Chapter 5 Operating Instructions 59
NX UPS Single Module And Parallel System 250kVA ~ 800kVA User Manual
5.8 EPO Procedures
The EPO switch is designed to switch off the UPS in emergency conditions (that is, fire, flood, and so on). The
system will turn off the rectifier, inverter and stop powering the load immediately (including the inverter and bypass),
and the battery stops charging or discharging.
After EPO, if the input mains is present, the UPS’s control circuit will remain active; however, the output will be turned
off. To remove all power from the UPS, open the external power switch of the UPS.
5.9 UPS Reset Procedures
After an EPO action or UPS shutdown due to UPS fault, once all appropriate measures have been taken to correct
the problem indicated by the alarm message on the LCD, carry out the following procedures to restore the UPS to
normal operation.
1. Press the FAULT CLEAR key to let the system exit the EPO state.
2. When the rectifier begins to operate normally (rectifier indicator in solid green), press the INVERTER ON key on
the operator control and display panel.
Note
1. The rectifier will start and the bypass will begin to power the load. The rectifier indicator flashes while the rectifier is starting up.
When the rectifier enters normal operation (about 30 seconds later), the rectifier indicator turns solid green.
2. The rectifier will start automatically when the overtemperature fault disappears five minutes after the disappearance of
overtemperature signal.
After the EPO switch is pressed, if the mains input is cut off, the UPS will shut down completely. When the mains
input returns, the UPS will start up on bypass. There will be power at the output terminals of the UPS.
5.10 Automatic Restart
In the case of a mains failure, the UPS draws power from the battery system to supply the load until the batteries are
depleted. When the UPS reaches its EOD threshold, it will shut down.
The UPS will automatically restart and enable output power:
After the mains power is restored
If Auto Recovery after EOD Enabling is enabled
After the Auto Recovery after EOD Delay Time expires (the default delay is 10min). During the automatic
recovery delay, the UPS will charge its batteries to provide a safety margin for equipment shutdown if input
power fails again
If the Auto Recovery after EOD Enabling feature is disabled, the user may restart the UPS manually by pressing the
FAULT CLEAR key.
Note
During the automatic restart process, manual startup is disabled. Automatic restart must be set by authorized commissioning
engineer of Emerson through background software.
5.11 Selecting Language
The LCD menu and data display is available in two languages: Chinese and English.
Use the following procedures to select the language:
1. On the OutPut menu screen, press the F3 (left) or F4 (right) key to select the Language menu.
2. Press the HELP (enter) key to move the cursor to the data window of the screen.
3. Press the F3 (up) or F4 (down) key to select the desired language.
4. Press the HELP (enter) key to confirm.
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