User manual

Provider Manual
15
NOTE: If the display backlight is off, the first press of a control key
turns the backlight on and does nothing else. The normal key
action is suppressed until you press the key a second time.
The instructions in this manual assume that the backlight is
already on.
4.2.2 ALARM AND POWER INDICATORS
Figure 4–3 shows the Harmony’s alarm and power indicators.
AC Power
DC Power
ALARMS
A
C Power
Indicator
DC Power
Indicator
High Priority
Alarm LED (RED)
Low/Medium Priority
Alarm LED (Yellow)
Figure 4–3 Harmony Alarm and Power Indicators
AC Power Indicator This green LED lights up when the Harmony
is connected to AC Power.
DC Power Indicator This green LED lights up when the Harmony
is connected to DC power.
Red Alarm Indicator The red LED lights up when a high priority
alarm occurs.
Yellow Alarm Indicator This yellow LED lights up when a medium or
low priority alarm occurs.
NOTE: All LED indicators turn on during the System Self Test screen.
4.2.3 DISPLAY SCREEN
The display shows you the current pressure control settings and dis-
plays alarm messages. A backlight activates when the User buttons are
pressed and remains on until there are no keystrokes for one minute.