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NS300 Series User Manual
Chapter 5 Operating Procedures
This chapter describes UPS operation instructions in detail.
All functional keys and LED display involved in operation instructions please refer to chapter 5.
During operation, the buzzer alarm may occur at any time. Select “mute” on LCD to muffle the audible
alarm.
Warning-Hazardous mains voltage and/or battery voltage present(s) behind the
protective cover
1. The components that can only be accessed by opening the protective cover with tools cannot be
operated by user.
2. Only qualified service personnel are authorized to remove such covers.
5.1 Power Switches
As shown in fig 5-1, open the front door of UPS, the power switch is visible, which includes: input
switch, output switch and maintenance bypass switch (with anti-misoperation stop plate)
Fig. 5-1 10KVA~30KVA Mains switch location drawing
5.2 UPS Start-up
The UPS system only has a maintenance bypass isolating switch, and all the other transfers are
processed automatically by internal control logics.
5.2.1 Normal Mode Start
This procedure must be followed when turning on the UPS from a fully powered down condition. The
operating procedures are as follows:
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NS3000 Series User Manual rev.01
Warning
This procedure results in mains voltage being applied to the UPS output terminals. If any load
equipment is connected to the UPS output terminals please check with the load user that it is safe to
apply power. If the load is not ready to receive power then ensure that the output switch of external
distribution cabinet is opened.
Warning
Please confirm that UPS output rotating switch point to UPS, with anti-misoperation stop plate for
rotating switch is fixed well.
1. Close UPS bypass input switch and input switch in turns
The LCD starts up at this time. The Rectifier indicator flashes during the startup of rectifier. The
rectifier enters normal operation state, and after about 30s, the rectifier indicator goes steady green. After
initialization, the bypass static switch closes. The UPS Mimic LEDs will indicate as shown in table 5-1:
Table 5-1 Indicator status
LED
Status
Rectifier indicator
Green
Battery indicator
Red
Bypass indicator
Green
Inverter indicator
Off
Load indicator
Green
Status indicator
Green
Warning
The bypass input air switch must be opened firstly and then the input air switch is opened, otherwise,
the rectifier can not be started and the system can not control the power.
The inverter starts up at this time, the inverter indicator flashes. After the rectifier enters normal
operation state, UPS power supply will transfer from bypass to inverter, then the bypass indicator turns
off, and load indicator lights. The status of indicators is shown in table 5-2
Table 5-2 Indicator Status
LED
Status
Rectifier indicator
Green
Battery indicator
Red
Bypass indicator
Off
Inverter indicator
Green
Load indicator
Green
Status indicator
Green
If your UPS is with build-in battery type, please close internal battery DC switch. Battery indicator
turns off, a few minutes later, the battery will be charged by UPS which will enter normal mode operation.
The indicator status is shown in table 5-3.
If your UPS is without build-in battery type, please close external battery DC switch.
Warning
Please confirm battery connection right before closing external battery switch.