MAXQ3181-RAN+ datasheet(28/84 Pages) MAXIM

28 / 84 page

Low-Power, Active Energy, Polyphase AFE

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Operating Mode Register 1 (OPMODE1) (0x002) (continued)

BIT

NAME

FUNCTION

These bits determine how power is calculated on each of the three phases.

PA = IA x VA

PB = IB x VB

PC = IC x VC

Use this configuration when the load is

connected in a wye arrangement and

neutral is connected to MAXQ3181 ground,

or when the load is connected in a delta

arrangement and isolated voltage and

current sensors are used. This

arrangement measures power in each load

branch rather than power in each source

branch.

PA = IA x VA

PB = IB x (-VC)

PC = IC x VC

Use this configuration when the load is

connected in a four-wire delta

arrangement. In this arrangement, the BC

leg is split and VB-N is expected to be

equal to -VC-N. Voltages are referenced to

neutral.

PA = IA x VA

PB = IB x (-VA - VC)

PC = IC x VC

Use this configuration when the load is

connected in a four-wire wye arrangement,

but only two voltage sensors are

available. When connected in this way,

phase B is assumed to be ground.

1:0

CONCFG

PA = IA x VA

PB = IB x (VA - VC)

PC = IC x VC

Use this configuration when the load is

connected as a three-wire delta and it is

desired to measure the voltage and current

inside the delta legs, but to calculate the

power in each of the source circuits. When

connected this way, source phase B is

considered ground.

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