PowerWAVE 9000 DPA UPS - Operation
4-11
(Issue 2.1 Oct. 2009)
When the UPS is operating in “Bypass Mode”, the efficiency of the system
is slightly higher. In the event of a mains failure the load will automatically
be transferred from mains to inverter within 5 mSec. The battery charger
remains active in the “Bypass-Mode”.
The “Bypass-Mode”, is recommended only if the critical load can tolerate
interruptions of 3-5 mSec (transfer time from Bypass Mode to ON-LINE
Mode).
IN ORDER TO PROVIDE THE LOAD WITH MAXIMUM PROTECTION
UNINTERRUPTIBLE POWER SUPPLIES LTD. ALWAYS RECOMMEND
THAT THE LOAD BE SUPPLIED BY THE INVERTER (ON-LINE-MODE).
4.4.3 “Maintenance Bypass” Mode
The Maintenance Bypass Mode is performed by means of the IA1
BYPASS SWITCH on the front of the UPS:
BEFORE TRANSFERRING THE LOAD TO MAINTENANCE BYPASS
(IA1) ALWAYS MAKE SURE THE UPS-SYSTEM IS IN THE “BYPASS-
MODE” OR “ECO-MODE”.
IA1
SWITCH POSITION
EFFECT
ON
Bypass-Switch Closed (Load supplied directly from
mains).
LCD-indication: “MAINTENANCE BYP CLOSED”.
LED Indicators will indicate as shown in table below.
OFF
Bypass-Switch Open - Normal operating condition (Load
supplied by inverter).
LCD-indication “MAINTENANCE BYP OPEN”.
LED Indicators will indicate as shown in table below.
LED Indicator
IA1 ON
IA1 OFF
LINE 1
Green
Green
LINE 2
Green
Green
BYPASS
Green
OFF
INVERTER
RED
Green
BATTERY
Green
Green
MAINS
UPS
MAINTENANCE
BYPASS
LOAD
IA1