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Operations- Functions and Adjustments
Part Three - Monitoring the Electronic Trip Unit
General Instructions
The trip unit executes its overcurrent protection functions
based on the rating plug value and the settings of the current
adjustments. Therefore, care should be taken by the user to
make proper selections and settings.
An adjustment will automatically revert to its minimum pos-
sible setting whenever a change to the adjustment is being
made. This may cause inadvertent tripping of the breaker if
the adjustment is made with the breaker in the closed
position. Therefore, Siemens recommends that all adjust-
ment changes be made with the breaker open.
To set an adjustment, place a slotted screwdriver onto the
point-to-point adjustment switch and rotate the switch to the
desired setting.
The figure on the following page describes the region of the
time current curve that is being effected by each adjustment.
For complete information on setting the individual adjust-
ments see the Information and Instruction Guide for the
Electronic Trip Unit, Bulletin 2.20-3A. For time current trip
curves contact your local Siemens sales office.
2000A Electronic Trip Unit (Photo for illustrative purposes)
28
Courtesy of NationalSwitchgear.com
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