GE MM300 Manual page 31
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
40240
00EF
DST End Weekday
TIME BROADCAST
40241
00F0
Time (broadcast)
40243
00F2
Date (broadcast)
40244
00F3
Reserved
▼
▼
▼
40261
0104
Reserved
VIRTUAL INPUT
40262
0105
Virtual Input 32-1 (Bit Field)
40264
0107
Reserved
40265
0108
Reserved
CURRENT SENSING
40266
0109
Phase CT Type
40267
010A
CT Primary
40268
010B
Ground CT Type
40269
010C
High Speed CT Primary
40270
010D
CT Primary Turns
40271
010E
Reserved
▼
▼
▼
40275
0112
Reserved
VOLTAGE SENSING
40276
0113
3 Phase Voltage Connection
40277
0114
Aux VT Connection
40278
0115
Aux VT Primary
40279
0116
Aux VT Secondary
40280
0117
Reserved
40281
0118
Reserved
40282
0119
Reserved
40283
011A
Reserved
MOTOR DATA SETUP
40284
011B
Supply Frequency
40285
011C
Motor Name
40295
0126
Starter Type
40296
0127
Reserved
40297
0128
Reserved
40298
0129
Motor FLA
40299
012A
High Speed FLA
40300
012B
Motor Nameplate Voltage
40301
012C
Change Over Current
40302
012D
Reserved
40303
012E
Transfer Time
40304
012F
High Speed Start Block
40305
0130
Ramp Up Time
40306
0131
Ramp Down Time
40307
0132
Pre-contactor Time
40308
0133
Motor Rating
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Min
Max
Step
0
7
1
0
0X173B3B63 0
0
0X0C1F082E 0
---
---
---
▼
▼
▼
---
---
---
0
0xFFFFFFFF 1
---
---
---
---
---
---
0
3
1
5
1000
1
0
2
1
5
1000
1
1
10
1
---
---
---
▼
▼
▼
---
---
---
0
1
1
0
8
1
110
690
1
110
300
1
---
---
---
---
---
---
---
---
---
---
---
---
0
1
1
0
10
0
0
7
1
---
---
---
---
---
---
5
10001
1
5
10001
1
100
690
1
10
51
1
---
---
---
0
125
1
0
1
1
0
125
1
0
125
1
0
60
1
3
11001
1
MODBUS MEMORY MAP
Units
Format Default
---
FC170
0
F19
0
F18
0
---
---
---
▼
▼
▼
---
---
---
FC167
0
---
---
---
---
---
---
---
FC105
0
A
F1
5
---
FC104
2
A
F1
5
F1
1
---
---
---
▼
▼
▼
---
---
---
---
FC106
0
---
FC176
0
V
F1
415
V
F1
110
---
---
---
---
---
---
---
---
---
---
---
---
Hz
FC107
0
---
F22
3
---
FC139
0
---
---
---
---
---
---
*
A
F2
10001
*
A
F2
10001
V
F1
690
*
x FLA
F2
15
---
---
---
s
F1
1
---
FC126
1
s
F1
1
s
F1
1
s
F1
0
*
kW
F2
11001
Size in
Words
1
2
2
1
▼
1
2
1
1
1
1
1
1
1
1
▼
1
1
1
1
1
1
1
1
1
1
10
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2–23
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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