Startup Procedure (Parallel Redundancy); Shutdown Procedure (Parallel Redundancy) - AEG 80 / 120 kVA Operating Instructions Manual

5-5 Startup Procedures (Parallel Redundancy)
Before starting up the UPS system, be sure to check the following items first.

All circuit breakers are cut off and switched to OFF, as well as the breaker or
fuse of the external battery cabinet.

Confirm if the locking latch is located at "".

Confirm if there is no voltage potential between NEUTRAL and Ground.

Confirm if the input power source matches the rated voltage, frequency, phase
and battery of the UPS that you have installed.
For parallel operation, you must set the ID code of each UPS as "01", "02", "03"
and "04" by configuring the control panel. Refer to Page 7-18.
Start up procedure:
If the conditions mentioned above are satisfied, follow the steps below to start
up.
1. Connect two UPSs by using the parallel communication cable. Ensure the
connector is fastened to the DB9 port. The connection of up to 4 UPS must be in a
loop. Connect UPS 1 to UPS 2, UPS 2 to UPS 3, UPS 3 to UPS 4 and UPS 4
again to UPS 1. The UPS with the lowest and the highest ID (recommended is
UPS 1 and 4) have to terminate the communication bus. Please set the small
switches at the back of these ups near the parallel connector to "on".
2. Switch the breaker of external battery cabinet to ON.
3. Switch on bypass input protection circuit breaker "Q2" of each UPS. The LCD
screen will show "ON AUTO BYPASS".
4. Switch on "Q1" of each UPS.
5. Press the "I" button for 3 seconds until you hear a "beep" and then release the
button. The inverter will be activated and synchronize with bypass source.
6. Repeat Step 5 to start up another UPS. When the inverter voltage of both UPSs
activates normally, both UPSs will transfer to normal mode at the same time.
7. Check the output voltage deviation per each phase of each UPS (must be less than
5V). If it is normal, switch on "Q4" of each UPS.
5-6 Shutdown Procedures (Parallel Redundancy)
If you need to shut down one of the paralleled UPSs:
1. Press the "O" button on the UPS that you want to shut down for 3 seconds until you
hear a "beep" and then release the button. The LCD screen will show
"SHUTDOWN UPS?", then select "YES" and press "
- If the other UPS can take over the total loads, then the turn-off one will shutdown
inverter. The LCD screen shows "LOAD NOT POWERED" for the turn-off one.
The working UPS shows "ONLINE MODE".
- If the total loads are greater than one UPS can take over, then both UPSs will
shut down the inverter and transfer to bypass mode. Both UPSs show "ON
AUTO BYPASS".
5-4
" to confirm.