12.1.1.1 Starting Current
The Starting current 623 ensures, particularly for high-torque start, a sufficient
torque until the Frequency limit 624 is reached.
Applications in which high current is permanently needed at a low speed are to be
realized using forced-ventilated motors to prevent thermal overload.
FIN
= Nominal Output current of Frequency inverter
o: Overload capability of Frequency inverter
In the following settings, the starting current impression is used for the starting be-
havior:
− Configuration 30 = 1xx (V/f control of asynchronous motor),
Operation mode 620 =2, 4, 12 or 14
− Configuration 30= 4xx (FOC of an asynchronous motor)
−
Configuration 30= 610 (PMSM: sensor-less field-orientated control -DMC), syn-
chronous motor
12.1.1.2 Frequency Limit
The Starting current 623 is impressed in configurations 1xx, 4xx and 6xx for control
in the selected configuration until the Frequency limit 624 is reached. Perma
operating points below the frequency limit are only admissible if forced-
motors are used.
The transition to the control method of the selected configuration 30
above the frequency limit.
The Frequency limit 624 is set up automatically during the guided motor commis-
sioning in field oriented control configurations 4xx and 6xx. In V/f control configura-
tions 1xx the parameter
Frequency limit 624
is not changed by the guided motor
commissioning.
12.1.1.3 Brake release time
In order to protect the motor holding brake against damage, the motor may only
start after the brake has been released. Startup to reference speed is affected only
after the Brake release time 625 has elapsed. The time should be set such that it
at least as long as the time required for releasing the holding brake. By using nega-
tive values for the parameter, release of the brake is delayed. This can be done in
order to prevent loads from falling down, for example.
136 Operating Instructions ACU 06/13
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