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Chapter 6 Operating Instructions
36 Shield M10U user manual
6.3 Procedure for Switching the UPS between Maintenance Bypass and
Normal Mode
6.3.1 Procedure for Switching from Normal Mode to Maintenance Bypass Mode
This procedure can transfer the load from the UPS inverter output to the maintenance bypass supply, but the
precondition is that the UPS is in normal mode before the transfer.
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 risk a short interruption in powering the load.
1. Press the “ ” menu in “operate” on the right side of the LCD.
The UPS Mimic indicator Inverter will green flash and also the Status Indicator will turn red and will be accompanied
by an audible alarm. The load transfers to static bypass, and the inverter standby.
Note
Pressing the mute off button in “operate” menu to cancel the audible alarm but leaves the warning
message displayed until the alarm condition is rectified.
2. Close the manual bypass breaker from OFF to ON position. The load power supply is provided by the manual bypass.
3. Press EPO to make sure the charge current is 0. Open the external battery breaker and internal battery breaker (if
built-in battery cabinet). Then power modules can be maintained.
4. If cabinet maintenance is needed, external maintenance bypass breaker is required. If external maintenance bypass
breaker is available, close external maintenance bypass breaker, open the external input breaker and external
output breaker, then UPS cabinet can be maintained. It’s recommended that external maintenance breaker are
installed as
fig.6-1 :
input
maintenance
output
AC utility To Load
UPS input
UPS output
input
maintenance
output
AC input2
To Load
UPS bypass
input
UPS output
UPS mains
input
bypass
AC input1
(a) Single input (b) split-bypass input
Fig.6- 1: External Maintenance Bypass
Warning
If you need to maintain the module, wait for 10 minutes to let the DC bus capacitor fully discharge before removing
corresponding module.
When the manual bypass switch is on position of ON, some part of the UPS circuit still has hazardous voltage.
Therefore, only qualified person can maintain the UPS.
Note
When the UPS is in maintenance bypass or manual bypass mode, the load is not protected against abnormal mains
supply.
There is no bypass breaker in 6 power modules cabinet.
6.3.2 Procedure for Switching from Maintenance Mode to Normal Mode
1. Close bypass breaker if available. Close manual bypass breaker. Close external output breaker. Close external mains
input breaker. The LCD starts up at this time. The rectifier indicator flashes during the startup of rectifier. The
警告 危 险
警告 危 险
警告 危 险
警告 危 险