GE MM300 Manual page 21
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)
Modbus
Hex
Description
30337
0150
Current Unbalance
30338
0151
Ig
VOLTAGE METERING
30340
0153
Va1 Angle
30341
0154
Vb1 Angle
30342
0155
Vc1 Angle
30343
0156
Ia Angle
30344
0157
Ib Angle
30345
0158
Ic Angle
30346
0159
Reserved
▼
▼
▼
30357
0164
Reserved
30358
0165
Vab
30359
0166
Vbc
30360
0167
Vca
30361
0168
Average Line Voltage
30362
0169
Van
30363
016A
Vbn
30364
016B
Vcn
30365
016C
Average Phase Voltage
30366
016D
Freq
30367
016E
Reserved
▼
▼
▼
30375
0176
Reserved
30376
0177
VAux
30377
0178
Voltage Unbalance
30378
0179
IO Voltage
30379
017A
Reserved
▼
▼
▼
30383
017E
Reserved
POWER METERING
30384
017F
Power Factor
30385
0180
Real Power
30387
0182
Reserved
30388
0183
Reserved
30389
0184
Reactive Power
2
30391
0186
Apparent Power
30392
0187
MWh Consumption
30394
0189
Mvarh Consumption
30396
018B
Mvarh Generation
2
30398
018D
Apparent Power
30400
018F
Reserved
▼
▼
▼
30425
01A8
Reserved
TEMPERATURE METERING
30426
01A9
Internal Temp
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Min
Max
Step
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
0
359
1
0
359
1
0
359
1
---
---
---
▼
▼
▼
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
0
20000
1
---
---
---
---
---
---
▼
▼
▼
---
---
---
---
---
---
0
100
1
0
0xFFFF
1
---
---
---
▼
▼
▼
---
---
---
-99
100
1
-50000
50000
1
---
---
---
---
---
---
-50000
50000
1
0
50000
1
---
---
---
---
---
---
0
999999999
1
0
4294967295 1
▼
▼
▼
-40
125
1
MODBUS MEMORY MAP
Units
Format Default
%Ub
F1
N/A
A
F10
N/A
°
F1
N/A
°
F1
N/A
°
F1
N/A
°
F1
0
°
F1
0
°
F1
0
---
---
---
▼
▼
▼
V
F1
N/A
V
F1
N/A
V
F1
N/A
V
F1
N/A
V
F1
N/A
V
F1
N/A
V
F1
N/A
V
F1
0
Hz
F3
N/A
---
---
---
▼
▼
▼
---
---
---
V
F1
N/A
%Ub
F1
0
V
F1
0
---
---
---
▼
▼
▼
---
---
---
1
F21
N/A
kW
F13
N/A
---
---
---
---
---
---
kvar
F13
N/A
kVA
F2
N/A
MWh
F17
N/A
Mvarh
F17
N/A
Mvarh
F17
0
kVA
F10
N/A
▼
▼
▼
°C
F4
0
Size in
Words
1
2
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
2
1
1
2
1
2
2
2
2
1
▼
1
1
2–13
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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