Led Interpretation - Liebert 7200 Series User Manual

7200 Series UPS User Manual
Single Module and 1+1 Parallel System
6.2

LED interpretation

The Item number refers to the details shown in figure 6-1.
ITEM NORMAL
NUMBER STATE
1 ON
2 ON
3 OFF
4 OFF
5 N/A
6 N/A
7 OFF
8 OFF
9 OFF
document in response to "powersure ups"
If this green led is OFF it signifies a problem with the bypass input a.c.
Check the following:
a) Bypass input power switch Q2 is closed.
b) Input supply voltage is within 10% of nominal.
c) Power supply fuses are OK - LS1, LS2 on the a.c. Power Supply board will extinguish if
either fuse is ruptured.
If the above checks prove unsatisfactory then seek qualified assistance.
If this green led is OFF it signifies that the inverter is not producing its correct output voltage.
Check the following:
a) If [OVERTEMPERATURE] or [OVERLOAD] alarm messages are active then (after allowing
the UPS to cool / checking that the load current on the bypass line is not excessive) press the reset
switch (S1) on the UPS Logic Board.
b) If the d.c. busbar is below 320V d.c. for 380 V a.c. system, 330V d.c. for 400 V a.c.. system
or 340 V d.c. for a 415 V a.c. system then do the checks as per `Rectifier Block'- input failure
items 15,16,17 & 18 in the following table
c) If the inverter works OK when mains is available but not when mains is unavailable then
check the battery power fuse F13.
If the above checks prove unsatisfactory then seek qualified assistance.
If this yellow led is ON (flashing) then it signifies that the load has been transferred to the static
bypass supply. If this is an automatic change over it will be accompanied by a fault warning on the
display panel: take the appropriate actions for the display indication (see Display alarm message
table).
If this yellow led is ON it signifies that the battery is not available. This could be due either to the
battery circuit breaker being open or that the d.c. busbar voltage is below the figures stated in (2)
above.
The battery circuit breaker will open automatically if the d.c. voltage falls below these levels.
Check the following:
a) Battery circuit breaker is closed.
b) DC busbar voltage — if not above 320V
then carry out checks as per 1 (mains failure) above. If the d.c. busbar voltage is greater than
320V but you are unable to close the battery circuit breaker then seek qualified assistance.
c) If the battery circuit breaker trips as soon as mains power is disconnected then check the
battery power fuse (F13).
This is a bar graph indicating the % of the total load that is being applied to the system under
normal running conditions several of these LEDs would be ON.
This is a bar graph indicating the battery charge state and would normally have four or five of the
LEDs ON. When the unit runs on battery, this bargraph changes to give an indication of the time
remaining on battery as 2 minutes per led.
If this yellow led is ON it signifies that the applied load has exceeded the maximum. It will be
accompanied by all five load bargraph LEDs being ON (item 5), the Alarm warning indication
flashing RED(item 9) and an OVERLOAD message on the visual display. This will be accompanied
by an audible warning. Reduce the load immediately.
If this yellow led is ON it signifies that the battery voltage is low and that the end of battery
discharge is near (normally two minutes). This will be accompanied by an audible warning
This red LED will flash on and off and indicates that the UPS has detected a fault, it will be
accompanied by a message on the display panel, take the required actions for the display panel
message (see Display alarm message table). This will be accompanied by an audible warning.
INTERPRETATION - ACTION
Chapter 6 - Trouble shooting
LED interpretation
Page 6-3
Issue 6
(03/98)