Specifications

Operations – Functions and Adjustments
12
Removing and Replacing the Plexiglass Cover
To remove the plexiglass cover, loosen the two screws that
hold it in place and gently pry one end of the cover loose with
a small screwdriver. After the rating plug has been installed
and any necessary adjustments have been made, the cover
must be replaced to prevent unauthorized adjustments. (See
pages 10 and 11, steps 2, 3, 5, 6, and 7).
Electronic Trip Unit Functions
Displayed and accessible on the front panel of the trip unit are
adjustments, switches, and indicators that are available to the
user for local control, test, and monitoring.These include:
• System Check Indicator
• Fault Protection Adjustments
• Trip Query Switch and Indicators
• Integral Test Switches and Indicators
• Current Demand Indicators (Display Module Option)
Also accessible on the front panel is a receptacle for an exter-
nal test set and power supply.
The trip unit has factory-installed capability for zone selective
interlocking and communications for remote monitoring.These
functions are accessible via the TS-31 test port.
Setting the Fault Protection Adjustments
The Electronic Trip Unit executes its overcurrent protection
functions based on the rating plug value and the setting of the
current adjustments.Therefore, care should be taken by the
user to make correct selections and settings.
To avoid potential nuisance tripping while changing settings,
Siemens recommends that all adjustments be made with the
SB breaker in the “Open” position.
To set an adjustment, place a slotted screwdriver onto the
point-to-point adjustment switch and rotate the switch to the
desired setting.The following figures and test illustrate and
describe the fault protection adjustments.
All pick-up adjustments, except ground fault, are multiples
of the rating plug value, I
n
. Ground fault pick-up is a multiple
of the MAX rating. All pick-up settings are RMS amperes
or values.
2000A Electronic Trip Unit adjustment panel with plexiglass cover
removed and access adjustment switches shown.
DANGER
Hazardous Voltage.Will cause death or serious injury.
Turn off and lock out all power supplying the device prior to
cover(s) removal or while cover(s) are removed and when
installing any internal or external accessory.
Replace the cover(s) and shield(s) before power supplying
this device is turned on.