Kruger Ecowatt K320 Series Operation Manual page 300

Ecowatt Drive K320 series
®
The Read/Write (R/W) characteristics indicate whether a function can be read and written.
For example, "Communication-based control command" can be written, and therefore the
command code 6H is used to control the VFD. The R characteristic indicates that a function
can only be read, and W indicates that a function 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 running command channel" (P00.02) to
the Modbus communication channel. For another example, when modifying "PID setting", 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
identification code 2103H of the VFD).
8 MSBs
01
9.4.6 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, we can multiply 50.12 by 100 to obtain an integer 5012,
and then 50.12 can be represented as 1394H (5012 in the decimal form) in the hexadecimal
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 decimals in the value specified in "Detailed
parameter description" or "Default value". If there are
n
scale m is the -power of 10. Take the following table as an example, m is 10.
th
Function
code
Wake-up-from-sleep
P01.20
Restart after power
P01.21
The value specified in "Setting range" or "Default" contains one decimal, so the fieldbus scale
is 10. If the value received by the upper computer is 50, the value of "Wake-up-from-sleep
delay" of the VFD is 5.0 (5.0=50/10).
To set the "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 transmit the following write command:
Meaning 8 LSBs
Kruger 0xa2
Name
0.0–3600.0s
delay when P01.19 is 2)
0: Disable
failure 1: Enable
n
decimals in the value, the fieldbus
Description Setting range Default
(valid
0.00–3600.0
-291-
Communication
Meaning
K320 vector VFD
0.0s
0–1 0
Modify
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