User manual
54 Maintenance
UM6C28C P0728920 Standard 11.00 April 2001
Emerson Energy Systems
Procedure 1 – Replacing the NT6C14PF controller card ( continued )
Step Action
14
Turn the TST ADJ potentiometer slowly counterclockwise and verify
that the LV ALM indicator lights up at the appropriate voltage level. If
the LV ALM indicator lights up before the appropriate voltage level is
reached or does not light up, adjust the LV ADJ potentiometer until
the LV ALM indicator lights up at the appropriate voltage level.
15
If the system is provided with an LVD feature, slowly turn the TST
ADJ potentiometer counterclockwise and verify that the LVD ALM
indicator lights up at the appropriate voltage level. If the LVD ALM
indicator lights up before the appropriate voltage level is reached or
does not light up, adjust the LVD ADJ potentiometer until the LVD
ALM indicator lights up at the appropriate voltage level.
16
Turn the TST ADJ potentiometer slowly clockwise and verify that the
LV ALM indicator extinguishes at the appropriate voltage level.
17
If the system is provided with an LVD feature, slowly turn the TST
ADJ potentiometer clockwise and verify that the LVD ALM indicator
extinguishes at the appropriate voltage level. If the LVD ALM
indicator extinguishes before the appropriate voltage level is
reached, or does not extinguish, adjust the LVDR ADJ potentiometer
until the LVD ALM indicator extinguishes at the appropriate voltage
level.
18
Put the BYPASS/NORMAL switch in the NORMAL position. The TST
BYPASS indicator should extinguish.
19
Reinstall the sense fuse on the front door of the control and
distribution panel, and close the connector going to the controller
card ( opened in step 5 ).
20 Operational tests
Put the EQL switch in the ON position. Verify that the voltage on the
rectifiers increases to the equalize voltage level and stays at that
level until the EQL switch is returned to the OFF position.
21
Verify that the circuit breaker and fuse alarm is functional by
depressing the alarm pin on one of the F1 to F4 QFF fuses, or by
inserting a blown fuse in one of the fuse positions. Verify that the red
FA LED lights up and that a major alarm is triggered. Release the
alarm pin or remove the blown fuse. Verify that the alarm conditions
have been canceled.
22
Test the RFA alarms by shutting down one rectifier. Verify that the
yellow RFA MIN LED lights up and that a minor alarm is triggered.
23
Shut down a second rectifier. Verify that the red RFA MAJ LED lights
and that a major alarm is triggered.
24
Restart the rectifiers and verify that the alarm conditions have been
canceled.
25
If the system is provided with an LVD feature, remove the electrically
isolated tool installed in step 4.
continued