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5 bypass current sharing inductors, Bypass current sharing inductors, Table 26 – Emerson Liebert NX 50 and 60 Hz User Manual

Page 118: Battery cabinet

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Options—For Assembly Inside the UPS Cabinet

106

Figure 72 Battery Start Option for UPS with external battery

9.1.5

Bypass Current Sharing Inductors

Applicable in paralleled UPS configurations to ensure that the (passive) static bypass switches, when

activated, share the load current. The inductors provide droop type current compensation for the oth-

erwise inherent current dispersion due to SCR and cable impedance differences.

Three bypass current sharing inductors are assembled within each UPS cabinet without requirement

of additional footprint. The resulting degree of unbalance is typically less than 20% of the rated sys-

tem current depending on the external cable configuration. Cable lengths from the Bypass supply to

each UPS module and from the UPS module output to the paralleling point should be kept as identi-

cal as possible.

NOTE
Battery contactor opens after Inverter shutdown at end of battery discharge. Battery Start

settings disable the end of discharge trip command to external battery circuit breaker.

Table 26

Bypass current sharing inductors-dimensions, values

UPS

Dimensions

WxLxH, mm (in)

Inductor

Value (uH)

30/ 40 kVA

70x100x140

(2.8x3.9x5.5)

122

60/80 kVA

140x100x200

(5.5x3.9x7.9)

65

100/120kVA

210x100x250

(8.3x3.9x9.8)

40

140/160kVA

160x190x240

(6.3x7.5x9.4)

26

200kVA

160x190x240

(6.3x7.5x9.4)

22

Black-Start Resistor

Black-Start LED

AL6-M

Auxiliary Contact

Main Contact

Contactor

Control Coil

Battery Black-Start

Board

Contactor

Soft-In

Soft-Out

X2

-1

X2

-2

X1

-1

X1

-2

P-Bus

N-Line

N

NO

P

C

J15-2

J15-1

Batt-P

J12-33

+

J12-34

X7

2 3

4

Monitor Board

-U2

Detection Board

-M4

UPS

P-Bus

N-Line

Manual Press-Button

(AB6M)

Batt-N

+

Battery

Cabinet

Batt-N

-

Batt-P

+

OT6-4 LM35

Blue

Green

Red

1

2

3

GN

D
IN
P

12

TMP-2

Temperature

Transport

OU

T

P1

2

GN

D

3
2

4

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