Danfoss VLT 2800 Operating Instructions

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 conve rter 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: Subind ex (Byte 3), ( Byte 4 is no t 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 109876543210
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 c hanged, 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 Spontane ous
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 = C F 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 a nd 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 m ea ns 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 He x.
PCD
CTW according to Profidrive profile:
Control words consisting of 16 bi
ts, the meaning of
the various bits appears from the table, see section
Control word/Status word. The following bit p attern
sets all necessary start com
mands:
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: Tr
ip 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 use d 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 PC D part is acting on the
frequency converter imme diately, and can be updated
from the master as quickly as possible.
MG.90.A5.02 - VLT is a registered Danfoss t rademark
28

Danfoss VLT 2800 Specifications

General

Brand	Danfoss
Model	VLT 2800
Category	DC Drives
Language	English