Danfoss FC 300 Profibus Manual page 54

FC 300 Profibus
Example
This example shows how to use PPO type 1 to change the ramp-up time (parameter 3-41 Ramp 1 ramp up
time) to 10 seconds and to command a start and speed reference of 50%.
Frequency converter parameter settings:
Par. 8-50 Coasting select: Bus
Par. 8-10 Control word profile: PROFIdrive profile
PCV
PCA – Parameter Characteristics
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 PCA handling.
When a parameter is to be changed, choose value 2 or 3. In this example 3 is chosen, because par. 3-41
Ramp 1 ramp up time covers a long word (32 bits).
IND (bytes 3-4):
Used when reading/changing parameters with sub-index, for example par. 9-15 PCD write configuration.
In the example bytes 3 and 4 are set to 00 Hex.
PVA (bytes 5-8):
The data value of par. 3-41 Ramp 1 ramp up time must be changed to 10.00 seconds. The value transmitted
must be 1000, because the conversion index for par. 3-41 Ramp 1 ramp up timeis –2. This means that the
value received by the frequency converter is divided by 100, such that the frequency converter perceives
1000 as 10.00. Bytes 5-8 = 1000 = 03E8 Hex. See Object and Data types supported by FC 300.
PCD
Control word (CTW) according to PROFIdrive profile:
Control words consist of 16 bits. The meaning of the each bit is explained in the section Control word and
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.
Quick stop: 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 (par. 4-13 Motor
speed high limit (rpm)).
The whole PPO therefore has the following values in
Hex:
54
How to Access FC 300 Parameters
MG.33.C2.02 - VLT is a registered Danfoss trademark
Byte
PCA 1
PCA 2
IND 3
IND 4
PCV
PVA 5
PVA 6
PVA 7
PVA 8
CTW 9
CTW 10
PCD
MRV 11
MVR 12
Value
30
CF
00
00
00
00
03
E8
04
7F
20
00