At first, the UPS turns to the bypass mode. Simultaneously, the DC-link is
charged. When the appropriate DC-link voltage level has been reached,
the rectifier turns on. A few seconds from this, the inverter turns on.
It takes approximately one minute for the UPS to achieve the double
conversion (normal) mode.
Once the inverter reaches full voltage, the UPS output contactor closes and
the static switch turns off. Power is now supplied to the critical load in the
double conversion mode.
The normal status indicator is illuminated.
17. If there is an external output switch, close the external output switch.
7.3.2
Starting the UPS in the bypass mode
If the inverter output of the UPS is not available and the critical load needs to be
energized, perform the following procedure:
CAUTION
In the bypass mode, the critical load is not protected from commercial power
interruptions and abnormalities.
1.
Open the UPS front door by lifting the latch from the bottom and turning it
counterclockwise. Swing the door open.
2.
If the UPS contains input and output switches, verify that the input and
output switches are open.
Note: This is only necessary for the 100/120 kVA units with the optional
MBS and input switches installed.
3.
If the UPS contains a bypass input switch (BIS) (100-120 kVA), verify that
the BIS is open.
4.
If the UPS contains an internal maintenance bypass switch (MBS)
(100-120 kVA), verify that the MBS and BIS are open and the neutral
switch is closed.
5.
Close the UPS input feeder circuit breaker.
6.
If the UPS is fed from two input sources, close the UPS bypass input
feeder circuit breaker.
7.
If the UPS contains an input switch, close the input switch.
8.
If the UPS contains a bypass input switch (BIS), close the BIS.
9.
If the UPS contains an output switch, close the output switch.
10. Close the door and secure the latch.
11. Close the external battery breakers.
Observe the UPS control panel display becoming active, indicating logic
power.
12. Verify that no alarms are active. Notices are not to be misinterpreted as
alarms.
Eaton 93E Generation 2 UPS 100-200 kVA
(380/400/415V)
User's and installation guide
©
Eaton Corporation plc 2019. All rights reserved.
Revision: 002
Document ID: P-164000848
89 (118)
