Cutler-Hammer Digitrip RMS 510, Instructions Manual

Page: 109 / 180

I.L. 29-8858
r-, 1"""1
I
1
1
I
1 ""
Setting lnsL
I L
m
x ln
:
®
(S)
I_
-
-
Available Settings
2. 2.5,
3, 4,
5, 6, M , , M,
In Multiples of
Rating
Plug
Amperes !In)
M1 and M2 Values are Specified on Rating Plu
g
Fig. 4.5 Instantaneous 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 Auxiliary 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 believe there is an error in the
trip unit when there is none. The reason this occurs
is that the single phase test current is not a good
simulation of the normal three phase circuit. If three
phase current had been flowing, the trip unit would
actually have performed correctly. Use the APM for
correct trip unit performance whenever single phase
tests are made.
Available Settings
�
Gnd-Fault
Setting
A, B.
C,
D.
m
X
in
E. F. H. K
e
Specific Values
Given on
CirCUit
Breaker Time-Current
Curve
and in Table 1
Fig. 4.6 Ground Fault Current Settings
Effective May 1 997
Page 9
TABLE
1
- GROUND FAU LT CUR RENT SETTINGS
GROUND FAULT CURRENT SETTINGS
(AMPERES)<D
A B c D
E F
H K
1 00 25 30 35 40 50 60 75
1 00
200
50
60
70 80
100 120
1 50 200
@
250 63 75 BB 100
125
150 1 BB 250
300 75 90 1 05 120 1 50 180 225 300
fi)
400
w
1 00 1 20 140 160 200 240 300 400
a:
600 150 1 BO 2 1 0
w
240 300 360
450 600
a_
630 15B 1 B9 221 252
3 1 5
37B
473
630
::E
�
BOO 200 240 2BO 320 400 480 600 BOO
(!)
1 000 250 300 350 400 500 600 750 1 000
::J
..J
1 200 300 360 420 480 600 720
900 1 200
a_
(!)
1250
312
375 43B 500
625
750 938 1200
z
�
1 600 400 4BO 560 640
BOO
960 1 200 1 200
a:
2000 500 600 700 BOO 1000 1 200 1 200 1 200
Cl
2400 600 720 640 960 1 200 1200 1200
1 200
w
..J
1 200
..J
2500 625 750
B75
1 000 1 200 1 200
1200
;:!:
3000/31 50
750
900 1 050 1 200
1 200
1 200 1 200 1 200
Ul
�
3200 BOO 960 1 1 20 1 200
1 200
1 200 1200 1 200
4000 1 000 1200 1 200 1 200 1 200 1 200 1200 1200
5000 1200 1200 1 200 1200 1200 1 200 1 200 1 200
<D Tolerances on settings are ±1
0%
of values shown.
m
Refer
to
Type DS, type SPB or Series C A-Frame supplemental instruction
leaflets given in Section
9
for list of available rating plugs for each type circuit
breaker.
4.9 Ground Fault Time Delay Setting
As illustrated in Fig. 4.7, there are two different G round
Fault curve shapes, i.e. , fixed time (flat) or 12t response.
The shape selected depends on the type of selective
coordination chosen. The 12t 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, .4, .5 sec.) and three 12t (.1 *, .3*, .5*
sec.) response time delay settings are available. The 12t
response settings are identified by the suffix asterisk (*)
that appears in the setting viewing window. The 12t
response is applicable to currents less than 0.625 times
the ampere rating of the installed rating plug
(In).
For cur-
rents greater than 0.625 x
In
the 12t response reverts to
the flat response.
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