APC 6739380EN/JC user manual Modular UPS with external maintenance bypass, Galaxy UPS

Start-up (cont.)

Galaxy UPS 1

mains 2

rectifier- charger

Q1

mains 1

Q3BP

static switch

Q4S

inverter

Q5N

QF1

battery

load

Galaxy UPS 2	Q3BP
	static switch
	Q4S
mains 2
rectifier-	inverter
charger
Q1	Q5N
mains 1
	QF1
	battery

Modular UPS with external maintenance bypass

Proceed in the following order:

◗check that all lines supplying the load are off or that the load is disconnected;

◗in the maintenance bypass cubicle, open output switch Q5N, then close bypass switch Q3BP;

◗close the upstream switch (on the low-voltage switchboard) supplying power to the Mains 1 inputs on the UPSs;

◗close the Mains 1 input switch Q1 on the UPSs to supply them with power:

Q1 Q4S Q5N

OFF	ON	OFF	OFF
(0)	(I)	(0)	(0)

◗the rectifier/chargers automatically start;

◗red "load not protected" light 2 on the control panels of the UPSs goes on:

! ! + – I O

2

◗close battery circuit breaker QF1 on the UPSs:

QF1

OFF	ON
(0)	(I)

◗close the upstream switches (on the low-voltage switchboard) supplying power to the Mains 2 inputs on the UPSs, then close the Mains 2 input switch Q4S on the UPSs:

Q1 Q4S Q5N

ON	OFF	ON	OFF
(I)	(0)	(I)	(0)

◗close inverter output switch Q5N on the UPSs:

Q1 Q4S Q5N

ON	ON	OFF	ON
(I)	(I)	(0)	(I)
◗ close output switch Q5N in the
maintenance bypass cubicle;
◗ open bypass switch Q3BP in the
maintenance bypass cubicle;

◗press the "inverter on" button 6 on the control panel of a UPS:

!	!	+ –	I	O
			6

◗green "load protected" light 5 flashes for three seconds,

◗the inverter starts and waits for the start of the other units;

◗proceed in the same manner for each unit. When the number of running units is sufficient, the inverter output switches close and the load is supplied by the inverters:

◗red "load not protected" light 2 goes off,

◗green "load protected" light 5 on the control panel goes on.

6739380EN/JC - Page 21