HP PowerTrust A3589A, Manual

Page: 40 / 257

1-18 Chapter 1
Overview
Control Panel Switches and Indicators
WARNING Turning off the MAIN INPUT circuit breaker does NOT turn off the
PowerTrust UPS! Instead, the UPS goes to the "On-battery" state of
operation. See “Powering-Off the UPS for an Extended Time” in
Chapter 4.
7
Battery Connector The Battery Box is connected to the Electronics Unit using a battery
cable. The cable from the Battery Box is plugged into a connector at
the bottom of the Electronics Unit. For information on how to
connect the Electronics Unit to the Battery Box, refer to “Connecting
the Battery Box Cable to the Electronics Unit” in Chapter 3.
8
Output Circuit
Breakers
When an Output circuit breaker activates, it shuts off the AC
voltage to the corresponding output receptacle.
There are four output circuit breakers that protect the UPS from
overcurrent conditions.
The first three output circuit breakers (marked
OUTLET 1, OUTLET 2
and
OUTLET 3
) provide overcurrent protection for the IEC320 C19
outlets (see
2
in Figure 1-4). The circuit breaker marked
OUTLET 4
provides overcurrent protection for the NEMA L6-30R output
receptacle (see
3
in Figure 1-4).
The AC coming out of the corresponding output receptacle remains
off until the cause of the overcurrent is corrected, the circuit breaker
is reset, and, depending on the severity of the problem, the
UPS/BATTERY switch is cycled (turned off then back on). This
restores the UPS to normal operation. For information on the 40A
Service Bypass Unit, refer to Appendix E, “40A Service Bypass Unit:
Specifications and Procedures.”.
9
Input Circuit
Breakers
The input circuit breaker marked
BYPASS
shuts off the AC input to
the Service Bypass Unit, Electronics Unit, and the system load in
the event of an overload (overcurrent condition). If the UPS is in
Automatic or Service Bypass mode when the overload occurs, this
breaker will trip and all AC power to the attached equipment is lost.
The input circuit breaker marked
MAIN
protects the UPS and the
protected equipment from overcurrent conditions when the UPS is
operating normally from the AC line; that is, when the UPS is
neither in Bypass mode nor on battery.
The UPS remains in this condition until the cause of the overcurrent
is corrected, the circuit breaker is reset, and, depending on the
severity of the problem, the UPS/BATTERY switch is cycled (turned
off then back on). This restores the UPS to normal operation.