INVT Goodrive350 Series Operation Manual page 326

Goodrive350 IP55 High-ingress Protection Series VFD
then 50.12 can be represented as 1394H in the hexadecimal form (5012 in the decimal form).
In the process of multiplying a non-integer by a multiple to obtain an integer, the multiple is
referred to as a fieldbus scale.
The fieldbus scale depends on the number of decimal places in the value specified in "Setting
range" or "Default". If there are n (for example, 1) decimal places in the value, the fieldbus
scale m (then m=10) is the result of 10 to the power of n. Take the following as an example.
Function
Name
code
Wake-up-from-sleep
P01.20
Power-off restart
P01.21
selection
The value specified in "Setting range" or "Default" contains one decimal place, and therefore
the fieldbus scale is 10. If the value received by the upper computer is 50, "Delay of auto fault
reset" of the rectifier is 5.0 (5.0=50÷ 10).
To set "Wake-up-from-sleep delay" to 5.0s through Modbus communication, you need first to
multiply 5.0 by 10 according to the scale to obtain an integer 50, that is, 32H in the
hexadecimal form, and then send the following write command:
address
After receiving the command, the VFD converts 50 into 5.0 based on the fieldbus scale, and
then sets "Wake-up-from-sleep delay" to 5.0s.
For another example, after the upper computer sends the "Wake-up-from-sleep delay"
parameter read command, the master receives the following response from the VFD:
01
VFD
address
The parameter data is 0032H, that is, 50, and therefore 5.0 is obtained based on the fieldbus
scale (50/10=5.0). In this case, the master identifies that "Wake-up-from-sleep delay" is 5.0s.
9.4.6 Error message response
Operation errors may occur in communication-based control. For example, some parameters
can only be read, but a write command is sent. In this case, the VFD returns an error message
response.
Error message responses are sent from the VFD to the master. The following table lists the
0.0–3600.0s (valid only when
delay P01.19 ones place=2)
0: Disable restart
1: Enable restart
01 06
VFD Write
command
03
Read
command
Description
01 14 00 32
Parameter
Parameter
address data
02 00 32
2-byte Parameter
data data
-308-
Communication protocol
Setting range Default Modify
0.00–3600.0 0.0s
0–1 0
49 E7
CRC
39 91
CRC
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