INVT Goodrive350-19 Series Operation Manual page 406

Goodrive350-19 Series VFD for Crane
For example, "Communication-based control command" can be written, and therefore the command
code 06H is used to control the VFD. The R characteristic indicates that a function parameter can
only be read, and W indicates that a function parameter can only be written.
Note: Some parameters in the preceding table are valid only after they are enabled. Take the
running and stop operations as examples, you need to set "Running command channel"
(P00.01) to "Communication", and set "Communication mode of running commands" (P00.02)
to Modbus. For another example, when modifying "PID reference", you need to set "PID
reference source" (P09.00) to Modbus communication.
The following table describes the encoding rules of device codes (corresponding to the VFD
identification code 2103H).
8 MSBs
22
10.4.5 Fieldbus scale
In practical applications, communication data is represented in the hexadecimal form, but
hexadecimal values cannot represent decimals. For example, 50.12 Hz cannot be represented in the
hexadecimal form. In such cases, multiply 50.12 by 100 to obtain an integer 5012, and 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 table as an example.
Function
Name
code
Wake-up-from-sleep
P01.20
delay
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:
Meaning 8 LSBs
Crane
0x00
industry
0.0–3600.0s (valid only when
P01.19 ones place=2)
0: Disable restart
1: Enable restart
Goodrive350-19 VFD for crane
Description
-394-
Communication protocol
Meaning
Setting
Default Modify
range
0.00–3600.0 0.0s
0–1 0
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