5
Setting Inverter Parameters
The drive parameters are read/written via the fieldbus system, using the READ and WRITE services
of the application layer (layer 7). If layer 7 is absent, a suitable application layer needs to be emulated,
i.e. mechanisms to assign frequency inverter parameters must be created. A parameter channel is
defined in these circumstances. For further information on this subject refer to the User Manuals of
the relevant option pcbs.
5.1
Parameter Setting Procedure
Parameter setting of the MOVITRAC
®
31.. frequency inverter is generally carried out according to a
master-slave pattern, i.e. the inverter only supplies the information requested if asked to do so by
the higher-level automation equipment. Thus MOVITRAC
®
31.. invariably has slave functionality only
(
→
Fig. 26).
Functions such as READ or WRITE are normally provided from the master module or the higher-level
automation equipment so that adjustment of inverter parameters can be carried out via the
corresponding fieldbus system. Please see the User Manual for the fieldbus option pcb you are using
for further information regarding inverter parameter adjustment.
5.1.1
Index Addressing
All MOVITRAC
®
31.. frequency inverter parameters are listed in a separate document called the
MOVITRAC
®
31.. Parameter List. Each parameter is assigned a specific number (index) under which
the parameter can be read or written. The index given in the
MOVITRAC
®
31.. Parameter List is the
index for the serial interface
. The value 1000
dec
must be added to this index for access via the fieldbus
interface.
M
O
VI
TRAC
®
841
E
Q
RUN
BUS
FAULT
Master
Slave
Indication
Response
Request
Confirmation
FIELDBUS
CONTROL MODE
00333AEN
Fig. 26: Parameterizing the inverter to the master-slave-pattern
Setting Inverter Parameters
5
46
MOVITRAC
®
31.. Fieldbus Unit Profile
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