GE MM300 Manual page 38
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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MODBUS MEMORY MAP
Modbus
Hex
Description
40889
0378
Aux U/V Alarm Delay
40890
0379
Aux UV Trip
40891
037A
Aux UV Trip Delay
40892
037B
Reserved
40893
037C
Reserved
40894
037D
Reserved
PHASE OVERVOLTAGE (REQUIRED=IO_B)
40895
037E
Overvoltage Alarm Level
40896
037F
Overvoltage Alarm Delay
40897
0380
Overvoltage Trip Level
40898
0381
Overvoltage Trip Delay
40899
0382
Reserved
40900
0383
Reserved
40901
0384
Reserved
40902
0385
Reserved
PHASE REVERSAL (REQUIRED=IO_B)
40903
0386
Voltage Phase Reversal
40904
0387
Reserved
40905
0388
Reserved
40906
0389
Reserved
40907
038A
Reserved
VT FUSE FAIL (REQUIRED=IO_B)
40908
038B
VT Fuse Fail
40909
038C
Reserved
40910
038D
Reserved
40911
038E
Reserved
MAINTENANCE
40912
038F
Drive Greasing Interval
40913
0390
Contactor Inspection Interval
40914
0391
Max Motor Stopped Time
40915
0392
Reserved
40916
0393
Reserved
START INHIBIT
40917
0394
Start Inhibit Margin
40918
0395
Reserved
40919
0396
Starts/Hour Limit
40920
0397
Time Between Starts
40921
0398
Reserved
CHANGE MODE
40922
0399
Change Mode on Comm Alarm 0
40923
039A
Change Mode when running
40924
039B
Reserved
40925
039C
Reserved
RESTART BLOCK
40926
039D
Restart Block Time
40927
039E
Reserved
2–30
Min
Max
Step
1
60
1
60
91
1
1
60
1
---
---
---
---
---
---
---
---
---
101
121
1
1
60
1
101
121
1
1
60
1
---
---
---
---
---
---
---
---
---
---
---
---
0
2
1
---
---
---
---
---
---
---
---
---
---
---
---
0
2
1
---
---
---
---
---
---
---
---
---
100
50100
100
100
65000
100
10
10010
10
---
---
---
---
---
---
0
11
1
---
---
---
1
6
1
1
3601
1
---
---
---
1
1
0
1
1
---
---
---
---
---
---
1
50001
1
---
---
---
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 2: RS485 INTERFACE (MODBUS RTU)
Units
Format Default
s
F1
5
*
eUnitNCV F1
91
s
F1
5
---
---
---
---
---
---
---
---
---
*
%MNV
F1
121
s
F1
30
*
%MNV
F1
121
s
F1
30
---
---
---
---
---
---
---
---
---
---
---
---
---
FC140
1
---
---
---
---
---
---
---
---
---
---
---
---
---
FC140
0
---
---
---
---
---
---
---
---
---
*
hrs
F1
50100
*
ops
F1
65000
*
hrs
F1
10010
---
---
---
---
---
---
*
%
F1
11
---
---
---
*
F1
6
*
s
F1
3601
---
---
---
---
FC126
0
---
FC126
0
---
---
---
---
---
---
*
s
F1
50001
---
---
---
Size in
Words
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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Table of Contents
Need help?
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