14
Instruction Leaflet
IL29C614F
Effective December 2011
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
EATON CORPORATION
www.eaton.com
should not trip, and the alarm indicator, if supplied, should
not operate. Repeat the test on the other two phases.
If the system is a 3-wire system with no neutral current
sensor, apply the same current as described above
through any two phases of the breaker, with the connec-
tions exactly as shown in Figure
15-3
. The breaker
should not trip, and the alarm indicator, if supplied,
should not operate. Repeat the test using the other two
combinations of breaker phases.
Figure 15-3 Connections for Ground Fault No-Trip Test,
with a Three-Wire System.
Current-Limiting
Resistor
(If Required)
Source
L
C
R
Low
Voltage
Source
The results of the test are to be recorded on the test
form provided with the equipment.
FIELD TESTING SHOULD BE USED FOR FUNCTION-
AL TESTING AND NOT FIELD CALIBRATION OF
THE DIGITRIP RMS 310 GROUND FAULT TRIP UNIT.
ANY TEMPORARY CONNECTION MADE FOR THE
PURPOSE OF CONDUCTING TESTS SHOULD BE
RESTORED TO PROPER OPERATING CONDITIONS
BEFORE RETURNING THE BREAKER TO SERVICE.
!
CAUTION
Polarity
Marks
Current-Limiting
Resistor
(If Required)
Load Side
Line Side
I
I
I
I
L
C
R
N
Low
Voltage
Source
Figure 15-4a Connections for a Trip Test on Ground
Fault when testing the lowest of pickup setting.
Current-Limiting
Resistor
(If Required)
I
I
I
L
C
R
Source
Low
Voltage
Source
Figure 15-4b Connections for Ground Fault Trip Test
with a Three-Wire System when testing the lowest GF
pickup setting.
(0-24 volt), high current, AC source, apply a test
current of 125% of the Digitrip RMS 310 Ground
Fault Trip Unit pick-up setting through one phase
of the circuit breaker, as shown in Figure
15-1
.
should cause the breaker to trip in less than 1 second,
and if an alarm indicator is supplied, it should oper-
ate. Reset the breaker and the alarm indicator. Repeat
the test on the other two phases.
If the system is a 4-wire system with a neutral current
sensor, apply the same current as described above
through one phase of the breaker, returning through the
neutral sensor, as shown in Figure
15-2
. The breaker
For all other GFPU settings, using a low voltage
This
