Conversion; Examples - Danfoss VLT DriveMotor FCP 106 Programming Manual

RS-485 Installation and Set...
Data types
3
4
5
6
3 3
7
9
Table 3.8 Data Types

3.4.12 Conversion

The various attributes of each parameter are displayed in
the chapter Parameter Lists in the Programming Guide.
Parameter values are transferred as whole numbers only.
Conversion factors are therefore used to transfer decimals.
Parameter 4-12 Motor Speed Low Limit [Hz] has a conversion
factor of 0.1.
To preset the minimum frequency to 10 Hz, transfer the
value 100. A conversion factor of 0.1 means that the value
transferred is multiplied by 0.1. The value 100 is thus
perceived as 10.0.
Conversion index
74
2
1
0
-1
-2
-3
-4
-5
Table 3.9 Conversion
3.4.13 Process Words (PCD)
The block of process words is divided into 2 blocks of 16
bits, which always occur in the defined sequence.
PCD 1
Control telegram (master⇒follower control
word)
Control telegram (follower⇒master) status
word
Table 3.10 Process Words (PCD)
22
®
VLT DriveMotor FCP 106 and FCM 106 Programming Guide
Description
Integer 16
Integer 32
Unsigned 8
Unsigned 16
Unsigned 32
Text string
Conversion factor
3600
100
10
1
0.1
0.01
0.001
0.0001
0.00001
PCD 2
Reference-value
Present output
frequency
MG03N102 - Rev. 2013-12-02

3.5 Examples

3.5.1 Writing a Parameter Value
Change parameter 4-14 Motor Speed High Limit [Hz] to 100
Hz.
Write the data in EEPROM.
PKE=E19E hex - Write single word in parameter 4-14 Motor
Speed High Limit [Hz]:
IND=0000 hex
PWEHIGH=0000 hex
PWELOW=03E8 hex
Data value 1000, corresponding to 100 Hz, see
chapter 3.4.12 Conversion.
The telegram looks like this:
E19E H 0000 H 0000
PKE IND PWE
Illustration 3.11 Telegram
NOTICE
Parameter 4-14 Motor Speed High Limit [Hz] is a single
word, and the parameter command for write in EEPROM
is "E". Parameter 4-14 is 19E in hexadecimal.
The response from the follower to the master is:
119E H 0000 H 0000
IND PWE
PKE
Illustration 3.12 Response from Master
3.5.2 Reading a Parameter Value
Read the value in parameter 3-41 Ramp 1 Ramp Up Time
PKE=1155 hex - Read parameter value in
parameter 3-41 Ramp 1 Ramp Up Time
IND=0000 hex
PWE =0000 hex
HIGH
PWE =0000 hex
LOW
H 03E8 H
PWE
high low
H 03E8 H
PWE
low
high