Emerson 15-90KVA Manuel D’Utilisation

To start the UPS from a fully powered-down condition:
1. Open the external power switch.
2. Open the UPS door.
3. Connect the power supply cables.
4. Ensure the correct phase rotation.
5. Confirm that the address DIP switch of the main Liebert FlexPower assemblies are different from 

each other, and they are within 1 to 6. If they are the same, adjust them to create different Liebert 

FlexPower assembly addresses.

6. Close the external input circuit breaker and connect input power.

The LCD activates. The rectifier indicator flashes while the rectifier is starting. The rectifier 

enters normal operation state, and after about 30 seconds, the rectifier indicator stops blinking 

and is illuminated in a steady green. After initialization, the bypass static switch turns on. The 

mimic LEDs appear as shown Table 30.

7. Ensure that the Liebert FlexPower assembly ready switches are latched (in Down position).
8. Close the external output circuit breaker.
9. Press the INVERTER ON button for 2 seconds. The inverter indicator flashes while the inverter 

is starting. After the inverter is ready, the UPS transfers from bypass to inverter, the bypass 

indicator turns Off, and the inverter indicator turns On. The UPS is in Normal Mode. The mimic 

LEDs will appear as shown below.

Flex Power 

Assembly 

Address Top to Bottom

Swtich Number Left to Right

1

2

3

4

5

6

Down

Up

Up

Down

Down

5

Up

Down

Up

Down

Down

4

Down

Down

Up

Down

Down

3

Up

Up

Down

Down

Down

2

Down

Up

Down

Down

Down

1

Up

Down

Down

Down

Down

NOTE
For standardization, if the quantity of modules in system is less than 6, for example 45kVA 

Rectifier Indicator

Green

Battery Indicator

Red

Bypass Indicator

Green

Inverter Indicator

Off

Load Indicator

Green

Status Indicator

Amber