Owner manual

32 Chapter 3 Operating Instructions

3.3 Procedure for Switching between Operation Modes

3.3.1 Procedure for Switching the UPS into Battery mode from Normal Mode

Open input switch to cut off the mains, UPS enters the battery mode. If UPS should be switched to

normal mode, wait for a few seconds before closing input switch, so as to supply the mains again. 10s

later, the rectifier will start up automatically to supply power to the inverter.

3.3.2 Procedure for Switching the UPS into Bypass mode from Normal Mode

Select “Tran Byp” on the LCD, or press “off” buttons of each power module in turn.

警告

危险

Note

In bypass mode, the load is directly fed by the mains power instead of the pure AC power from the

inverter.

3.3.3 Procedure for Switching the UPS into Normal from Bypass Mode

Select exit bypass mode on the LCD.

3.3.4 Procedure for Switching the UPS into a Maintenance Bypass from Normal Mode

In normal operation, this operation instruction will switch the load from inverter input to maintenance

bypass.

警告

危险

Caution

Before making this operation, read messages on display to be sure that bypass supply is regular and

the inverter is synchronous with it, so as not to have a risk of a short interruption in powering the load.

1. Press “Tran Byp” on the LCD, or press “off” on each power module in turns.

If press ”Tran Byp” on the LCD, the inverter indicator will flash green and the buzzer will alarm.

If press “off” on each power module in turns, the inverter indicator will go off and the buzzer will

alarm.

The load will be transferred to static bypass, and the inverter is closed.

2. Close maintenance bypass switch Q2, the load power will be supplied by maintenance bypass, and

then open the main input breaker Q1, output switch Q3 and battery switch.

警告

危险

Warning

If you need to maintain the module, wait for 10 minutes to let the DC bus capacitor fully discharge

before removing corresponding module.

3.3.5 Procedure for Switching the UPS into Normal from a Maintenance Bypass Mode

This procedure can transfer the load to normal main mode when the UPS is operating under the

maintenance bypass mode.

1. Close output switch Q3 and main switch Q1.

The bypass indicator goes green and the load power will be supplied by bypass and maintenance

bypass.

2. Open maintenance bypass switch Q2.