote Lockout Stations are required for the application.
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Determine how many Expansion Modules (if any) are required for the application.
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Pick suitable enclosure type(s) for the Safety Isolation System Power Panel, Remote Lockout Stations and enclosed modules (e.g., Expansion Modules, Pneumatic and Hydraulic Isolation Module).
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Determine what, if any, factory-installed options are required for the application (e.g. Pneumatic Isolation, Hydraulic Isolation, Status Communication to remote PLC, metering).
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