Installation and start-up procedures 67

Low voltage alarm (LVA) adjustment

Procedure 18 - Low voltage alarm adjustment

Step

Action

1Turn the test potentiometer counterclockwise until the voltage reading on the meter is -47 V. Turn LVA potentiometer R20 (located below the LVA LED) clockwise until the LVA LED lights up, or counterclockwise until it extinguishes.

2Reinstall the LVD unit faceplate removed in Procedure 17.

–end–

LVD/low voltage disconnect / reconnect (LVDR) adjustment

WARNING

Do not switch the NORMAL/BYPASS switch back to the NORMAL position if the LVD/LVDR potentiometers are readjusted and their adjustments are not completely verified. Doing so can cause loss of power to the load.

Note 1 : To ensure that the potentiometer is turned fully counterclockwise, the pot must be turned 20 full turns, or until a click sound, emitted by the pot's clutch, is heard.

Note2 : The effect of the LVDR potentiometer in setting the reconnect voltage level is approximately 1.6 V for each turn for Rel. 2 and 2A, or approximately 0.75 V for Rel. 3 and 3A. The connect/disconnect voltage difference is smaller when the LVDR potentiometer is turned counterclockwise and larger when it is turned clockwise.

Procedure 19 - Low voltage disconnect/reconnect adjustment

Step

Action

1Turn the LVD and the LVDR potentiometers fully counterclockwise.

2Turn the LVDR potentiometer four turns clockwise for Release 2 and 2A, or 9 turns for Release 3 and 3A.

3Adjust the voltage measured at the test jacks to -43.5 V with the Test potentiometer.

4Turn the LVD potentiometer clockwise until the LVD LED lights up.

continued

25A Switch Mode RectifierNT5C06B / C Installation and User Manual

Page 67
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Emerson MPR25, MPR15 Series Low voltage alarm LVA adjustment, LVD/low voltage disconnect / reconnect Lvdr adjustment

MPR15 Series, MPR25 specifications

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