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KFU 2-/4-
114
11.1.1.1 Starting
Current
Configurations 110, 111 and 410, 411 and 430 for control of a 3-phase machine use
the starting current impression in operation modes 2, 4, 12 and 14 for the parameter
Operation mode
620
. The
Starting current
623
guarantees, in particular for high
start torque, sufficient torque to reach the
Frequency limit
624
.
Applications in which high current is permanently needed at a low speed are to be
realized using forced-ventilated motors for thermal reasons.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
623 Starting Current
0.0 A
ü
I
FUN
I
FUN
11.1.1.2 Frequency
Limit
The
Starting current
623
is impressed in configurations 110, 111, 410, 411 and 430
for control of a 3-phase machine until the
Frequency limit
624
is reached. Permanent
operating points below the frequency limit are only admissible if forced-ventilated
motors are used.
The transition to the control method of the selected
configuration
30
takes place
above the frequency limit.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
624 Frequency Limit
0.00 Hz
100.00 Hz
2.60 Hz
11.1.1.3
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 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 pre-
vent loads from falling down, for example.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
625 Brake release time
-5000 ms
5000 ms
0 ms