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IDLE position for any period of time). Make sure the breakers are not in the tripped position. If they are,
turn the breakers all the way off, then turn them on. The breakers and transfer switch may be turned on
in any order. Also, the loads may be either turned on or off when turning on the UPS -- the UPS doesn't
care; however, the manufacturer of your load equipment may require a power-up sequence with your
equipment. After turning on the UPS, an LCD display, similar to that shown in step 6 below, will appear.
If this is the first time you are turning on the UPS following installation, you should follow the following
turn-on procedure to become familiar with the operation of the UPS and to check your wiring and loads:
1. With the UPS’ AC breaker off and all loads turned off, turn on the AC utility feed to the UPS,
turn on the battery breaker(s) on the UPS and on all external battery cabinets. Turn the
Transfer Switch clockwise one position to the OFF IDLE position. After a few seconds, the
UPS system logic will turn on all three lights on the front panel, and the audible alarm will
beep twice, then go silent. The three lights will stay lit for about 10 seconds. At the end of
this 10 seconds, the audible alarm will emit a steady tone for about 3 seconds and the lights
will start flashing in unison. During this startup, the LCD screen will indicate a "Warning"
exists. The only warning that should exist at this time is one indicating that the AC breaker is
open. If any other display than the Warning Alarm display appears, you probably have a
problem, or the AC breaker is not off.
2. Press the Alarm Reset button on the front panel keypad to acknowledge that you've seen
the warning. The main status display (display #1) should appear similar to the example that
follows:
The message “** WARNING **” will be flashing at the top of the display in place of the
“MESTA ELECTRONICS“ that is normally displayed. This informs you that a warning still
exists, which in this case is caused by the AC breaker being open. INPUT should display
OFF indicating the AC line is not being utilized. INPUT STATUS will be blank unless there is
a problem with the AC utility (such as low voltage because an external breaker feeding the
AC to the UPS is open or a phase rotation problem exists). The UPS is able to display the
AC line voltage and frequency even though the AC line breaker on the UPS is off because
the UPS monitors the AC line both before and after this breaker. OUTPUT STATUS will
display OFF (flashing) indicating that the UPS is not producing any output to the load. At the
bottom of the display, the message TRANSFER SWITCH IS IN OFF IDLE POSITION will be
flashing, indicating the reason why the UPS is not operating correctly.
3. If the AC line status is blank, indicating no problems with the AC utility, proceed to turn on
the input AC breaker. This will cause the warning to disappear, but the UPS still won’t run,
because the transfer switch is still in the OFF IDLE position. All three lights are still flashing.
The screen should now appear similar to the example that follows:
0 1 / 1 1 / 9 9 * * W A R N I N G * * 1 6 : 5 2 : 1 1
_
I N P U T
_ O F F
O U T P U T
_ O F F
B A T T E R Y
S T A T U S =
V O L T S =
2 0 5 | 2 0 4 | 2 0 4 | 0 | 0 | 0 | 2 5 5
A M P S =
0 | 0 | 0 | 0 | 0 | 0 |
+
0 . 3
% R A T E D =
0 | 0 | 0 | 0 | 0 | 0 |
C H A R G E
_
F R E Q =
6 0 . 0 0 | - - . - - 9 9 %
T R A N S F E R S W I T C H I S I N O F F I D L E P O S I T I O N
