DT3000
Instruction Leaflet
I.B. 17555D
Effective: Date 07/02
Page 27
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www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
and released to step to the next set point, which is the
Phase Time Multiplier. The Time Multiplier setting LED will
blink green along with the Phase LED.
Pressing and releasing the Select Settings pushbutton will
cause the unit to step to the Phase Short Delay Pickup
setting. Selecting the “NONE” setting can disable this
function. The Short Delay Pickup LED and the Phase LED
will blink green. After the Raise and/or Lower pushbuttons
are used to arrive at the desired setting, the Select
Settings pushbutton is pressed and released to move to
the next set point.
The next set point is Short Delay Time setting, unless
“NONE” was selected for the Short Delay Pickup. If
“NONE” was selected, the Short Delay Time setting will
automatically be bypassed to the next setting, Phase
Instantaneous Pickup.
When at the Phase Instantaneous Pickup setting, both the
Instantaneous Pickup LED and the Phase LED will blink
green. Once a selection other than “NONE” is made and
the Select Settings pushbutton is pressed and released,
the unit steps to the next set point. If “NONE” is the setting
selected and the Select Settings pushbutton is pressed
and released, the Phase and Instantaneous LED’s remain
on and the unit will now offer a choice of whether to turn
the discriminator option on or off. Once the discriminator
option selection is made and the Select Settings
pushbutton is pressed and released, the unit steps to the
next set point.
Ground Inverse Time Overcurrent setting is the next set
point. The Ground Curve Shape LED and the Ground LED
will blink green. Use the Raise and/or Lower pushbuttons
to arrive at the desired Ground Curve Shape Setting.
Programming the ground set points is handled in the same
manner as was used in selecting the phase set points,
except for the following:
1. Selecting “NONE” can disable the Ground Inverse
Time Overcurrent Pickup. This is not possible on the
Phase Inverse Time Overcurrent Pickup.
2. If “NONE” is selected for the Ground Instantaneous
Pickup setting, there is no discriminator option, as was
the case for Phase Instantaneous Pickup setting.
When all of the ground set points are established and the
Select Settings pushbutton is pressed and released, the
unit steps to the High Load Setting. The High Load LED
will blink green and the last programmed value for the High
Load time setting will appear in the alphanumeric display.
Once this selection is made and the Select Settings
pushbutton is pressed and released, the unit steps to the
next set point.
The next set point selection to be made is the Frequency.
The choices are 60Hz and 50Hz. When this selection is
made and the Select Settings pushbutton is pressed and
released, the relay steps to the Phase Ct Ratio Setting.
The Phase LED will blink green and the programmed value
for the phase Ct will appear in the alphanumeric display.
Once this selection is made and programmed, the Select
Settings pushbutton is pressed and released to move to
the last set point.
The last set point selection to be made is the Ground Ct
Ratio Setting. Once this selection is made and
programmed, the Select Settings pushbutton is pressed
and released. The relay will cycle back to the first set point,
Curve Shape.
It is possible to step backwards through the set points by
pressing and holding down the Select Settings pushbutton,
while pressing and releasing the Lower pushbutton.
To save the new settings at any time, press and release
the Save Settings pushbutton. When the Save Settings
pushbutton is pressed and released, the unit will blank the
alphanumeric display for two seconds, and then display the
last setting. At this moment, the unit will use the new set
points for protection. After pressing the Save Settings
pushbutton, the Program Mode can be exited by any one
of three ways:
1. Press and release the Program Mode On/Off
pushbutton.
2. Press and release the Reset pushbutton.
3. Perform no programming activity for 2 1/2 minutes.
THE SAVE SETTINGS PUSHBUTTON MUST BE
PRESSED AND RELEASED BEFORE EXITING THE
PROGRAM MODE. OTHERWISE, THE CHANGED
SETPOINTS WILL NOT BE SAVED. IN ADDITION,
AFTER THE PROGRAMMING OF SETTINGS IS
COMPLETE, IT IS VERY IMPORTANT TO VERIFY
ALL THE SETTINGS BY DEPRESSING THE “VIEW
SETTINGS” PUSHBUTTON AND STEPPING
THROUGH THE SETTINGS.
3-3.3 PROGRAMMING OVERVIEW
An overview of the programming function is presented here
in terms of two flow charts. These flow charts are intended
as quick references after the material presented in Section
3-3.2 has been reviewed.
The flow chart entitled “Programming Sequence Preview”
(Figure 3-10) presents the general programming steps the
Digitrip 3000 follows, always beginning with the Curve
Shape” selection. Each time the “Select Settings”
pushbutton is pressed and released, the relay advances to
the next sequential step.
