FCM 300 / FCD 300 / VLT
®
2800 / DP V1 PROFIBUS
■
Example
This example shows how PPO type 1 is used
for changing the ramp-up time (parameter 207)
to 10 seconds and for commanding a start
and speed reference of 50%.
Frequency converter parameter settings:
P502: serial port
P512: Fieldbus profile (Profidrive profile)
PPO. Parameter-Process Data Object
PCD: Process Data
PCV: Parameter-Characteristics-Value
PCA: Parameter-Characteristics (Bytes 1, 2)
PCA handling below
IND:
Subindex (Byte 3), (Byte 4 is not used)
PVA: Parameter value (Bytes 5 to 8)
CTW: Control word see section
Control word
STW: Status word see section
Status word
MRV: Main reference value
MAV: Main actual value
PCV
PCA - Parameters Characteristics
15 14 13 12
11
10 9 8 7 6 5 4 3 2 1 0
RC
SMP
PNU
RC:
Request /respons Characteristics
(Range 0..15)
SPM:
Toggle-Bit for Spontaneous Messages
PNU:
Parameter #
(Range 1..1999)
PCA part (byte 1-2) The RC part tells what the PCV
part must be used for. The functions available appear
from the table, see section
PCA handling
.
When a parameter is to be changed, choose value 2
or 3, in this example 3 is chosen, because parameter
207 covers a long word (32 bits).
SPM bit:
The function is explained in section
Spontaneous
messages
, in the example the function Spontaneous
Messages is not applied (parameter 917 = OFF),
therefore SPM is set for 0. PNU = Parameter number:
Parameter number is set for: 207 = CF Hex. This
means that the value of the PCA part is 30CF Hex.
IND (bytes 3-4):
Used when reading/changing parameters with
subindex, for example parameter 915. In the example
bytes 3 and 4 are set to 00 Hex.
PVA (bytes 5-8):
The data value of parameter 207 must be changed
to 10.00 seconds. The value transmitted must be
1000, because the conversion index for parameter
207 is -2, this means that the value received by
the frequency converter is divided by 100, making
the frequency converter perceive 1000 as 10.00.
Bytes 5-8 = 1000 = 03E8 Hex.
PCD
CTW according to Profidrive profile:
Control words consisting of 16 bits, the meaning of
the various bits appears from the table, see section
Control word/Status word
. The following bit pattern
sets all necessary start commands:
0000 0100 0111 1111 = 047F Hex.*
0000 0100 0111 1110 = 047E Hex.*
0000 0100 0111 1111 = 047F Hex.
Quickstop: 0000 0100 0110 1111 = 046F Hex.
Stop: 0000 0100 0011 1111 = 043F Hex.
* For restart after power up: Trip OFF 2 and 3.
MRV:
Speed reference, the data format is "Standardized
value". 0 Hex = 0% and 4000 Hex = 100%.
In the example 2000 Hex is used corresponding to
50% of maximum frequency (parameter 202).
The whole PPO therefore gets the following value in Hex:
Byte
Value
PCA
1
30
PCA
2
CF
IND
3
00
IND
4
00
PVA
5
00
PVA
6
00
PVA
7
03
PCV
PVA
8
E8
CTW
9
04
CTW
10
7F
MRV
11
20
PCD
MRV
12
00
The Process data within the PCD part is acting on the
frequency converter immediately, and can be updated
from the master as quickly as possible.
MG.90.A5.02 - VLT is a registered Danfoss trademark
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