HP PowerTrust A3589A, Manual

Page: 37 / 257

Chapter 1 1-15
Overview
Control Panel Switches and Indicators
WARNING If the Service Bypass switch is in the
BYPASS
position, voltage may still
be present at the output! This is true regardless of the
UPS/BATTERY switch setting.
12
UPS/BATTERY
Switch
This slide switch enables or disables operation of the UPS. In the
ENABLE
position (switch to the right), the UPS functions normally.
Depending on other conditions, there may be voltage present at the AC
output, and the UPS may be charging or discharging its batteries.
Unless the UPS is in Bypass mode, it is completely disabled when this
switch is in the
DISABLE
position (switch to the left); there is no voltage
present at the AC output, and the UPS is neither charging nor
discharging its batteries. The switch should be left in the
DISABLE
position if the UPS is disconnected from AC input power or the system
is shut down for an extended period of time.
Cycling this switch — moving the switch to the
DISABLE
position and
then back to the
ENABLE
position — resets all UPS conditions except
an Emergency Power Off (EPO) shutdown and an automatic bypass
condition.
13
Enable Light This green light indicates that the UPS is enabled and operating.
The Enable light is normally on if the UPS/BATTERY switch is set
to
ENABLE
. However, there are two exceptions:
1. If the UPS/BATTERY switch is set to the
ENABLE
position
while the AC input power is off, the Enable light flashes,
and then remains off until AC input power returns.
2. If the batteries discharge while AC input power is off and
the Output On/Output Off switch is set to
Output On
, the
Enable light turns off. It remains off until AC input power
returns.
14
Output Receptacle
Cover
The cover that prevents the connectors in the output receptacles
from being accidentally unplugged.
15
Precharge Failure
LED
When flashing, this red LED indicates that the voltage on the main
inverter has not precharged properly and that the Battery
Precharge Shorting Plate must not be installed.
16
Battery Precharge
Shorting Plate
This plate is used to prevent the battery from being directly
connected to an unenergized inverter assembly. It must be removed
to attach the battery cable and, when reinstalled, provides a low
resistance, direct current path from the battery to the main
inverter.
17
Caution Light This light warns that the UPS should not be switched into or out of
Bypass mode.