VGD-33 single unit upgrade to parallel system • • All single units must work properly Installation of the external cables and power cords: all should be connected firmly.

VGD-40K3-DTT-0010N single unit PCB setting • PCB P430 ： CN26 pin 1-2 CN28 pin 1-2 • PCB P386 ： CN17 ， CN27 ， CN37 ： short • PCB P428 ： SW2-1 ： short SW2-2 ： short CN22 ， CN23 ： pin 2-3

• • • VGD-40K3-DTT-0011N parallel system PCB setting • PCB P267: Master UPS ： SW1-1 ： OFF SW1-2 ： ON Slave UPS ： SW1-1 ： ON SW1-2 ： OFF PCB P430 ： CN26 ： pin 2-3 CN28 ： pin 2-3 PCB P386 ： CN17 ， CN27 ， CN37 ： open PCB P428 ： SW2-1 ： open SW2-2 ： open CN22 ， CN23 ： pin 1-2

VGD-40K3-DTT-0010N parallel system PCB placement 115-P390-011 112-P263-011 111-P349-051 Bridge diode Resister Resister Terminal block 110-P430-010 112-P428-021

VGD-40K3-DTT-0011N parallel system PCB placement 115-P390-011 112-P263-011 111-P349-051 110-P267-010 Bridge diode Resister Resister Terminal block 110-P430-010 112-P428-021

VGD-40K3-DTT-0010N single unit PCB placement photo

VGD-40K3-DTT-0011N parallel system PCB placement photo Bridge rectifier and Golden aluminum shelled resistors Terminals

Parallel system cable connect

VGD-40K3-DTT-0010N single unit SCH.

VGD-40K3-DTT-0011N parallel system SCH-1.

VGD-40K3-DTT-0011N single unit SCH-2

Caution • All cables should be connected correctly; tighten any loose connection.

• There should be no missing or loose parts found on the PC board.

If any of the above faulty circumstances occur, please test again after completion of troubleshooting.

CAN BUS setting • • • • • • • Disconnect P430 CN7 connector first Turn on MST input power Enter Paramt Equipm -> Communic . Address: 001 menu for settings Metro Address : 001 Turn on SLV input power Enter Paramt -> Communic Equipm. Address: 002 menu for settings Metro Address : 002 CAN Address : 001 CAN Address : 002

Power-on without Main Power Supply • • • Turn on MST and SLV EPO switches, panel ON.ON. Wait about 1 minute and the system will move to INV.

Confirm MST panel is indicating Parallel_MST_OK and SLV panel is indicating Parallel_SLV_OK Confirm MST and SLV panel system is working in the INVERTER mode Confirm MST panel and SLV panel settings via Paramt-> Test Prm PDS=0 POV=0 PNU=2 PBP=2 PIV=2 MST panel OFF, ON, and confirm MST and SLV are all wired to BYPASS Turn off EPO switch Turn off MST and SLV input power Disconnect the external CN4 25P connector of SLV Turn on MST and SLV input power Confirm MST panel is indicating Parallel_MST_OK and SLV panel is indicating Parallel.Bus

Turn on EPO switch, panel ON.ON

Turn off MST and SLV input power Re-connect CN4 25P connector and disconnect the external CN1 and CN2 connectors of SLV Turn on MST and SLV input power Turn on EPO switch, panel ON.ON

Confirm MST panel is indicating Parallel_MST_OK and SLV panel is indicating Parallel.Bus

Turn off MST and SLV input power

Power-on with Main Power Supply •

Confirm the phase is locked

• Re-connect two 430 CN7 connectors • Two sets of UPS P428: SW2-1 OFF, SW2-2 ON • Turn on MST and SLV input power • Turn on EPO switch • Wait about 1 minute, two UPS INVERTERs will start operation • Confirm MST and SLV panels are working properly and do not display any and voltage error message.

MST • Turn on MST and SLV battery switches • Turn off input switches simultaneously panel is indicating Parallel_MST and SLV panel is indicating Parallel_SLV • Confirm the two sets have the same output waveform, phase

Power-on with Main Power Supply • • • • • • • • • • • • • • • •

EPO, output switch and maintenance bypass switch are confirmed

MST EPO switch OFF, confirm MST and SLV outputs are all closed MST EPO switch ON, wait for MST and SLV to turn to INVERTER SLV EPO switch OFF , confirm MST and SLV outputs are all closed SLV EPO switch ON , wait for MST and SLV to turn to INVERTER Turn off MST output switch, and confirm MST is switched to SINGLE and SLV is switched to MST Turn on MST output switch, panel ON.ON, and wait for the original MST to be switched from SINGLE to MST Turn off SLV output switch, and confirm SLV is switched to SINGLE Turn on SLV output switch, panel ON.ON, and wait for the original SLV to be switched from SINGLE to SLV MST panel OFF, ON, and confirm MST and SLV system is wired to bypass Turn on MST maintenance bypass switch, and confirm MST and SLV panels are indicating Parallel Sys., Manten. Byp Turn off MST maintenance bypass switch Turn on SLV maintenance bypass switch, and confirm MST and SLV panels are indicating Parallel Sys., Manten. Byp Turn off SLV maintenance bypass switch Wait for the INVERTER of MST and SLV system to be reset If all the above functions work properly, the parallel units may be operated properly .