Powerware 9170 User Manual page 97

On-Generator:
by a generator. Closure of this contact causes the UPS to change the
following parameters to preset values that are designed to optimize
performance during periods of generator instability:
Phase Lock Window and Frequency Slew Rate. These parameters
increase the rate at which the UPS tracks the input line, which causes
fewer recognized line faults during generator instability.
Frequency Glitch Count. This parameter increases the number of bad
frequency cycles before the unit transfers to battery power. This
allows the UPS to operate smoothly during generator instability
without transferring to battery.
Maximum Delta and Line Delta. These parameters widen the
acceptable input voltage range, allowing the UPS to ignore any
transient voltage regulation problems a generator may experience
during unstable periods.
These parameters are also available to trained service personnel through
the Service Menu.
See Figure 15 on page 26 and Figure 21 on page 31 to make the
connection for all dedicated input signals.
+
Powerware 9170 UPS User's Guide
®
An external signal that the input power is being supplied
Rev B www.powerware.com
S
Communication
89