MGE UPS Systems user manual Isolate all UPSs, Galaxy PW External bypass

User’s Manual

parallel UPS redundant and for increased output

See figure 22.

■isolate all UPSs

Proceed in the following order (see figure 23):

❏shut down the inverters (press the "inverter OFF" buttons 8 for three sec- onds),

❏close switch Q3BP and open switch Q5N in the external bypass unit,

❏open switches Q1, QF1 and Q5N on the UPS units.

■ start-up

Following servicing, proceed in the follow- ing order (see figure 24):

❏close switches Q5N on the UPS units,

❏close switch in the external bypass unit,

❏open switch Q3BP in the parallel-con- nection unit,

❏close switches Q1 and QF1 on the UPS units,

❏start the inverters (press the "inverter ON" buttons 7 ).

NOTE

We recommend that you call on the after-sales support department to carry out these opera- tions.

Note that for parallel UPSs for increased out- put, the entire installation must be bypassed because it is not possible to isolate just one UPS unit.

				Q3BP
	1	Q1	Q5N	Q5N
			QF1
	2	Q4S
2
		Galaxy 1
	1
	2	Galaxy 2
	1
	2	Galaxy 3
	1
	2	Galaxy 4

Fig. 22

	Galaxy PW
1								2		3	4	5
						external bypass
	Q1	Q4S		Q5N		Q3BP	0	1	0	1	0	1
5	1		1		1			1		1		1
	0	0		0		Q5N	0		0		0
			QF1
6
			0	I
	1		1		1
7	0	0		0

Fig. 23

	Galaxy PW
1								2		3	4	5
						external bypass
	Q1	Q4S		Q5N		Q3BP	0	1	0	1	0	1
5	1		1		1			1		1		1
	0	0		0		Q5N	0		0		0
			QF1
6
			0	I
	1		1		1
7	0	0		0
Fig. 24

Maintenance 29