Cutler-Hammer Digitrip RMS 510, Instructions Manual

Page: 9 / 180

I.L. 29-8858
Available Set
t
in
g
s
2. 2.5, 3, 4.
5,
6,
M,, M2
In Multiples of
Rating Plug
Amperes Oni
M1
and
M2 Values are Specified
on Rating Plug
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 Settin
g
s
G
n
d
-
Fa u l t
--�--�
�
Setting
A,
8,
C, D,
m
xln
E,
F. H, K
e
Specific Values
Given on Circuit
Breaker Time-Current
Curve
a
n
d
in Table 1
Fig. 4.6 Ground Fault Current Settings
Effective May 1 997
Page 9
TABLE 1 -GROUND FAU LT C U R R E N T SETTINGS
GROUND FAULT CURRENT SETTINGS
(AMPERES)CD
A B c D E F H K
1 00 25 30 35 40 50 60 75 1 00
200 50 60 70 BO 1 00 1 20 1 50 200
§ 250 63 75 BB 1 00 125 1 50 1 BB 250
300
75 90
1 05 120 1 50
1 B O 225 300
Cii
400 100 1 20 140
LU
1 60 200 240 300 400
a:
LU
600 1 5 0 1 BO 2 1 0 240 300 360 450 600
a.
630
1 5B 1 B9
221 252
3 1 5 37B
473
630
�
5-
BOO 200 240 2BO 320 400 4BO 600 800
C!l
1 000 250 300 350 400 500 600 750 1 000
::J
....1
1200 300 360 420 4BO 600 720 900 1 200
a.
C!l
1 250 3 1 2 375 43B 500 625 750 93B 1200
z
�
1 600
400
4BO
560 640 BOO 960 1 200 1 200
a:
2000 500 600 700 BOO 1 000 1 200 1 200 1 200
0
2400 600 720 B40 960 1 200 1 200 1 200 1 200
LU
....1
....1
2500 625 750 B75 1 000 1 200 1 200 1 200 1200
�
3000/3 1 5 0 750 900 1 050 1 200 1 200 1200 1 200 1 200
en
�
3200
BOO 960
1 1 20 1 200 1 200
1 200 1 200
1 200
4000 1 000 1 200 1 200 1 200 1 200 1 200 1 200 1 200
5000 1200 1200 1 200 1 200 1 200 1200 1 200 1 200
CD Tolerances on settings are
±1 0%
of values shown.
cv
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 t ype circuit
breaker.
4.9 Ground Fault Time Delay Setting
As illustrated in Fig. 4.7, there are two different Ground
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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