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User Manual
Single or '1+N' UPS System
9.6
Procedure for completely powering down a UPS
This procedure should be followed to completely power down the UPS and LOAD. All power switches, isolators and
circuit breakers will be opened and there will be no load power.
1. Open the battery circuit breaker and the Rectifier input power switch Q1.
The Module Mimic indicator Load on Inverter ( 5 )will extinguish and the Load on Bypass indicator ( 6 ) will flash
amber. The battery not available indicator ( 3 ) will light amber and the battery bar graph LED's will all
extinguish.
LOAD ON BYPASS
BATTERY C.B. OPEN
RECTIF. SWITCH OPEN
HH MM SS
DD MM YY
Note: In ECOMODE the message 'LOAD ON BYPASS' will not appear.
2. Open the Output power switch Q4 and the bypass power switch Q2.
All operator LED indications and messages will extinguish as the mains driven internal power supplies decay.
3. To completely isolate the UPS from the a.c. supplies, the main external power input isolator (both isolators, where
separate supplies are provided for rectifier and bypass ) should be opened.
On the primary input distribution panel, which is often located distant from the UPS area, a label should be posted
advising service personnel that the UPS circuit is under maintenance.
WARNING: Wait 5 minutes for the internal d.c. bus bar capacitors to discharge.
The Maintenance Bypass Power switch may be operated at any time when the UPS is powered down to connect the
load to the maintenance bypass supply if required.
The load equipment is not protected from normal supply aberrations when operating in the maintenance bypass
mode.
The following procedure will switch off all power to the load equipment.
The display window will show messages reflecting the actions taken ( i.e.
Load on Bypass: Battery Breaker open: Rect. switch open: etc. ).
The UPS is now completely powered down.
Liebert Hipulse E
Caution
WARNING
IMPORTANT
(07/04)
Chapter 9 - Operating Instructions
Procedure
Page 9-9
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