Effective 11/2003
Page 31
I.L. 66A7535H02
Press
Save
twice to initiate the test. If a pickup level is not
exceeded, the unit will remain in a “testing mode” for three
hours or unitl interrupted by a real event or user pushbutton
activity.
See Appendix D-20 for pushbutton sequence to conduct
the testing.
To conduct this testing as well as viewing
setting (if applicable) a small Auxiliary Power Module, Cat.
No. #PRTAAPM, is available for these functions.
This Module is an intermittent duty device that is powered
via 120 VAC, 50/60 Hertz and will plug into the upper right
corner of the product
(See Figure 1.1).
A 230 VAC module
is also available.
When performing a trip unit self test in TRIP mode,
tripping
of the circuit breaker and
activation
of the
associated Alarm or Accessory Bus relays can occur. This
is important to consider before initiating a test, since a
breaker or relay action can initiate other equipment
responses in the system even if the breaker is in test
position of a switchgear cell.
In the NON-TRIP mode of self test, the breaker trip function
and any associated relay will not operate when test alarm
or test trips occur. The front panel indicating LED will light
as well as display alarm/trip cause and trip time informa-
tion.
The Self Test function cannot be entered if an alarm is
already present. This alarm will need to be cleared before
any self testing can be conducted. The self test function
will terminate if any of the following conditions occur after
the start of testing:
1. Any real Phase current exceeds an alarm setting
2. Any real Ground current exceeds 0.1 per unit.
3. If real Phase current exceeds 1 x (
I
r) while
conducting a NON-TRIP test.
4. If real Phase current exceeds 0.5 x (
I
r) while
conducting a TRIP test.
5.2.2 Functional Field Testing
CAUTION
PERFORMING TESTS WITHOUT THE CUTLER-HAM-
MER-APPROVED TEST KIT MAY DAMAGE THE DIG-
ITRIP UNIT.
Use the test receptacle to verify a functional load test of a
major portion of the electronic circuitry of the Digitrip and
the mechanical trip assembly of the breaker. The testing
can determine the accuracy of the desired trip settings by
WARNING
ANY TRIPPING OPERATION WILL CAUSE DISRUPTION
OF SERVICE AND POSSIBLE PERSONAL INJURY,
RESULTING IN THE UNNECESSARY SWITCHING OF
CONNECTED EQUIPMENT.
CAUTION
TESTING A CIRCUIT BREAKER WHILE IT IS IN-SER-
VICE AND CARRYING LOAD CURRENT IS
NOT
RECOM-
MENDED.
TESTING OF A CIRCUIT BREAKER THAT RESULTS IN
THE TRIPPING OF THE CIRCUIT BREAKER SHOULD
BE DONE ONLY WITH THE CIRCUIT BREAKER IN THE
TEST OR DISCONNECTED CELL POSITIONS OR
WHILE THE CIRCUIT BREAKER IS ON A TEST BENCH.
IF ANY “VOLTAGE PROTECTION” FUNCTIONS ARE
ENABLED, THEY WILL NEED TO BE TEMPORARILY
DISABLED BEFORE THE CURRENT PROTECTION
TESTING IS INITIATED.
5.2 When To Test
Testing prior to start-up can best be accomplished with the
breaker out of its cell or in the Test, Disconnected, or
Withdrawn (or Removed) cell positions.
NOTE:
Since time-current settings are based on desired
system coordination and protection schemes, the protec-
tion settings selected and preset in accordance with
Section 4 should be reset to their as-found conditions if
altered during any routine test sequence.
5.2.1 Self Testing
Prior to any self testing, the plexiglass cover will need to
be removed.
The Digitrip 1150V provides means via the TEST selection
in the main menu to conduct Phase Current (PH) or
Ground Current (GND) type testing in either a TRIP or
NON-TRIP mode.
Enter the Test Menu, and using the Edit Up/Down
pushbuttons, set the desired test current level. A test level
chosen above a setting will cause a pickup/trip condition.
