User manual

7
An optional LED panel (shown below) is available for the UT3120, UT3160, and UT3220. This
panel gives you information about the unit’s operation modes and about the cause of alarms. The
drawing below shows the panel and points out each LED (light) on the panel. Table 1 explains what
each LED means when it is green and what it means when it is red.
Figure 3: Display Unit with Optional LED Panel for the UT3120, UT3160, and UT3220
TABLE 1 - Optional LEDs
LED What It Means When It’s Green What It Means When It’s Red
1 The bypass mains (voltage) is acceptable. The bypass mains (voltage) has failed.
2 This LED is never green. There is a bypass static switch alarm.
3 Mains (AC input) is acceptable. Mains (AC input) has failed.
4 This LED is never green. There is a mains static switch alarm or
charge regulation error alarm.
5 This LED is never green. There is an inverter alarm.
6 The battery is connected and working. The battery is disconnected or there is a
battery alarm.
7 The inverter is on. This LED is never red.
8 The bypass is on. This LED is never red.
9 Output voltage is acceptable. Output voltage is outside tolerance: it is
outside of the unit’s programmed limits.