GE MM300 Manual page 123
Motor management system/low voltage motor protection and control
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Also See for MM300:
- Instruction manual (198 pages) ,
- Quick start manual (77 pages) ,
- Installation recommendations (21 pages)
Table of Contents
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CHAPTER 4: FIELDBUS INTERFACE
Profibus or Device et
Optional fieldbus protocols
Switched power supply
allows AC or DC control
voltage
Optional TCP/IP
Ethernet
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
RS485 communications
and thermistor input
I/O card includes:
Core-balance ground CT input
two contactor outputs (form-A)
•
six programmable inputs
•
•
single-phase VT input (60 to 300 V AC)
Terminal designations are as shown in the table below:
Terminal
V-
L
C
H
V+
7.
After the connections are complete, the network will look something like this:
Three-phase and
Expansion module
residual ground CT
to base unit with a single connector
inputs
Function
Common
Signal Low
Shield
Signal High
Power Supply
DEVICENET PROTOCOL
Optional three-phase
voltage module
RTD Module
with three RTD inputs
Expansion module
allows additional digital
inputs/outputs, RTDs, or
voltage inputs
Color
Black
Blue
Non insulated
White
Red
853740A2.CDR
4–45
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Do you have a question about the MM300 and is the answer not in the manual?
Questions and answers
we have a problem with device MM300. it says that the device is invalid through the software and does not read the device. the communication is through RS 485. is it possible to give us an advice or send us some reccomendations or instructions?
For a GE MM300 device that is not recognized by software and communicates via RS485, follow these troubleshooting steps:
1. Ensure correct RS485 wiring:
- Use two-wire RS485 in a daisy chain configuration.
- Install a 120 Ohm resistor in series with a 1 nF ceramic capacitor at each end of the link.
- Use shielded wire and ground the shield at only one location.
2. Check device addressing and termination:
- Confirm proper device address and ensure no address conflicts.
- Verify that termination networks are correctly installed at both ends.
3. Confirm half-duplex communication:
- Ensure that the system supports half-duplex communication and not sending and receiving data simultaneously.
4. If using USB for setup (e.g., USB-to-RS485 converter) and the device is not recognized:
- Repeat the connection procedure 2–3 times.
- If still not recognized, uninstall the USB driver from Device Manager under modems.
- Disconnect the USB cable, wait at least 10 seconds, then reconnect.
- When prompted by the Hardware Wizard, select "No, not this time," then "Install the software automatically," and press "Continue Anyway."
- Finish the installation and check if the USB device appears in the setup software.
These steps help ensure proper hardware connection and correct software recognition of the MM300 device.
This answer is automatically generated