User manual

Chapter 7 Service 49

NXr UPS Module And Parallel System 30kVA ~ 200kVA User Manual

1. Press and hold the INVERTER OFF button on the operator control and display panel for two seconds to manually

turn off the inverters, and the UPS transfers to bypass mode.

2. Close the maintenance bypass, and the UPS transfers to maintenance mode.

3. Open the external a.c UPS output switch and input switch. In split bypass configuration, it is required to open

external a.c both input switches.

4. Press the EPO switch, ensure that the battery current is 2A. Open the BCB or disconnect the batteries.

5. Remove the fixing screws on both sides of the front panel of the bypass module, and pull the module out of the

cabinet. Wait for 10 minutes before servicing the bypass module.

6. After servicing the module, push the module (at least 10s after another) into the cabinet, and tighten the screws on

both sides.

7. Close the external a.c UPS output switch and input switch in turn. In split bypass configuration, it is required to

close both external a.c input switches.

Two minutes later, the bypass indicator on the operator control and display panel turns on, indicating the UPS is

operating in bypass mode.

8. Open the maintenance switch, press and hold the INVERTER ON button on the operator control and display panel

for two seconds to manually turn on the inverters, and the UPS transfers to normal mode.

7.2 Replacement Procedures Of Air Filter

As shown in Figure 7-1 and Figure 7-2, the UPS provides air filters on the back of the front door. Each air filter is fixed

by a fixing bar on both sides. The air filter replacement procedures are as follows:

1. Open the front door of the UPS to reveal the air filters on the back of the door.

2. Remove the fixing bar on either side of the air filter, and loosen the fixing screws of the fixing bar on the other side,

with no need to remove this fixing bar.

3. Remove the air filter, and insert a clean one.

4. Re-install the removed fixing bar in the original place.

5. Tighten the fixing screws of the fixing bar on the other side.

Fixing screw

Fixing bar

Air filter

Figure 7-1 Replacing air filter of 30kVA ~ 160kVA UPS