Operating Instructions ACU
Parameter Operation Mode 571 = 1, 11, 101 or 111
In multiple motor operation, it is assumed that each data set is assigned to a corresponding motor.
For this, one motor and one motor circuit breaker 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 circuit breaker activated by the data set.
In the motor circuit breakers 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 circuit breakers is similar to that of motors connected alternately to the mains
with their own circuit breakers.
In addition, in Operation Modes 101 and 111, the integrated current will be saved permanently
when the device is turned off and set to the saved value upon restart.
Parameter Operation Mode 571 = 2, 22, 102 or 122
In single motor operation, only one motor circuit breaker, which monitors the output 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 identically for all data sets. In combination with the data set change-over, the
function of the motor circuit breaker is similar to that of motors connected alternately to the mains
with one common circuit breaker.
In addition, in Operation Modes 102 and 122, the integrated current will be saved permanently
when the device is turned off and set to the saved value upon restart.
Parameter Operation Mode 571 = 101, 102, 111 or 122.
The internal state of the motor circuit breaker is saved permanently (reset-proof). These settings are
to be used in the case of regular short-time mains failure/disconnection. This guarantees correct
motor protection for the application even in the case of short-time mains failure/disconnection.
Motor protection, in particular self-ventilation motors, is improved via a Frequency Limit 572 which
can be set as a percentage of the rated frequency.
Digital signals signal that of the function "motor circuit breaker" has been triggered.
Triggering of “motor circuit breaker” function as per Operation Mode
571 is reported.
1)
For linking to frequency inverter functions
2)
For output via a digital output.
In Operation Modes 101, 102, 111 and 122, the function set in parameter Operation
Mode 571 should be the same in all data sets.
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