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Operating Instructions – MOVITRAC® B
5
Communication and unit profile
Startup
The frequency inverter only receives and returns the parameter channel while the con-
troller is preparing the parameter channel for the write service. The service is not acti-
vated until the moment when the handshake bit is changed (in this example, when it
changes from "0" to "1"). The frequency inverter now interprets the parameter channel
and processes the write service; however, it continues to respond to all telegrams with
handshake bit = 0. Confirmation that the service has been executed occurs when the
handshake bit in the response telegram of the frequency inverter is set to the same
value. The master now detects that the received handshake bit is once again the same
as the one which was sent. It can now prepare another parameter setting procedure.
5.11.7 Notes on parameterization
By setting the parameters of the MOVITRAC
®
B frequency inverter via the fieldbus sys-
tem, you can generally reach all drive parameters. As some drive parameters are di-
rectly related to the communication via fieldbus, it is important to note the following:
Parameter setting
in CONTROLLER
INHIBIT status
Some parameters can only be changed (written) in
CONTROLLER INHIBIT
drive status.
The inverter signals this by a negative acknowledgement of the write service. Refer to
the parameter list to see what parameters are subject to this limitation. In general, these
parameters can be changed during a fault or
24 V operation
.
Factory setting
Activating the factory setting means nearly all parameters are reset to their default val-
ues. The consequence for bus operation is that the control signal source and setpoint
source are reset to their default values.
Parameter lock
The parameter lock is activated by setting
P803 Parameter lock = Yes
. It protects all ad-
justable parameters from being changed. Activating parameter lock is useful when all
inverter parameters have been set and need not be changed anymore. With this param-
eter, you can prevent drive parameters from being modified, for example via keypad.
INFORMATION
The frequency inverter must be enabled at the terminals for control via process data.
This means that the drive is enabled under certain conditions when the inverter is reset
to the factory settings. Make sure before activating the factory settings that the signals
of the digital inputs will not enable the frequency inverter once the factory settings
have been restored. As a precaution, do not switch on the supply system voltage until
you have completed inverter parameterization.
INFORMATION
The parameter lock generally prevents the writing of parameters. Consequently, write
access via communication interfaces is also blocked when the parameter lock is ac-
tive.
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Summary of Contents for Movitrac B
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