Chapter 3—Installation and Wiring42 Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.comUSB PortThe USB port on the Base Control Module is a standardMicro USB port. It supports the Modbus protocol and istypically used to interface the Power Xpert inControlSoftware Tool to the C445 Motor Management Relay forconfiguration and monitoring. Since this port supports theModbus slave protocol, it will respond to Modbus commandsfrom any Modbus master connected to this port. Allparameters shown in the C445 Modbus Register Table inAppendix E can be accessed by the Software Tool or anyModbus master.When a Micro B cable is connected, this port acts as a serialModbus port with the following interface parameters:19200 Baud, 8 bits/byte, Even Parity and 1 Stop BitThe LED labeled “USB” above the USB port flashes greenwhen the port is connected and data is being transferred.Test/Reset ButtonThere is a small indented push button on the front of theBase Control Module that supports reset and Test Tripfunctions as follows:Factory Reset – This is a power up service. With the C445powered down, press the button and hold it while applyingpower. Continue to hold down the button for 5 seconds afterapplying power.Test Trip – This is a runtime service. With the C445 alreadypowered, press and hold the button for at least 5 secondsand a Test Trip Fault will occur.Fault Reset – This is a runtime service. With the C445 alreadypowered, press and hold the button for at least 0.5 secondsto perform a fault reset.RJ12 PortsThe two RJ12 ports on the bottom of the Base ControlModule are used to connect the Measurement Module andthe optional User Interface module, to create a completeC445 Motor Management Relay system. RJ12 cables ofvarying lengths are available for this purpose. Refer toTable 3 on Page 4 for part numbers and cable lengths.When a Measurement Module and an optional UserInterface module are initially connected to the Base ControlModule, they are automatically accepted. Either RJ12 portcan be used for either module. After the C445 system isinitially connected, a fault will be generated by the BaseControl Module if the Measurement Module is moved to theother RJ12 port on the Base Control Module while thesystem is powered. This applies to the User Interface aswell. A fault reset must be sent to clear this fault. If themodules are connected to different RJ12 ports while thesystem is powered down, no faults will be generated uponpower up.If one or both of the Measurement Module and UserInterface are removed while the system is powered up ordown and not plugged back into the Base Control Module, acommunication loss fault will be generated. If the removedmodule is meant to be removed from the systempermanently, a “repair” service should be sent from thePower Xpert inControl Software Tool. Following this, thedevice will soft reset itself and the fault will be cleared,resulting in a new system configuration without the removedmodule. This really only applies to removing a User Interfacemodule since a Measurement Module is required.Connecting a Measurement Module or User Interfacemodule with a different part number to the Base ControlModule while the system is powered will also result in afault. A fault reset will clear the fault. If the desire is to usethe new module, a “repair” service should be sent with theSoftware Tool. If the new module was connected bymistake, connect the correct module with the old partnumber and send a fault reset. A soft reset always follows a“repair” service.Connecting a Measurement Module or User Interfacemodule with a different part number to the Base ControlModule while the system is powered down will result in afault when the system is re-powered. A “repair” serviceshould be sent if the desire is to use the module with thenew part number. If the new module was connected bymistake, connect the module with the old part number andissue a fault reset.A fault reset can be issued from the following sources:1. By holding the small button on the front of the BaseControl Module down for at least 0.5 seconds whilethe device is powered.2. From the Power Xpert inControl Software Tool.3. From any Modbus master to the USB port or theRS-485 port.4. From a Modbus TCP master to the optionalEthernet card.5. From an EtherNet/IP master to the optionalEthernet card.Measurement Module1. PTC InputTo utilize this optional feature, a Measurement Modulemust first be purchased with this feature included fromthe factory. This is not a field upgradable option.Wire a compatible thermal detector, up to a 6 MARK Atype PTC thermal detector across the T1 an T2 terminalsof the 2-point connector on the Measurement Module.There are no settings of any kind to make in the C445.To make this PTC input a Trip or Warning, enable it assuch using the Power Xpert inControl Software Toolunder the Protections category.
