Eaton Cutler-Hammer Digitrip 3000, Инструкции по установке, эксплуатации и техническому обслуживанию

Страница: 32 / 92

I.B. 17555C
Effective November 1999
Page 26
tons can now be used to change the value of the set-
point. Keep in mind that the Raise and Lower pushbut-
tons will roll over from highest to lowest and lowest to
highest respectively. If either of the pushbuttons is held
down and not released, their function is accelerated. This
is true for all white pushbuttons on the panel face.
The curve shape setting is selectable for both the phase
and ground curves. Refer to Section 2-1.4 and Table 2.1
to review the curve shape selection possibilities.
Pressing and releasing the Select Settings pushbutton
will cause the unit to step to the next setpoint. This is the
Phase Inverse Time Overcurrent Pickup setting. The
Inverse Time Overcurrent Pickup LED will blink green.
Simultaneously, the Phase LED will be blinking green,
indicating that this setting is associated with the phase
protection curve.
After the Raise and/or Lower pushbuttons are used to
arrive at the desired Phase Inverse Time Overcurrent
Pickup, the Select Settings pushbutton can be pressed
and released to step to the next setpoint, which is the
Phase Time Multiplier. The Time Multiplier setting LED
will blink green along with the Phase LED. Refer to Table
2.2 for the available settings and note that the available
settings can vary, depending upon which curve shape
was previously selected.
Pressing and releasing the Select Settings pushbutton
will cause the unit to step to the Phase Short Delay
Pickup setting. Refer to Table 2.2 for the available set-
tings. This function can be disabled by selecting the
“NONE” setting. 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 setpoint. The next setpoint is Short
Delay Time setting (Table 2.2), unless “NONE” was
selected for the Short Delay Pickup. If “NONE” was
selected, the Short Delay Time setting will automatically
be bypassed in favor of the next in order setting, Phase
Instantaneous Pickup.
When at the Phase Instantaneous Pickup setting, both
the Instantaneous Pickup LED and the Phase LED will
blink green. Refer to Table 2.2 for the available instanta-
neous settings. Once a selection other than “NONE” is
made and the Select Settings pushbutton is pressed and
released, the unit steps to the next setpoint. If “NONE” is
the setting selected and the Select Settings pushbutton is
pressed and released, the Phase and Instantaneous
LEDs remain on and the unit will now offer a choice of
whether to turn the discriminator option on or off. Refer to
Section 2-1.4 to review the discriminator option details.
Once the discriminator option selection is made and the
Select Settings pushbutton is pressed and released, the
unit steps to the next setpoint.
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 push-
buttons to arrive at the desired Ground Curve Shape Set-
ting.
Programming the ground setpoints is handled in the
same manner as was used in selecting the phase set-
points, except for the following:
1. The Ground Inverse Time Overcurrent Pickup can be
disabled by selecting “NONE.” 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 set-
ting.
For a complete listing of all the available ground set-
points, refer to Table 2.3.
When all of the ground setpoints 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. Refer to Section 2-1.4 and Table 2.3 to review the
High Load function and/or to select the appropriate High
Load time setting. Once this selection is made and the
Select Settings pushbutton is pressed and released, the
unit steps to the next setpoint.
The next setpoint 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. Refer to Table 2.4 to select the desired CT ratio.
Once this selection is made and programmed, the Select
Settings pushbutton is pressed and released to move to
the last setpoint.
The last setpoint selection to be made is the Ground CT
Ratio Setting. Refer to Table 2.4 to select the desired CT
ratio. Once this selection is made and programmed, the
Select Settings pushbutton is pressed and released. The
relay will cycle back to the first setpoint, Curve Shape.
It is possible to step backwards through the setpoints by
pressing and holding down the Select Settings pushbut-
ton, while pressing and releasing the Lower pushbutton.