GE MM300 Manual page 51
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 2: RS485 INTERFACE (MODBUS RTU)
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Code
Type
1
FC104
16 bits
0
1
2
FC105
16 bits
0
1
2
3
FC106
16 bits
0
1
FC107
16 bits
0
1
FC109
16 bits
0
1
2
3
4
5
6
7
8
9
FC111
16 bits
0
1
FC112
16 bits
0
1
FC116
16 bits
0
1
FC121
16 bits
0
1
2
3
4
FC122
16 bits
0
1
2
3
Definition
ON / YES
Ground CT Type
None
Residual
CBCT 2000:1
Differential CT Type
None
1 A Secondary
5 A Secondary
Direct Connect
Voltage Transformer Connection Type
Wye
Delta
Supply Frequency
60
50
Flex Logic Status
OK
Unknown Token
Too Many Latches
Too Many Timers
Too Many + OneShots
Too Many - OneShots
Too Many Duel OneShots
Stack Overflow
Stack Underflow
Program Too Long
Trip Relays
Trip
Alarm
Communication Status
Error
OK
Switch Type
Open
Closed
RTD Application
None
Stator
Bearing
Ambient
Other
RTD Voting Selection
OFF
RTD #1
RTD #2
RTD #3
FORMAT CODES
2–43
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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