Carrier 69NT40-521, 69NT40-511-199 manual PRE-TRIP Selection Menu

the VENT mode is selected on the CA Controller. The user must scroll through the selection by pressing the UP ARROW or DOWN ARROW keys, then pressing the ENTER key when the selection is made. While the tests are being executed, the user can terminate the pre-trip mode by holding the PRE-TRIP key. The unit will then resume normal operation. If the user decides to terminate a test but remain at the test selection menu, the user may press the UP ARROW key. When this is done all machinery outputs will be de-energized and the test selection menu will be displayed.

The pre-trip diagnostics may also be initiated via communication, but when initiated will always attempt to execute the entire battery of tests (auto mode).

b. Current Limiting During Pre-Trip

Throughout the duration of any pre-trip mode, the Current Limit processing is active.

c. Test Codes

A detailed description of the pre-trip test codes is listed in Table 3-5.

3.2.1Pre-Trip

In this mode, the unit will automatically test unit components using internal measurements and comparison logic, and will provide a “PASS” or “FAIL” display to indicate the results of each test.

If the user depresses the PRE-TRIP key, the unit gives access to a pre-trip selection menu. The contents of the menu are as follows:

PRE-TRIP SELECTION MENU

Auto or Auto 1	Auto 2 (Optional)
P, P1, P2, P3, P4, P5,	P, P1, P2, P3, P4, P5,
P6, rSLts	P6, P7, P8, P9, P10,
	rSLts

If the pre-trip was last executed manually after power up, the last menu selection will appear on the left display. If pre-trip was not executed since power up, then the right display will show “Auto” or “Auto 1.” The user may scroll through the test selection menu using the arrow keys.

A given test is selected by pressing ENTER while it is displayed. The entire battery of tests may be run by pressing ENTER while “Auto 1” or “Auto 2” is displayed.

During this selection mode, failure to press either an arrow key or ENTER for five seconds will return the unit to its default display, and normal operating mode.

Any test may be interrupted by pressing the UP ARROW key. This will return the user to the test selection mode described above, and all machinery outputs will be de-energized.

While certain tests from “Auto 1” are running, “PX-X” will appear on the left display, where the X’s indicate the test number and sub-test. The right display will show a countdown time in minutes and seconds, indicating how much time there is left remaining in the test.

For “Auto 2,” the left display will show “PX-X,” while the right display will show applicable data.

a. Manual Test Operation

Individually selected tests, other than the LED/Display test, will perform the operations necessary to verify the operation of the component under test. At the conclusion of the selected test, PASS or FAIL will be displayed. Upon failure, the Supply and Return LED’s will flash on alternately. This message will remain displayed for up to three minutes, during which time a user may select another test. If the three minute time period expires, the unit will terminate pre-trip and return to control mode operation. Following any individually selected test, all outputs will be de-energized.

b. Auto Test Operation From Keypad

If “Auto,” “Auto 1” or “Auto 2” test is initiated, then the unit will execute a series of consecutive tests, each related to an identifiable unit component, without any need for direct user interface. These tests vary in length, depending on the component under test.

When an automatic test fails, it will be repeated once automatically. A repeated test failure will cause “FAIL” to be shown on the right display, with the corresponding test number to the left. The user may then press the DOWN ARROW to repeat the test or the UP ARROW to skip to the next test. The unit will wait indefinitely for user input. Holding the PRE-TRIP key will terminate the pre-trip mode operation.

When “Auto” or “Auto 1” is allowed to run to completion without being interrupted, the unit will exit the pre-trip mode, and return to normal control operation.

CAUTION

When “Auto 2” is allowed to run to completion without being interrupted, the unit will terminate pre-trip and display “Auto 2” “end.” The unit WILL REMAIN SUSPENDED in this mode until the user depresses the ENTER key!

T-268-07 3-18