temperature of the computer.
Surge factor
This term is often mistakenly related to the surge suppression characteristic of
a UPS or surge suppressor, which is a different and unrelated characteristic.
Surge factor relates to the momentary overload capacity of the UPS and is a
measure of the ability of the UPS to start-up loads which temporarily require
extra power when they start-up. Examples of loads which have a high surge factor
requirement include motors and disk drives.
For typical computer systems with hard disk drives, the surge factor required is
approximately 1.15 times the steady-state power consumption. For large systems
with disk arrays, the surge factor required can be approximately 1.5 times the
steady-state power consumption.
All PowerStar UPS systems have enough surge factor capability to
start typical hard disk loads even when the UPS is operated at the full power
rating.
3. Information On Internal PS-1501vi Temperature Ratings and Cooling
INFORMATION: The internal temperature of the -UPS can be easily monitored
via APC's PowerChute plus software. This temperature value is logged into
PowerChute's data log file (PWRCHUTE.DAT) and is also displayed in the main
screen of the PowerChute plus Graphical User Interface. The typical accuracy of
this measurement is
"
5% of the full scale value of 100
!
C. The temperature rise
inside the unit is dependent upon several factors, including both the outside
ambient temperature, regardless of whether the unit is on line or on battery,
and the load which is applied to the output of the UPS.
The normal operating temperature while the UPS is on line at 25
!
C ambient is
approximately 45
!
C (113
!
F). This temperature rise is due to the power
dissipation of both the battery charger and the output transformer. In the worst
case condition, during battery discharge at high ambient (40
!
C) and with full
computer load, the inside temperature should not exceed 75
!
C (167
!
F). All
variants of the -UPS 1400, -UPS 2200, -UPS 3000 models contain
cooling fans. Fan cooling is on during four normal, albeit infrequent, modes of
operation. These modes are listed as follows:
1 ) The fan is on whenever the UPS is operating on battery.
2 ) The fan is on when the UPS' internal ambient temperature exceeds 60
!
C
(140
!
F). When cooled to below 50
!
C (122
!
F), the fan is shut off.
3 ) The fan is on when the output load rises to above 75% of full rated load of
the UPS. When the load is reduced to below 70% of full rated load, the fan is
shut off.
4 ) The fan is on when the battery charger is delivering power subsequent to a
utility outage.
The -UPS will operate within all ratings over an ambient temperature range
of 0
!
C to +40
!
C (32
!
F to 104
!
F).
4. Troubleshooting Guide for -UPS models and the PS-1501VI
TECHNICAL DESCRIPTION: Troubleshooting Guide for -UPS
Models PS-1501VI
Problem Probable Cause Solution
