MGE UPS Systems 225KVA (1), NOTE, in kVA, UPS output, 1.6.2Bypass AC Source, maximum permissible current, Electrical parameters for bypass AC source (480 V)

Installation and User Manual

1.6.2Bypass AC Source

The parameters given in Table 1-2 and 1-2A can be used to determine the required rating of the upstream protec- tive circuit breaker on bypass AC input.

NOTE	If the installation includes a transformer on the bypass AC input, allow for the
	inrush current caused by magnetization of the transformer windings.

Table 1-2: Electrical Parameters for Bypass AC Source.

Electrical parameters for bypass AC source (480 V)

rated UPS	current bypass AC source (1)
output	rated current In for unit:	for 25%	for 50%
in kVA		overload	overload (3)
100	120	150	180
130	156	205	234
150	180	236	270
180	217	283	325
200	241	316	362
225	271	320	407

(1)The bypass AC source currents have been determined for a rated phase-to-phase voltage of 480 V, a load power factor of 0.9 and for full rated load as well as overloads of 25% or 50%. When choosing the circuit breaker rating, use the "rated current" column and check that the circuit breaker tripping curves are compatible with the data in the overload columns. See table and chart below.

Table 1-2A:

	UPS output		maximum permissible current
	in kVA
100			50 In for 20 ms
130			38 In for 20 ms
	150		33 In for 20 ms
180			27 In for 20 ms
	200		25 In for 20 ms
225			22 In for 20 ms
Figure 1-3: Fuse Curve Chart.
			t(s)
		104
		103
		102
		101
		1
		10-1
		10-2
		10-3
		10-4
		10		2	103	104	I(A)

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