Parameter descriptions
623 Starting current
The
Starting current 623 ensures, particularly for high-torque start, a sufficient torque until the Fre-
quency 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.
I
FIN
: Nominal value of frequency inverter
o
c
: Overload capacity of frequency inverter.
In the following settings, the starting current impression is used for the starting behavior:
−
Configuration 30 = "110 - IM: sensor-less control" (V/f control of asynchronous motor),
Operation mode 620 =2, 4, 12 or 14
−
Configuration 30= "410 - IM: sensor-less field-orientated control (DMC)", asynchronous motor
−
Configuration 30= "610 - PMSM: sensor-less field-orientated control (DMC)", synchronous motor
624 Frequency limit
The
Starting current 623 is impressed until the Frequency limit 624 is reached. Permanent operating
points below the frequency limit are only permissible if forced-ventilated motors are used.
The transition to the control method of the selected
Configuration 30 takes place above the frequen-
cy limit.
The
Frequency limit 624 is set up automatically during the guided motor commissioning in field ori-
ented control configurations 410 and 610. In V/f control configuration 110 the parameter
Frequency
limit
624 is not changed by the guided motor commissioning.
In the following settings, the starting current impression is used for the starting behavior:
−
Configuration 30 = "110 - IM: sensor-less control" (V/f characteristic of asynchronous motor),
Operation mode 620 =2, 3, 4, 12 or 14
−
Configuration 30= "410 - IM: sensor-less field-orientated control (DMC)", asynchronous motor
−
Configuration 30= "610 - PMSM: sensor-less field-orientated control (DMC)", synchronous motor
625 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 effected only after the
Brake release time 625 has
elapsed. The time should be set such that it is at least as long as the time required for releasing the
holding brake. By using negative values for the parameter, release of the brake is delayed. This can
be done in order to prevent loads from falling down, for example.
125
Operational Behavior 06/2013 Operating Instructions
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