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FC 300 Interbus Operating Instructions
5. How to Control the FC 300
5.1.1. Process Data
The Process Data provides an agile way of controlling the FC 300 frequency converter. Two different telegram-types are for process data are supported:
•
Standard Telegram 1, is a telegram with 4 PCD's. The two first PCD's is for holding Control word and reference for Master-to-slave comm. And
Status word and Main Actual Value for Slave-to-master comm. The last two PCD's (3 and 4) is reserved for future use, and contains only 0's.
•
Custom Telegram 1, is a telegram with 4 PCD's that in addition also holds information on digital and analogue I/O's and torque limit.
See section
How to Install
for more information on how to select the different telegram profiles.
5.1.2. Standard Telegram 1
The Process Data length is fixed to 4 words, each of two bytes, with the following format:
Master
slave
→
PCD
Name
1
Control Word
2
Reference
Slave
master
→
PCD
Name
1
Status Word
2
Actual value
Function
Sends the Control Word to the frequency converter. The format depends of the setting of par.
8-10.
Sends the reference in %. See section:
Function
Sends the Status word from the frequency converter. The format depends of the setting of par.
8-10.
Sends actual output frequency in %. See section:
MG.33.H3.02 - VLT is a registered Danfoss trademark
5. How to Control the FC 300
Bus speed reference value
.
Bus speed reference Value
5
.
17
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