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Once the loads are turned ON, a typical screen will appear as:
Fault Checking:
Once the UPS is turned "ON", the system logic will normally indicate any faults
affecting the operation of the equipment. Generally these would be:
1) If at any time the INPUT STATUS is flashing a message, regardless of whether the AC LINE
breaker of the UPS is on or off, there is a problem with the voltage coming from the utility. If
the flashing message is BAD ROTATION, you have incorrectly connected the utility to the
INPUT VOLTAGE terminal block of the UPS. To obtain the correct phasing, you must swap
two of the three phase wires (X, Y, and Z) at the block of the UPS or at the service breaker
feeding the UPS. Refer to the Installation section of this manual to perform this change
(note: you will have to completely power down the UPS and turn off all UPS breakers and
the AC service feed breaker to perform this task).
2) If after turning the front rotary switch to the ON UPS position, the BATTERY DISCHARGING
light does not go off, check the LCD display for reasons. If the bottom line flashes AC LINE
PROBLEM, the INPUT STATUS line will flash reason for the AC line problem. If another
message is displayed, refer to the Troubleshooting section of this manual for further
information.
3) Any other problems encountered may either be caused by skipping a step, or a malfunction
in the UPS. Please check your procedure before calling the factory for assistance.
4.2 TRANSFERING BETWEEN "ON UPS" AND "ON BYPASS" MODES OF OPERATION
Your UPS is equipped with a bypass feature that allows you to manually connect your critical load
directly to the utility instead of powering your load from the UPS. This feature allows maintenance to be
performed on the UPS without interrupting your load. You can switch to the ON BYPASS position, then
turn off the UPS via its AC line and battery breakers. When maintenance on the UPS has been
completed, the breakers on the UPS are turned back on, and the load is switched back to the UPS
without interruption. These transfers are make-before-break, which means there is absolutely no
interruption of power to the load. When changing from ON UPS to ON BYPASS or vice versa, a
"Transfer Request" must be made by pressing the TRANSFER REQUEST button on the front panel.
The UPS must know when a transfer is to take place in order to assure that a seamless transfer is
performed. The transfer switch has an interlock that disables the switch from being turned between the
ON UPS and ON BYPASS positions when such a transfer cannot be performed seamlessly. However,
do not rely entirely on this interlock from stopping an unapproved transfer. Read the directions on the
LCD transfer request screen to determine when the switch may be turned.
When the TRANSFER REQUEST button is pressed, the LCD screen will inform you of the type of
transfer from UPS to BYPASS or BYPASS to UPS that is being attempted and whether or not such a
transfer can be performed. If the transfer cannot be performed, the display will indicate the reason. For
example, if the rotary switch is in the ON UPS position and the TRANSFER REQUEST button is
0 1 / 1 1 / 9 9 M E S T A E L E C T R O N I C S 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 | 2 0 8 | 2 0 9 | 2 0 9 | 2 7 4
A M P S =
1 7 | 1 8 | 1 6 | 1 6 | 1 5 | 1 6 | + 0 . 0
% R A T E D =
5 5 | 5 7 | 5 2 | 5 8 | 5 5 | 5 8 |
C H A R G E
_
F R E Q =
6 0 . 0 0 | 6 0 . 0 0 1 0 0 %
