Installation and Operation Manual
page 7
MAN332%1.pm5
2.4 User configurable Settings
You can configure the operating parameters of your UPS to meet your application or geographical
requirements. For the PTM280VA and PTM420VA models, use the DIP switches on the rear panel. For
the PTM650VA and PTM1KVA models, use the OptiSafe software package.
Two of the adjustable parameters are low and high voltage transfer points. A transfer point is the pre-
determined voltage at which the UPS transfers to battery power.
In a few locations, mains voltage may fluctuate widely, and the UPS may transfer to battery operation too
often. As a result, the battery may not be at full capacity if there is a complete power failure. If this is
the case, you may adjust the low and high voltage transfer points so that your battery capacity is not
unnecessarily drained.
The adjustable parameters for all models are:
•
Low Voltage Transfer Point:
lowers the transfer point by 10V.
•
High Voltage Transfer Point:
raises the transfer point by 10V.
•
Low Battery Warning Time:
increases from two minutes to five minutes the low battery warning
before shutdown. This adjustment is useful if your UPS is protecting a computer system that requires
extra time to shut down.
•
Delay Audible Alarm in Backup Mode:
disables the audible alarm during a power failure until the
battery power is low. This adjustment is useful in areas in which the alarm may be annoying because
of frequent short power interruptions.
DIP Switch Settings (PTM280VA-420VA):
Function
Switch Up
Switch Down
Low Transfer Point
10V lower
default
High Transfer Point
10V higher
default
Low Battery Alarm
5 minutes
2 minutes
Delay Audible Alarm enabled
disabled
2.5 Communication Port and Pin Assignments
The communication port on the back of the UPS allows connection to a host computer. Using the OptiSafe
UPS monitoring and control package, important operating information from a PC-Power UPS can be
viewed on a computer screen. OptiSafe also provides automatic system shutdown. Using OptiSafe, the
following are some of the parameters that can be monitored:
Reading
Description
Input Voltage
The actual input voltage to the UPS when ac mains is present.
Output Voltage
The actual output voltage of the UPS.
AC Frequency
The actual frequency of the UPS.
Battery Voltage
The dc voltage of the UPS.
Change Battery
The battery is dead and needs to be replaced.
Percent Load
The percentage of UPS VA capacity being used.
Temperature
The actual temperature inside the UPS (650VA-1KVA)
