Danfoss VLT Profinet MCA 120 Operating Instructions Manual page 30

How to Control the Frequenc...
PVA (bytes 5-8)
The data value of 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 3-41 Ramp 1 Ramp
Up Time is 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 chapter 8.6 Object and Data Types
Supported.
6.2.7 PCD
Control word (CTW) according to PROFIdrive profile:
Control words consist of 16 bits. The meaning of each bit
is explained in the section Control word and Status word.
6 6
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.
NOTICE
* For restart after power up: Bit 1 and 2 of the CTW must
be set to 1 and bit 0 toggled from 0 to 1.
6.2.8 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 (3-03 Maximum Reference).
The whole PPO therefore has the following values in Hex:
PCV
PCD
Table 6.6 PPO Values in Hex
28
Byte
PCA 1
PCA 2
IND 3
IND 4
PVA 5
PVA 6
PVA 7
PVA 8
CTW 9
CTW 10
MRV 11
MVR 12
Danfoss A/S © Rev. 2014-02-27 All rights reserved.
Operating Instructions
The process data within the PCD part acts immediately
upon the frequency converter, and can be updated from
the master as quickly as possible. The PCV part is a
"handshake" procedure which means that the frequency
converter has to acknowledge the command, before a new
one can be written.
A positive response to the preceding example may look
like this:
PCV
PCD
Table 6.7 Positive Response
The PCD part responds according to the state and parame-
terization of the frequency converter.
The PCV part responds as
•
•
Value
31
•
55
00
00
00
•
00
03
E8
04
7F
20
00
Byte
PCA 1
PCA 2
IND 3
IND 4
PVA 5
PVA 6
PVA 7
PVA 8
STW 9
STW 10
MAV 11
MAR 12
PCA: As the request telegram, but here the RC
part is taken from Table 6.4. In this example, RC is
2 Hex, which is a confirmation that a parameter
value of the type long word (32 bit) has been
transferred. IND is not used in this example.
PVA: 03E8Hex in the PVA part tells that the value
of 3-41 Ramp 1 Ramp Up Time is 1000, which
corresponds to 10.00.
STW: 0F07 Hex means that the motor is running
and there are no warnings or faults (for details
see Table 6.15).
MAV: 2000 Hex indicates that the output
frequency is 50% of the maximum reference.
Value
21
55
00
00
00
00
03
E8
0F
07
20
00
MG90U302