Startup Steps; Shutdown Steps; Emergency Shutdown - Alpha ESS PWG2-50K User Manual

20 Chapter V Commissioning and Operation

Startup steps

5.2.2
These startup steps are applicable to the circumstance that the Bi-directional Hybrid Storage Inverter system is in
outage state and can be started. Operation steps are as follows:
1) Close output switch of battery cabinet and connect power supply to DC port of the device.
2) Close DC breaker Q1. Green indicator light flickers in green. After about 10s, the red indicator light is always on in
red. At this moment, LCD will indicate the warning information such as "under-voltage of power grid" and
"abnormal power grid frequency". If step 2 and step 3 are conducted before the red light is always on, the
flickering in red will not appear.
3) Set monitoring parameter to control operation mode. See setting information in 6.2.
4) After step 3 is conducted, return to "main wiring diagram" on LCD and start DC/AC modules.
5) According to the current operation mode setting and DC input, the host will automatically operate and display.

Shutdown steps

5.2.3
During normal operation of Bi-directional Hybrid Storage Inverter, the following steps can be conducted if
shutdown is required.
1) On LCD, return to "main wiring diagram", and click AC/DC module to "shut down".
2) Normally, main monitoring indicator light flickers in green for about 30s.
3) Disconnect DC breaker Q1.
4) Disconnect AC breaker Q3.
As for above operation process, it has been shut down after step 2 is conducted. The power components stop
operating in system, and BUS bar and auxiliary power supply in system still exist for a long time. Therefore, relevant
control system is still in standby state. In this state, device setting and maintenance are not allowed. After step 4 is
conducted, the Bi-directional Hybrid Storage Inverter is in a shutdown state, and the internal connector bars are
electrically neutral in system. After the internal capacitance in modules fully discharges, relevant maintenance and
setting can be conducted.

Emergency shutdown

5.2.4
When the Bi-directional Hybrid Storage Inverter system is abnormal, press the emergency shutdown button "EPO"
on the cabinet door and then conduct steps 3~5 in 5.2.3.
To prevent personal injury, please use a multi-meter to measure the voltage at input terminal if case maintenance or

opening is conducted. After ensuring that there is no mains supply, relevant operation can be conducted!
After about 15 minutes, the upper cover plate can be opened after DC BUS bar capacitance fully discharges (refer to

Warning