HP PowerTrust A3589A Manual page 36

Overview
Control Panel Switches and Indicators
Bypass Switch
10
Activation Button
CAUTION Do not push the red button while the UPS is operating on battery. Damage to
the connected equipment can occur.
Service Bypass
11
Switch
Should the AC power fail while the Service Bypass switch is set to
CAUTION
of the connected equipment will lose power immediately.
The PowerTrust UPS output is not protected by the MAIN INPUT circuit
breaker when in Bypass mode; instead, it is protected by the BYPASS INPUT
breaker. The Bypass switch should always be in the
instructed otherwise by a Hewlett-Packard service representative.
1-14
This red button must be pressed to change the Service Bypass switch
setting from to
NORMAL
to change the setting from
put the UPS into Automatic Bypass mode. To avoid loosing AC power
to the protected equipment, you should always check that the BYPASS
INPUT circuit breaker is ON before pressing this button.
This rotary switch allows you to isolate and disconnect the AC input
from the Electronics Unit and batteries so that these components can
be serviced without disrupting power to the connected equipment. This
switch is also used to manually override automatic bypass.
The bypass switch can be set to two positions,
Normal Mode. When the switch is set to
source provides power to the Electronics Unit. Should the AC power
fail while the Service Bypass switch is set to
automatically switches to On-battery mode. When input power is
restored, the Electronics Unit returns to On-line mode.
Bypass Mode. When the switch is set to
bypasses the Electronics Unit but continues to supply power to the
load.
The setting is used to service the Electronics Unit or Battery
BYPASS
Box. The UPS cannot switch to battery power if AC input power is lost
when the Service Bypass switch is set to
. (The button does not have to be pressed
BYPASS
to .) Pressing this button will
BYPASS NORMAL
NORMAL
NORMAL
BYPASS
BYPASS
NORMAL
and .
NORMAL BYPASS
, the AC power
, the UPS
, the AC power source
.
, all
BYPASS
position, unless
Chapter 1