Ground Fault Current Settings; Ground Fault Time Delay Settings - Eaton Cutler-Hammer Digitrip RMS 510 Trip Unit Instructions Manual

I.L. 29-8858
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Setting
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M1 and M2 Values are Specified on Rating Plug
4.5
Fig. Ins tantaneous Current Settings
Note: For Testing Purposes Only: When using an
external single phase current source to test low level
ground fault current settings, it is advisable to use
the Auxil iary Power Module (APM) (See Fig. 7). Espe­
cially when the single phase current is low, without
the APM it may appear as if the trip unit does not
respond until the current is well above the set value,
leading the tester to bel ieve there is an error in the
trip un it when there is none. The reason this occurs
is that the single phase test cu rrent is not a good
simulation of the normal three phase circuit. If three
phase current had been flowing, the trip u n it would
actually have performed correctly. Use the APM for
correct trip unit performance whenever single phase
tests are made.
Gnd-Fault
�
Setting
[J
xl n
e
4.6
Fig.

Ground Fault Current Settings

Effective May 1997
------
Available Setti ngs
I 3. 4,
2. 2.5,
5. 6, M,, M,
of
In Multiples
Rating Plug
Amperes O n )
Available Setti n gs
A. 8, C, D,
E. H, K
F.
Specific Values
on cuit
Given Cir
Breaker Time-Current
Curve and in Table
TABL E 1 -GROUND FAULT CURRENT SETIINGS
GROUND FAULT CURRENT SETTINGS
A
25
100
200 50
250 63
300 75
400 100
w
a:
600
150
630 158
800 200
(9
1000 250
_J
1200 300
(9
1250 312
1600 400
a:
2000 500
2400 600
w
_J
_J
2500 625
3000/3150 750
3200 800
4000
1000
5000 1200
CD
Tolerances on settings are
•2!
Refer to Type DS, type SPB or Series C R-Frame supplemental instruction
leaflets given in Section
breaker.
4.9 Ground Fault Time Delay Setting
As illustrated in Fig.
Fault curve shapes, i.e. , fixed time (flat) or 1 2 t response.
The shape selected depends on the type of selective
coordination chosen. The 1 2 t response will provide a
longer time delay in the low-end of the ground fault cur­
rent range than will the flat response.
Five flat (.1, .2, .3,
1
sec.) response time delay settings are available. The 1 2 t
response settings are identified by the suffix asterisk (*)
that appears in the setting viewing window. The 1 2 t
response is applicable to currents less than 0.625 times
the ampere rating of the installed rating plug
rents greater than 0.625 x
the flat response.
(AMPERES)
•
D
B c E F
30 40 50
35 60
60 70 80 100 120
75 88 100 125 150
90 105 120 150 180
1 40 160 200 240
120
210 240 300 360
180
252 315 378
189 221
320 400 480
240 280
400 500
300 350 600
480 600
360 420 720
500 625
375 438 750
480 560 640 800 960
600 700 800 1000 1200
720 840 960 1200 1200
750 875 1000 1200 1200
900 1050 1200 1200 1200
1120 1200 1200 1200
960
1200 1200 1200 1200
1200
1200 1200 1200
1200 1200
±1 0%
of values shown.
9
for list of available rating plugs lor each type circuit
4.7, there are two different Ground
.5 sec.) and three 1 2 t (.1*, .3*, .5*
.4,
the 1 2 t response reverts to
In
Page 9
H K
75 100
150 200
188 250
225 300
300
400
600
450
473 630
800
600
750 1000
900 1200
1200
936
1200 1200
1200 1200
1200 1200
1200 1200
1200 1200
1200 1200
1200 1200
1200 1200
(In).
For cur-