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54 Chapter 7 “1+N” System
HIPULSE U UPS Single Module And “1+N” (Expandable) 160/200/300/400kVA User Manual
7.3.1 Start-Up Procedure (Into Normal Mode)
This procedure must be followed when turning on the UPS from a fully powered down condition, that is, where the
load is not being initially supplied at all or where supplied by the maintenance bypass switch. It is assumed that the
installation is complete, the system has been commissioned by authorized personnel and the external power isolators
are closed.
Refer to 5.2 Start-Up Procedure (Into Normal Mode).
7.3.2 Maintenance Bypass Procedure (And UPS Shut Down)
Warning
The internal maintenance bypass must not be used when the UPS system is comprised of more than two UPS modules in
parallel.
Refer to 5.6 Maintenance Bypass Procedure (And UPS Shut Down).
7.3.3 Switching OFF And Isolating One UPS While The Other Remains In Service
1. In sequence, open the UPS output switch Q5, input switch Q1, and bypass switch Q2.
2. Open the BCB inside the battery cabinet.
To completely isolate the UPS, open the AC power supply circuit breaker (both circuit breakers if separate supplies
are provided for the rectifier and the bypass supply) and the output circuit breaker on the power distribution
switchboard.
If individual UPS output isolation circuit breaker (and its auxiliary contacts) are not installed on the power distribution
switchboard, remember that voltage supplied by the others UPS which remains in service will still be present on the
output terminals of the shutdown UPS.
Warning
If individual UPS output isolation circuit breaker are not installed on the power distribution switchboard, remember that voltage
supplied by the others UPS which remains in service will still be present on the output terminals of the shutdown UPS.
Warning: Wait five minutes for the internal d.c bus bar capacitors to discharge.
7.3.4 Insertion Procedure (Of One Module In A Parallel System)
This procedure is indicated to re-integrate a UPS module that has been previously isolated from other modules of a
group of paralleled UPS modules. It is assumed that the installation is complete, the system has been commissioned
by authorized personnel and the external power isolators are closed.
1. Open the UPS door to gain access to the power switches.
2. Open (or confirm disabled) maintenance bypass switch Q3.
3. Close the bypass switch Q2, output switch Q5, and any external output isolation switches (where used). The LCD
display becomes active.
4. Close the input switch Q1.
The rectifier LED flashes on the operator control and display panel during the startup of rectifier and becomes steady
green once the rectifier reaches normal operation state after about 15 seconds.
5. Close the external BCB. This breaker is located inside the battery cabinet (if used) or is otherwise adjacent to the
battery racks.
6. Following battery availability being detected by the UPS, the red battery LED extinguishes moments after when the
battery charger starts operation.
7. Press and hold the INVERTER ON button for two seconds.
The inverter will start up and the inverter LED flashes while it synchronizes to the load voltage frequency. After the
inverter is ready, the UPS connects to the load, the inverter LED becomes steady green and the load LED turns
green.