UTY 618
6
RESTRICTED
November 1995
CAUTION
When the unit is in battery maintenance mode (Parameter 63 set to “1”), there is still
live voltage inside the UPS.
Battery maintenance mode (Parameter 63 set to “1”) should be used during battery
maintenance only. Do not use battery maintenance mode for any other type of UPS
service or maintenance.
102-1.
Verify the stability of the AC line. If there are irregularities with the input AC line,
BEST recommends that you do not use battery maintenance mode at this time.
!
Press the [
VLINE
] key on the front of the unit. Watch to see if the input voltage is
stable.
!
You can also check the UPS system log to see if the unit has frequently switched
to battery power (inverter) recently. See the
UNITY
/I User Manual for
instructions on viewing the system log. Look for the system event code “in”
(inverter).
102-2.
Access parameter mode and enter the user password (377) as follows:
NOTE:
When the unit is in parameter mode, each of the front panel keys has a
specific function. The label inside the front door of the unit explains the
parameter mode key functions. The label also shows a “Programming
Template” with alternate key names that correspond to the parameter
mode key functions.
a. Simultaneously hold down the [
CANCEL
] and [
RUNTIME
] keys for two seconds.
Release them when the display reads
P-00
.
b. Press [
CANCEL
]. The display should read
0
.
c. Use the [
%
LOAD
] key or the [
VOUT
] key to change the display reading to
377
.
NOTE:
Use the [
%
LOAD
] key to increase the value. Use the [
VOUT
] key to
decrease the value. If you hold down either key, the display begins to
scroll more quickly.
d. Press [
RUNTIME
]. The display should read
I
. If it does not, repeat steps “c” and
“d.”
e. Press [
CANCEL
]. The display should read
P-00
.
