Instruction Leaflet
DT3000
Page 26
Effective: Date 07/02
I.B. 17555D
For more information visit:
www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
Fig. 3-8 Typical Curve with I
2
T Shape
Fig. 3-9 Instantaneous Setting Adjustment
3-3.2 PROGRAM MODE
DIGITRIP 3000 PROTECTIVE RELAY SETTINGS
MUST BE PROGRAMMED BEFORE THE RELAY IS
PUT INTO OPERATION. CARE MUST BE TAKEN
WHEN PROGRAMMING THE DIGITRIP 3000
WHILE THE BREAKER IS CLOSED AND
CURRENT IS FLOWING. AN INCORRECT
SETTING CONFIGURATION COULD CAUSE THE
RELAY TO TRIP THE BREAKER WHEN SETTINGS
ARE SAVED.
Notes:
1. The Program Mode can be entered with the circuit
breaker open or closed, depending on how DIP switch
S2 is set. Refer to Table 5.1 for DIP switch settings.
The circuit breaker position is determined via the
normally closed breaker “b” contact on terminals 9 and
10 of TB1. Refer to the typical wiring diagram in
Figure 3-1.
2.
The settings that are altered during a programming
session will not be saved until the Save Settings
pushbutton is pressed and released.
3.
If the circuit breaker is closed during a programming
session and DIP Switch S2 is set to “off,” the unit will
exit the Program Mode without saving any new set
point values and an “ERR” message will appear in the
Settings/ Test Time/Trip Cause window.
4.
When programming is concluded and new set points
saved, the Program Mode pushbutton should be
pressed and released to exit the Program Mode.
5.
The Program Mode is also exited if the Reset
pushbutton is pressed and released or if there is no
programming activity for approximately 2-1/2 minutes.
To enter the Program Mode, open the protective access
cover and press and release the Program Mode On/Off
pushbutton. The Program LED will blink green, indicating
that the Program Mode has been entered. The present
value of the first set point to be programmed (Curve
Shape) will appear in the Settings/Test Time/Trip Cause
Window, which will be referred to as the Alpha-numeric
Display for the rest of this discussion. The Curve Shape
LED will be blinking green. The Raise or Lower
pushbuttons can now be used to change the value of the
set point. Keep in mind that the Raise and Lower
pushbuttons 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.
Pressing and releasing the Select Settings pushbutton will
cause the unit to step to the next set point. 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
Instantaneous pickup
is represented by the
dotted portion of the
curve.
