APC BE550MC Datasheet download pdf (Page 5)

User Manual BE550MC 5

Voltage Sensitivity Adjustment (optional)

The Back-UPS detects and reacts to line voltage distortions by transferring to battery backup power to protect

connected equipment. In situations where either the Back-UPS or the connected equipment is too sensitive for the

input voltage level it is necessary to adjust the transfer voltage.

1. Connect the Back-UPS to a wall outlet. The Back-UPS will be in Standby mode, no indicators will be

illuminated.

2. Press and hold the Power On button for 10 seconds. The LED will illuminate alternately green-amber-red,

to indicate that the Back-UPS is in Program mode.

3. The Back-UPS will indicate the current sensitivity level. Refer to the table below for an explanation of the

transfer voltage sensitivity levels.

4. To select LOW sensitivity, press and hold the Power On button until the LED flashes green.

5. To select MEDIUM sensitivity, press and hold the Power On button until the LED flashes red.

6. To select HIGH sensitivity, press and hold the Power On button until the LED flashes amber.

7. To exit Program mode wait five seconds and all LED indicators will extinquish. Program mode is no

longer active.

LED color flashes Sensitivity Setting Input Voltage Range Use Indications

Green LOW 88 V to 142 V Input voltage is extremely low or extremely

high.

Not recommended for computers.

Red MEDIUM

(factory default)

92 V to 139 V Use when the Back-UPS frequently switches

to battery operation.

Amber HIGH 96 V to 136 V Use when connected equipment is sensitive to

voltage fluctuations.

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APC BE550MC Datasheet Page 5