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Masterpact (NT and NW) and larger frame size Powerpact (P and R Frame) and Compact NS Circuit Breakers
|Trip Unit||Trip Function||Type|
|2.0A (IEC Only)||LSO||Standard|
Communication applications using Micrologic trip units in 2 wire configurations
Older version of the breaker communication module (BCM) are not capable of 2 wire communication. The replacement, BCM ULP version, is capable of 2 wire communication
The Micrologic trip unit must have a breaker communications module (BCM) with gray terminals. If the device has green terminals on the BCM, it is not capable of the 2 wire communications configuration, 4 wire only. Below the figures show the two units.
There are three possible wiring configuration for a BCM ULP, 4 Wire, 2 Wire, and 2 Wire + ULP. See the figure below for the wiring diagram for each configuration. As you see from the diagrams, the 4 wire and 2 wire configurations have the same setting on the trip unit, 4 Wire. The BCM can auto detect the correct setting. The 2 Wire + ULP setting provides two terminals for 2-wire Modbus communication and 2 terminals for ULP protocol. ULP is a protocol common to many Schneider devices including Micrologic trip units and FDM121 display is diagram.
The 2 Wire + ULP is the default setting on the BCM ULP. The configuration can be set using a Micrologic RSU, see the link below. The Micrologic A trip unit must be set using this program. P and H type trip units can be configured from the front panel using the procedure below. See the instruction bulletins for more information.
Powerpact P, R, and Masterpact NW, NT Micrologic™ 5.0P and 6.0P Trip Units, see 48049-137-05
Powerpact P, R, and Masterpact NW, NT Micrologic™ 5.0H and 6.0H Trip Units, see 48049-330-03
Link to Micrologic RSU program.
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