GE MM300 Manual page 52
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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FORMAT CODES
2–44
Code
Type
4
5
6
FC126
16 bits
0
1
FC128
16 bits
0
1
2
3
4
5
FC129
16 bits
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
FC130
16 bits
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
FC131
16 bits
1
2
4
8
16
32
64
FC133
16 bits
0
1
CHAPTER 2: RS485 INTERFACE (MODBUS RTU)
Definition
RTD #4
RTD #5
RTD #6
Disabled / Enabled Selection
Disabled
Enabled
Command Status
Manual
Auto
Manual Inhibit
Auto/ Manual
Hardwired Auto
None
Quick Status
Alarm
Trip
Self Test Fault
Auto
Contactor A
Contactor B
Contact Output 3
Drive Available
LED Flash
Running
Stopped
Tripped
Alarm
Comms OK
Auto
Manual
USER1
USER2
USER3
50%
80%
100%
Comm Fail Mode
Serial
Serial & Ethernet
Serial & FieldBus
Ethernet
FieldBus
Ethernet & Fieldbus
All
CAUSE OF WAVEFORM/DATA LOG TRIGGER
None
Command
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
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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