Smart Tower UPS 10-30KVA User Manual
Chapter 5 Operating Procedurce
23
5.3.4 Procedure of Switch the UPS into a Maintenance Bypass from Normal Mode
In normal operation, this operation instruction will switch the load from inverted input to maintenance
bypass.
Caution
Before this operation, read messages on LCD to be sure that bypass supply is regular and
s
ynchronize to the inverte so as not to risk a short interruption in powering the load.
1. Switch UPS from normal mode to bypass mode according to 5.3.2.
The inverter indicator and status indicator go off, the buzzer alarms. The load will be transferred to
static bypass, and the inverter close.
2. Remove anti-misoperation stop plate for rotary circuit breaker, then the rotary circuit breaker is
switched to the maintenance bypass side in order that the load power is supplied by the maintenance
bypass, and the mains switch Q1, the bypass switch Q2, the output switch Q4 and the internal and
external battery switches are disconnected.
Warning
If required to maintain the modules, the cabinet need to be opened for internal maitenance after 10
minutes waiting for the automatically discharging of capacitor in the internal DC bus.
5.3.5 Procedure of Switch the UPS to Normal from a Maintenance Bypass Mode
This procedure can transfer the load to normal mains mode when the UPS is running under the
maintenance bypass mode.
1
．
Close the bypass switch Q2 ,and switch the rotary switch to “UPS output” after 10 seconds.
The indicator light of the bypass become green and the power is supplied for the load by the
bypass.
2
．
Close the mains input circuit breaker Q1
The power is supplied for the load by the bypass. At the same time, the rectifier begins to operate,
the indicator light of the rectifier become green after 30 seconds, and the power is automatically
supplied with the inverter after 2 minutes.
3. Close internal and external battery switches. If the indicator light of the battery does not work, the
voltage of the LCD display battery is inspected.
4. Replace the anti-misoperation stop plate for rotary switch.
5.4 Procedure of Completely Power the UPS down
When need power down the UPS completely, follow the procedures in section 5.3.4 to transfer the
UPS from normal mode to maintenance bypass mode.
If you need to isolate the UPS from the AC power supply, you should off the external input switch.
5.5 EPO Procedure
The EPO button on the UPS operates displaying and control panel that is designed to switch off the
UPS in emergency conditions (e.g., fire, flood, etc.).To achieve it, just press the EPO button, and the
system will turn off the rectifier, inverter and terminate the load power supply immediately (including the
inverter and bypass output), and the batteries stop charging or discharging.
If there is power input, the UPS control circuit would remain active; however, the output would be
turned off. To completely isolate the UPS, you need to disconnect the external mains input supply of the
UPS.