Chapter 11 – ‘1+N System’ Liebert Hipulse E User Manual
Single or '1+N' UPS System
Page 11-12 (07/04)
12. Close the external UPS Switch (Q4MBC). The Maintenance Bypass supply is now in parallel with the UPS Static
Switch supply. All the UPS should be displaying the messages “Load on Bypass” and “Inverter Off via Display”.
All the UPS mimic diagrams should have the amber “Load on Bypass” and green “Bypass OK” LEDs active
(#1 and #6, refer to Figure 8-2).
13. Open the external Maintenance Bypass Switch (QBYP).
The load is now being supplied through the UPS static bypasses.
14. Take the key (BP2) to the KX box (Key Exchange Box), insert and rotate.
15. Remove the BP1 keys from the KX box, and turn on the UPS inverters one at a time. Some time during this
process, the load will transfer from static bypass to UPS.
The Module Mimic LED's will change so that the Module Mimic LED's will change so that the Load on inverter ( 5 )
will light steady green and the Load on bypass ( 6 ) will extinguish.
Depending on the UPS system setup, when the number of modules available reaches the number needed in the setup,
the inverters will automatically restart.
The message shown below, will be seen on the default screen whenever the
UPS is operating normally:
The UPS is operating normally with its inverter supplying the load.
NORMAL OPERATION
HH.MM.SS DD.MM.YY
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