ULP Systems

[jedzruiz1985]

Hi Xperts,

Just want to confirm, if multiple ACBs (MTZ) have their own IFM stacked to an IFE server (daisy chained via stacking connectors),  do we still need to provide separate 24VDC on each ULP module of the breakers even though the IFM is providing 24V already from the IFE Server thru the IFMs?

Thanks in advance,

Jiedan

[Guillaume_Evrard · Accepted solution]

Hello @jedzruiz1985 

For MTZ I would say that the 24VDC connector is feeding the communication but also the Micrologic. You are right that stacking connector is feeding the IFM. For Masterpact NT/NW you do not need to have separated PSU for BCM ULP but for MTZ yes it is mandatory as per ULP manual:

Kind Regards

[Romain_Polette · Accepted solution]

Hello @jedzruiz1985 , 

Please refer to the Micrologic X User Guide to better know how this trip unit is power supplied:

According to this section of the ULP Guide:

The ULP port module:

• Supplies power to the MicroLogic X control unit.
• Has an integrated ULP line termination.
• Enables the connection to external ULP modules, like the IO module or the IFE interface.

For MasterPacT MTZ drawout circuit breakers with optional EIFE interface, the ULP port module:

• Supplies power to the EIFE interface.
• Connects the EIFE interface to the other IMU modules (for example, IO module).

There is a dedicated ULP Power Supply section in the ULP guide:

• ULP port module for MasterPacT MTZ circuit breakers => Must be connected to a 24 Vdc power supply and cannot be powered through its ULP port.
• IFE Ethernet switchboard server => Must be connected to a 24 Vdc power supply and cannot be powered through its ULP port.
• IFM Modbus-SL interface for one circuit breaker => Must be connected to a 24 Vdc power supply and cannot be powered through its ULP port.

Tl;dr:

• MTZ ULP port must be supplied by 24DC
• IFE must be powered by 24DC
• You can stack up to 11 IFM to an IFE

 Regards,