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User Manual
Single or '1+N' UPS System
10 Chapter 10 - Display Panel Interpretation
10.1
LED interpretation
The Led Item number refers to the details shown in figure 8-2 and the Led references that are identified there.
LED
NORMAL
NUMBER
STATE
1
ON
2
ON
3
OFF
4
ON
5
ON
6
OFF
Liebert Hipulse E
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.
If the above checks prove unsatisfactory then seek qualified assistance.
If this LED is off, a problem exists in the input power supply or in a part of the rectifier. An alarm
message is visible at the display.
Check that:
a)
The rectifier input isolator (Q1) is closed.
b)
The input voltage is within the limits of normal operation.
c)
The phase sequence of the mains input is correct.
d)
Verify that condition leading to an emergency stop has not happened, in which case a Reset
must be carried out (see Chapter 9 – Operating Instructions).
If these checks do not give a positive result, request qualified assistance.
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
(item b) above.
The battery circuit breaker will open automatically if the d.c. voltage falls below these levels.
Check the following:
a)
Check that the conditions for Led 2 are satisfied.
b)
DC busbar voltage — if not above 320V
then carry out checks as for Led 2 (mains rectifier 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)
Battery circuit breaker is closed.
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)
use the procedure to carry out the reset (see Chapter 9 Operating Instructions).
b)
Check that the conditions for Led 2 are satisfied.
c)
Check that the Inverter led (8 yellow) is OFF, otherwise follow Inverter switch ON procedure.
d)
Check that no conditions exist which will prevent switching the INV ON (e.g. PC command).
e)
Verify that condition leading to an emergency stop has not happened, in which case a Reset
must be carried out.
If the above checks prove unsatisfactory then seek qualified assistance.
If this green led is OFF, 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 10.2).
This led is mutually exclusive to Led 5. If this amber Led is ON, the load has been transferred to the
bypass mains supply. Verify the cause by following the alarm indications at the LCD display panel.
If the above checks prove unsatisfactory then seek qualified assistance.
INTERPRETATION - ACTION
(07/04)
Chapter 10 - Display Panel Interpretation
Page 10-1
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