Appendix 1:Rs485 Communication Protocol
EM8 User's Manual
93
Status word
:
(inverter
→ upper computer )
Bit
Meaning
Function description
0
Dc voltage state
1: Normal dc voltage
0: Abnormal dc voltage
1
Motor direction
1: Motor reverse
0: Motor forward
2
Output phase
sequence
1: Negative phase sequence
0: Positive phase sequence
3
System fault
1: Inverter fault
0: Inverter normal
4
Operating state
1: Inverter is running
0: Inverter is stop
5
Waiting to return
after fault
1: Inverter is in the state of waiting to return after fault
2: Inverter is not in the state of waiting to return after fault
6
Reserve
7
DC braking
1: Inverter is in the DC braking
0: Inverter is not in the DC braking
8
Free stop
1: Inverter in the state of free stop
0: Inverter not in the state of free stop
9
Inspection speed
and restart
1: Inverter is in the state of inspection speed and restart
0: Inverter is not in the state of inspection speed and restart
10
Speed up
1: Inverter is in the processing of speed up
0: Inverter is not in the processing of speed up
11
Speed down
1: Inverter is in the processing of speed cut
0: Inverter is not in the processing of speed cut
12
Current limiting
action
1: The limiting current function of inverter is acting
0: The limiting current function of inverter is not acting
13
Voltage limiting
action
1: The voltage limiting function of inverter is acting
0: The voltage limiting function of inverter is not acting
14
JOG running
1: Inverter is in the state of inching running
0: Inverter is not in the state of inching running
15
Wait to restart after
prompt shutdown
1: Inverter is in the state of waiting to restart after prompt shutdown
0: Inverter is not in the state of waiting to restart after prompt shutdown
●
Master command frame: Setting frequency value.
Slave response frame: Actual frequency value data meaning:
Setting frequency value: Set the running frequency of the inverter according to command code from master.
Actual frequency value: Return with the actual running frequency according to command code from master.
Actual value will return corresponding fault code.
Data type: Hexadecimal notation, double byte, upper byte is behind.
Fault code is below
:
Fault
code
Description
Fault
code
Description
0
No fault
1
Over current in the speed up
2
Over current in the deceleration
3
Over current in the steady running
4
Overvoltage in the acceleration
5
Overvoltage in the acceleration
6
Overvoltage in the steady running
7
Overvoltage in the stop
8
Under voltage in the inverter running
9
Inverter overload
10
Adapter motor overload
11
Inverter overheat
12
Earth fault
13
Interference fault
14
Output phase lack
15
IPM fault
16
External device fault
17
Current checking circuit fault
18
Communication fault
2.4.3 Frame footer(checksum)
Data meaning: Computed result of data frame checksum
