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What is the function of the Test/Normal switch on some of the enclosed drive packages?

Published date: 02 April 2019

Issue:
What is the function of the Test/Normal switch on some of the enclosed drive packages?

Product Line:
Enclosed E-flex, S-flex, MCC buckets and Custom enclosed drives (ISC build)

Environment:
Units equipped with a line side isolation contactor AND full voltage bypass options.

Cause:
Customer needs clarification of this drive feature.

Resolution:
The Test/Normal switch is used to place the drive in test mode so that it can be tested for proper operation.  In Test mode, the drive functions normally and should respond to all commands, but it does not pull in the output contactor that connects the motor to the drive.  This allows you to test the function of the drive without powering the motor. 

Also, certain enclosed drives equipped with line side isolation contactors will not have power to the drive until a run command is issued.  You can put the Test/Normal switch into the test position to power the drive without a run command, in order to make programming changes if needed.

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