I.B. 29C892B

Page 21

SHORT DELAY TRIP

TRIP TIME

.03s

Figure 3-32 Typical Cause of Trip Message

grammer on. If the programmer is directly connected to a trip unit, it will momentarily identify the baud rate and address, and move to the main menu (Figure 2-9). If the programmer is INCOM connected, proceed with Steps 2, 3 and 4, otherwise move directly to Step 5.

Step 2: Once the main menu is displayed, use the Select pushbutton to enter Se l e c t Ad d r e s s

( S A ) which is active as indicated by the blinking cursor. This network display provides a means for selecting the three digit address of the circuit breaker of interest within the network (Figure 3 - 1 6). The blinking cursor indicates which of the three digits is active and able to be changed.

Step 3: Use the Up or Down pushbuttons to change the active digit. Use the Right-Arrowor Left- Arrow pushbuttons to move the cursor from one digit to another.

Step 4: Once the desired breaker address is displayed, hold Save pushbutton depressed and depress Select pushbutton. This simultaneous use of the two pushbuttons will enter the address of the circuit breaker in question, and the main menu will be displayed.

Step 5: Use the Right-Arrow or Left-Arrow pushbuttons to move the cursor to Metered Values (ME) in the main menu (Figure 3-22).

Step 6: Use the Select pushbutton to enter Metered Values (ME) and the first four metered values are displayed with the blinking cursor indicating that Phase A Current is active (Figure 3-23).

Step 7: Use the Right-Arrow or Left-Arrow pushbuttons to move the blinking cursor to a metered value of interest, Phase B current for example (Figure 3-24).

Step 8: Use the Select pushbutton to choose the metered value of interest and have the present value displayed (Figure 3-25).

Step 9: Repeating Steps 7 and 8 will permit the viewing of all the metered values outlined in Table 2.1.

Step 10: Use the Up-Arrowpushbutton to return to the main menu (Figure 2-9).

3-9 TEST TRIP UNIT

Digitrip OPTIM 550, 750 and 1050 Trip Units contain a test capability. One of the means for performing tests is through the use of the OPTIMizer Hand Held Program- mer. The intent is to permit the periodic performance of tests that verify the functional performance of the trip unit. Two types of testing are possible through the use of the OPTIMizer Hand Held Programmer, the “No-Trip” and the “Trip” tests.

No-Trip Test: This test can be performed using the internal battery power of the programmer. It verifies that the trip unit is performing under test within acceptable limits of the programmed protective setpoints.

Trip Test: This test can only be performed using external power supplied by an Auxiliary Power Module or by auxiliary power supplied to the circuit breaker. The additional power is required to activate the breaker’s flux transfer shunt trip. This test verifies the trip unit’s perfor- mance, as well as the trip circuitry and mechanical operation of the circuit breaker.

Notice: Keep in mind that an Auxiliary Power Module is required to perform a “Trip” test. Refer to paragraph 2-2.2 for details on the use of an Auxiliary Power Module.

Notice: Basic protection functions are not affected during the performance of testing procedures.

Proceed with the following steps to perform a “Trip” or a “No-Trip” test:

Step 1: With the programmer turned on and the main menu displayed, use the Right-Arrowor Left- Arrow pushbuttons to move the blinking cursor to Test Mode (TM) (Figure 3-26).

Step 2: Use the Select pushbutton to enter the Test Mode (TM). The blinking cursor indicates which test category is active and able to be selected (Figure 3-27).

Step 3: Use the Right-Arrow or Left-Arrow pushbut- tons, if required, to move the blinking cursor to a different test category. Use the Select push-

Effective 8/99