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I.B. 17555C
Effective November 1999
Page 10
High Load: The available high load time-out settings are
shown in Table 2.4. At a current 85% or above the inverse
time overcurrent phase setting value, the high load func-
tion will begin timing to the time setting selected and the
High Load LED will blink. If the current drops below the
85% value, the high load timer will reset, and only start
again when the 85% value is again reached. When the
High Load Timer times out three coinciding events can
occur: 1.) The “High Load” LED on the front of the relay
lights continuously, 2.) An alarm signal is sent over the
communications network, and 3.) If Dip Switch #5 is in
the “On” position, the high load alarm also closes the
Communications Close Relay N.O. contacts at terminals
TB2-4 and 5. These events are reset when the current
drops below the 85% level.
System Frequency Selection: Either 60Hz or 50Hz may
be selected (Table 2.4).
Phase and Ground CT Ratio Selection: The available
CT ratio’s, shown in Table 2.4, range from 5:5 to 5000:5.
Defaults: In the unlikely event of missing or invalid set-
tings, the Operational LED will blink Red instead of Green
and the relay will display “PRGM” in the Settings Display
window. This means that the program of settings should
be re-entered and saved.
2-1.5 INTEGRAL TESTING
Digitrip 3000 Protective Relays have a front accessible,
integral field testing capability. This feature introduces a
selected level of internal test current to simulate an over-
load or short circuit. It checks proper functioning of the
relay and verifies that curve settings have been set-up
correctly. The integral test function provides selectable
‘Trip” and “No Trip” test settings for both phase and
ground testing. Refer to Table 2.4 for available test set-
tings. The “P” used in Table 2.4 refers to a phase current
test setting, while the “G” refers to a ground current test
setting. ‘T’ in the table means that the test will initiate a
breaker trip. All settings are in per unit current values
times the In value, which is the selected CT rating.
CAUTION
THE TEST MODE SHOULD NOT BE USED TO TRIP
LIVE CURRENT CARRYING CIRCUITS. IF A LIVE
CURRENT OF GREATER THAN 0.1 TIMES THE
VALUE IS FLOWING IN EITHER A PHASE OR
GROUND CIRCUIT, THE TEST MODE IS AUTOMATI-
CALLY EXITED, ACCOMPANIED BY AN ERROR
MESSAGE IN THE SETTINGS/TEST TIME/TRIP
CAUSE WINDOW.
TABLE 2.5 FACTORY SET DEFAULTS
DIP SWITCH SETTINGS
Type
Default Setting
S1:
ON
(Digitrip 3000 IMPACC Buffers)
S2:
OFF (Program with Breaker Open
Only)
S3:
OFF (Standard Relay Configuration -
OC/Instantaneous)
S4:
OFF (Enable Remote Open/Close)
S5:
OFF (Communications Close))
S6:
OFF (Reserved)
S7:
OFF (Reserved)
S8:
OFF (Disable Download Setpoints)
S9:
OFF (Manual Reset)
S10:
OFF (Reserved)
PHASE SETTINGS
Type
Default Setting
Curve Shape:
LDPU:
LDT:
SDPU:
SDT:
INST:
It
1.0
5 sec.
1.5
1.0 sec.
1.75
GROUND SETTINGS
Type
Default Setting
Curve Shape:
LDPU:
LDT:
SDPU:
SDT:
INST:
It
0.5
5 sec.
0.75
1.0 sec.
1.0
MISCELLANEOUS SETTINGS
Type
Default Setting
DISC:
OFF
HILD:
10 sec.
FREQ:
60 Hz
CT P:
500
CT G:
500
Summary of Contents for Cutler-Hammer Digitrip 3000
Page 18: ...I B 17555C Effective November 1999 Page 12 Fig 2 1 Typical Communications Wiring Diagram...
Page 27: ...I B 17555C Effective November 1999 Page 21 Fig 3 1 Digitrip 3000 Typical Wiring Diagram...
Page 36: ...I B 17555C Effective November 1999 Page 30 Fig 3 11 Local Programming Sequence Flow Chart...
Page 37: ...I B 17555C Effective November 1999 Page 31...
Page 52: ...I B 17555C Effective November 1999 Page 46 Fig 7 5 Short Delay Phase Curves SC 5394 92B...
Page 54: ...I B 17555C Effective November 1999 Page 48 Fig 7 7 Instantaneous Curves SC 5396 92B...
Page 59: ...I B 17555C Effective November 1999 Page 53 Fig 7 12 Short Delay Ground Curves SC 5403 92B...
Page 60: ...I B 17555C Effective November 1999 Page 54 Fig 7 13 ANSI Moderately Inverse Curves SC 6685 96...
Page 61: ...I B 17555C Effective November 1999 Page 55 Fig 7 14 ANSI Very Inverse Curves SC 6686 96...
Page 62: ...I B 17555C Effective November 1999 Page 56 Fig 7 15 ANSI Extremely Inverse Curves SC 6687 96...
Page 63: ...I B 17555C Effective November 1999 Page 57 Fig 7 16 IEC A Moderately Inverse Curves SC 6688 96...
Page 64: ...I B 17555C Effective November 1999 Page 58 Fig 7 17 IEC B Very Inverse Curves SC 6689 96...
Page 65: ...I B 17555C Effective November 1999 Page 59 Fig 7 18 IEC C Extremely Inverse Curves SC 6690 96...
Page 66: ...I B 17555C Effective November 1999 Page 60 Fig 7 19 IEC D Flat Curves SC 6691 96...
Page 68: ...I B 17555C Effective November 1999 Page 62...
Page 73: ...I B 17555C Effective November 1999 Page A5 Fig A 7 DT3001 Typical Wiring Diagram...
Page 76: ...I B 17555C Effective November 1999 Page A8...
Page 81: ...I B 17555C Effective November 1999 Page B5 Fig B 2 Digitrip 3010 3020 Dimensions Inches...
Page 83: ...I B 17555C Effective November 1999 Page B7 Fig B 3 Digitrip 3010 3020 Typical Wiring Diagram...
Page 89: ...I B 17555C Effective November 1999 Page B13...
Page 90: ...I B 17555C Effective November 1999 Page B14...