Danfoss FC 300 Profibus User Manual

FC 300 Profibus
How to Access FC 300 Parameters
The process data within the P CD 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 above example may look
like this:
Byte Value
PCA 1 20
PCA 2 CF
IND 3 00
IND 4 00
PVA 5 00
PVA 6 00
PVA 7 03
PCV
PVA 8 E8
STW 9 0F
STW 10 07
MAV 11 20
PCD
MAR 12 00
The PCD part responds according to the state and parameterisation of the frequency converter.
The PCV part responds as:
PCA: As the request telegram, but here the RC part is taken from the response table, see the PCA handling
section. 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 par. 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 the
Status word table in the Status word section).
MAV: 2000 Hex indicates that the output frequency is 50% of the maximum frequency.
A negative response may look like this:
Byte Value
PCA 1 70
PCA 2 00
IND 3 00
IND 4 00
PVA 5 00
PVA 6 00
PVA 7 00
PCV
PVA 8 02
STW 9 0F
STW 10 07
MAV 11 20
PCD
MAR 12 00
RC is 7 Hex, which means that the request has been rejected, and the fault number can be found in the
PVA part. In this case the fault number is 2, which means that the upper or lower limit of the parameter is
exceeded. See the fault number table in the PCA handling section.
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Danfoss FC 300 Profibus Specifications

General

Brand	Danfoss
Model	FC 300 Profibus
Category	DC Drives
Language	English