SKS Sweden Bonfiglioli Vectron ACTIVE CUBE ACU 201 Series, Operating Instructions Manual

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Operating Instructions ACU
09/08
Multiple motor operation
Parameter
Operation Mode
571 = 1
or 11
In multiple motor operation, it is assumed that each data set is assigned to a corres-
ponding motor. For this, one motor and one motor protection switch are assigned to
each data set. In this operation mode, the rated values of the active data set are
monitored. The current output current of the frequency inverter is only taken into
account in the motor protection switch activated by the data set. In the motor pro-
tection switches of the other data sets, zero current is expected, with the result that
the thermal decay functions are taken into account. In combination with the data set
change-over, the function of the motor protection switch is similar to that of motors
connected alternately to the mains with their own protection switches.
Single motor operation
Parameter
Operation Mode
571 = 2
or 22
In single motor operation, only one motor protection switch, which monitors the out-
put current of the frequency inverter, is active. In the case of a data set change-over,
only the switch-off limits derived from the rated machine parameters are changed
over. Accumulated thermal values are used after the change-over as well. In the case
of the data set change-over, please ensure that the machine data are stated identi-
cally for all data sets. In combination with the data set change-over, the function of
the motor protection switch is similar to that of motors connected alternately to the
mains with one common protection switch.
Motor protection, in particular self-ventilation motors, is improved via the
Frequency
limit
572
which can be set as a percentage of the rated frequency. The measured
output current in operating points below the frequency limit is assessed by a factor of
2 higher in the calculation of the trigger characteristic.
Parameter Settings
No. Description Min. Max. Fact. sett.
572 Frequency Limit 0 % 300 % 0 %
Output signals
Digital signals indicate the triggering of the function “Motor Protection Switch”.
180 -
Warning Motor
Protection Switch
1)
Triggering of the function “Motor Protection Switch”
according to
Operation Mode
571 is signalized.
14 -
2)
1)
For linking with inverter functions
2)
For digital output
Operating Instructions ACU 09/08 220