OnLine Power Phase Stabilizer - Manual (Page 49)

OnLine Power
6002-032 REV H 3-10
3-1-9 Calibrate Control Logic Board
The SCR driver board has seven green LEDs. LED 7 indicates power is applied to the board and is illuminated
any time power to the unit is on. LEDs 1 through 6 represent tap settings and only one of these six LEDs
should be on at any time. See Illustration 3-2. It is normal for the LED’s 1 through 6 to delay 6 seconds after
the power LED has turned on.
If no LED is lit or if two or more LEDs are lit, immediately turn facility circuit breaker OFF or turn IMCB to OFF (if
installed). The regulator can be placed on manual operation for emergency service. See Section 1-7-2.
If only one LED (1 through 6) is lit, perform the following calibration:
PROCEDURE:
1. Turn connected load OFF.
2. Turn facility circuit breaker OFF, lock and tagout in accordance with OSHA Lockout/Tagout requirements.
3. Open Power-Reg, Ultra-Reg, Phase Stabilizer (100 - 400 kVA) as follows:
a. Remove front panel by unbolting six screws at corners and left and right sides of each panel.
4. Open CP 18, Phase Stabilizer (15 - 75 kVA) as follows:
a. Open front door.
b. Set IMCB to OFF (as applicable).
c. Open hinged front panel by unbolting three screws at left side of panel. Swing panel to right.
5. Unlock facility circuit breaker and turn ON.
6. Set IMCB to ON (as applicable).
7. Turn connected load ON.