Long Delay Time Setting; Short Delay Current Setting; Short Delay Time Setting; Instantaneous Current Setting - Eaton Digitrip RMS 610 Instruction Leaflet

Instruction Leaflet I. L. 29-886B
Effective August 2011

3.3 Long Delay Time Setting

There are eight (8) available Long Delay Time Settings, as illustrated
in Figure 13, ranging from 2 to 24 seconds . These settings are the
total clearing times in seconds, when the current value equals six
(6) times I . The (LS) Time-Current Curve applicable for your circuit
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breaker gives complete details (see Section 5) .
N otee: In addition to the standard Long Delay Protection Element, the Digitrip
RMS 610 Trip Unit also has a Long Time Memory (LTM)function, which serves
to protect load circuits from the effects of repeated overload conditions . If
a breaker is re-closed soon after a Long Delay Trip, and the current again
exceeds the Long Delay Current Setting,
the time to trip, to allow for the fact that the load circuit temperature is
already higher than normal, due to the prior overload condition . Repeated
overload can cause LTM to trip the breaker after a time delay less than the
"Long Delay Time Setting" . When the load current returns to normal, the
LTM begins to reset; and after about 10 minutes it has reset fully, so that
next Long Delay trip time will again be the "Setting" value . To reset the LTM
quickly, see Section 4 .4, Item 3 .
.
Long Delay
,
Time
Sec.
4
I
at 6 x
r
I...
Figure 13. Long Delay Time Settings.

3.4 Short Delay Current Setting

There are eight (8) available Short Delay "Pick-up" Current Settings,
as illustrated in Figure 14 . Six settings are in the range from 2
to 6 times I and the other two settings are "S1" or "S2" times I
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(REMEMBER: I is the Long Delay Current Setting) . The values that
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"S1" and "S2" have depend upon the type of circuit breaker, and are
specified both on the rating plug label (see Figure 9) and on the
applicable (LS) Time-Current Curve referenced in Section 5 .
. . .
. .
Setting
I
r
S1 and S2 Values are Specified on Rating Plug
Figure 14. Short Delay Current Settings.
16
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I
, the LTM automatically reduces
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,
Available Settings
2, 4, 7, 10,
12, 15, 20, 24
Seconds at 6 Times
Long Delay Setting
.
. . .
.
(I )
,
r
I
6 x
r
Available Settings
2, 2.5, 3, 4
5, 6, S , S
1
2
In Multiples of
Long Delay Setting
(I )
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Instructions for Digitrip RMS 610 Trip Unit

3.5 Short Delay Time Setting

As illustrated in Figure 15, there are two different Short Delay curve
shapes, i .e ., fixed time (flat) and I
depends on the type of selective coordination chosen . The I
response will provide a longer time delay in the low-end of the short
delay current range than will the flat response .
Five flat ( .1, .2, .3, .4, .5 sec .) and three I
response time delay settings are available . The I
are identified by the suffix asterisk (*) that appears in the setting
viewing window . The I
eight (8) times I the Long Delay Setting . For currents greater than 8
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times I the I t response reverts to the flat response .
2
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N otee: See also Section 1 .1 .5, Zone Interlocking .
:
:
.......
"*" In Viewing Window
Indicates
2
I t
Shape
Figure 15. Short Delay Time Settings.
r

3.6 Instantaneous Current Setting

There are eight (8) available lnstantaneous Current Settings, as illus-
trated in Figure 16 . Six settings are in the range from 2 to 6 times
the rating plug value (I
"M2" times (I ) . The values that "M1" and "M2" have depend upon
n
the type of circuit breaker, and are specified both on the rating plug
label (see Figure 9), and on the applicable (I) Time-Current Curve ref-
erenced in Section 5 .
Setting Inst.
I
6 X
n
M1 and M 2 Values are Specified o n Rating Plug
Figure 16. Instantaneous Current Settings.
t response . The shape selected
2
t ( .1*, .3*, .5* sec .)
2
2
t response is applicable to currents less than
2
,
Short Delay
Time
Available Settings
.1, .2, .3, .4, .5,
Seconds with
Flat Response
.
.
.
2
I t Shape
Returns
t o
Response at Currents
Higher than
. .
. .1*, .3*, .5*
,
Seconds with
.-----
2
I t Shape
I
8 x I
r
), and the other two settings are "M1" and
n
:-----
t
2
t response settings
Flat
8 x I
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Available Settings
2, 2.5, 3, 4,
5, 6, M , M
1 2
In Multiples of
Rating Plug
Amperes
(I )
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