Ground Fault Current Setting; Ground Fault Time Delay Setting; Incom Communications (520Mc Model Only); Breaker Interface Module (Bim) - Eaton Cutler-Hammer Magnum Digitrip 220+ Instructions Manual

I.L. 70C1037H04
Setting Inst.
x n I
6
M1 value is specified on rating plug.
*No OFF on Digitrip 220.
Figure 4.6 Instantaneous Current Settings

4.7 Ground Fault Current Setting

The 8 Ground Fault Current Settings are labeled with
values from .25 to 1.0 x (In) (see Figure 4.7). The domestic
(U.S.) models have a maximum of 1200A, limited by the
firmware of the unit, as shown in Table 1.1 and Table 2.2.
The specific Ground Current Settings for each model are
listed in Table 2.2 and on the applicable time-current curve
for the breaker.
Gnd-Fault
Setting
.4 x n I
Figure 4.7 Ground Fault Current Settings

4.8 Ground Fault Time Delay Setting

As illustrated in Figure 4.8, there are two different Ground
Fault curve shapes: fixed time (FLAT) or I
shape selected depends on the type of selective coordina-
tion chosen. The I t response will provide a longer time
2
delay for current below 0.625 x In than will the FLAT
response.
Five FLAT (.1, .2, .3, .4, .5 seconds) and three I
.5* seconds) response time delay settings are available.
The I 2 t response settings are identified by an asterisk (*).
The I t response is applicable to currents less than 0.625
2
times the ampere rating of the installed rating plug (In). For
currents greater than 0.625 x (In) the I
the FLAT response.
NOTE: Also see Section 3.4, Zone Interlocking.
Effective 7/1/2003
Courtesy of NationalSwitchgear.com
Available Settings
2, 3, 4, 6, 8,
10, M1, OFF*
In Multiples of
Rating Plug
Amperes ( n) I
Available Settings
0.25, .3, .35, .4,
.5, .6, .75, 1.0
Specific Values
Given on Circuit
Breaker Time-Current
Curve and in Table 2.2
t response. The
2
2 t (.1*, .3*,
t response reverts to
2
"*" On Label
Indicates
2
I t Shape
Figure 4.8 Ground Fault Time Delay Settings
4.9 INCOM (Digitrip 520MC Models only)
INCOM communication to a host computer or a BIM is
possible with the Digitrip 520MC unit. The address range is
001 through 999. The factory default address is 999 hex.
To set the desired address or to view the address, depress
and hold the RESET/BATTERY TEST button for five
seconds. Depress the STEP button to select a new
address. Users may simultaneously depress and hold in
the STEP and RESET/BATTERY TEST buttons for fast
advance.

4.9.1 Breaker Interface Module (BIM)

The Breaker Interface Module (BIM) can be used to
monitor up to 31 Digitrip 520MC trip units. The acceptable
addresses are 001 through 031.
4.9.2 Remote Master Computer
When desired, Digitrip 520MC Trip Units can communicate
with a BIM or remote master computer (IBM PC compat-
ible with Cutler Hammer Inc. CONI card or MINT ) and
using PowerNet communication software version 3.20 or
greater. (See Figure 4.9 for typical wiring.)
Page 23
Gnd. Fault
Time
Sec.
.3
Available Settings
.1, .2, .3, .4, .5
Seconds with
FLAT Response
I t Shape 2
Returns to FLAT
Response at
Approximately
0.625 n I
.1*, .3*, .5*
Seconds with
I t Shape 2