Chapter 7 Maintenance and Troubleshooting
JT550 Series Inverter Manua
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1.2.3 CRC Check Methods
CRC(Cyclical Redundancy Check) utilizes RTU frame format, and its messages include the error
check domain based on CRC method. CRC domain is able to detect the content of messages. CRC domain
has two bytes, including 16 bits of binary value. It is added to the messages after CRC is calculated by
transmission device. Receiving device will recalculate CRC in the messages and compare it with the value
received in CRC domain. If they are not equal, it indicates an error occurs during the transmission.
1.3 Communication Data Address Definition
Function Code Parameters Read/Write (Some function codes are non-modifiable and subject to the
manufacturers or for the purpose of monitoring.
1.3.1 Labeling Rules of Function Code Parameters Address
Register address is divided into higher bytes and lower bytes depending on the inverter’s function
codes sequence. Higher bytes represents the group sequence of function parameters, and lower bytes
represents the sequence of function parameters inside a group. Both of them need converted into
hexadecimal.
Higher Bytes: F0~FF(Group F)
、
70
（
Group H
）
Lower Bytes: 00~FF
Function codes group number and their communication access addresses:
Communication Access Address for F0-FE: 0xF000~0xFEFF; Communication Access Address for
H0: 0x7000~0x70FF.
For example, if the function code is F3.12, then its access address is 0xF30C.
Note: Group FF: No reading or modification of parameters.
Group H: Parameters can be read only. No modification of parameters.
Some parameters is not modifiable during the operation of inverter; Some can not be modified under
any circumstances; Please note the range and units of parameters and their description when modifying them.
In addition, frequent use of EEPROM will reduce the life span of it. Therefore, you may change the
values of some function codes in RAM instead of saving them at EEPROM. It is possible to do so by
changing the high bit F of the function code’s address to 0. For example, if the function code F3-12 is not
to be saved at EEPROM, the address can be written as 030C.
1.3.2 Address Description of Other Function Parameters
1). Halt/Operating
Parameter
Address
Parameter Description
Parameter
Address
Parameter Description
1000H
*Communication Setting Value
（
Decimal
）
-10000~10000
1010H
PID Setting
1001H
Operating Frequency
1011H
PID Feedback
1002H
Bus Voltage
1012H
PLC Procedures
1003H
Output Voltage
1013H
PULSE Input Pulse Frequency, Unit:
0.01kHz
1004H
Output Current
1014H
Feedback Speed, Unit: 0.1Hz
1005H
Output Power
1015H
Remaining Operating Time
1006H
Output Torque
1016H
AI1 Voltage Before Calibration
1007H
Operating Speed
1017H
AI2 Voltage Before Calibration
1008H
DI Input Sign
1018H
AI3 Voltage Before Calibration
1009H
DO Output Sign
1019H
Linear Speed
100AH
AI1 Voltage
101AH
Current Power-On Voltage
100BH
AI2 Voltage
101BH
Current Operating Time
