50 NS3000 UPS 60KVA~120KVA User Manual
Danger
If you need to maintain the power module, wait for 10 minutes to let the DC bus capacitor
fully discharge before removing the cover.
5.2.5 Switching the UPS into Normal Mode from Maintenance Bypass
Mode
These following procedures can transfer the load from the Maintenance Bypass to inverter
output.
1) One by one to turn on the output breaker (Q4), input breaker (Q1), bypass input
breaker (Q2), and then the system starts initializing.
2) After 30S, the static bypass turns on, the bypass indicator LED goes green, and the
load is powered through maintenance bypass and static bypass.
3) Turn on the external battery breaker.
4) Turn off the maintenance bypass breaker and the load is powered through static
bypass.
5) After 30S, the rectifier starts, the rectifier indicator LED goes green, and then inverter
starts.
6) After 60S, the system transfers to Normal mode.
5.3 Battery Maintenance
If the battery is not in use for a long time, it is necessary to test the condition of the battery.
Two methods are provided:
1) Manual Discharging test. Enter the menu Operate
，
as is shown in Figure.5-2 and
touch the icon “Battery maintenance”
，
the system transfers into the Battery
mode for discharging. The system will stop discharging when the battery will have
20% of capacity or in low voltage. Users can stop the discharging by touching the
“Stop Test” icon
.
ESC Mute
Transfer to Bypass
B
I
Figure 5-2 Battery maintenance
2) Auto discharging. The system cans maintenance the battery automatically when the
setting is done. The setting procedures are as follows.
(a) Enable battery auto discharge. Enter the “CONFIGURE” page of the menu
Setting, tick the “Battery Auto Discharge” and confirm (This needs to be done by
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