IMO Jaguar CUB, Инструкция по эксплуатации

Страница: 99 / 170

5-27
F43, F44
Current Limiter (Operation condition and Limiting level)
F43 enables or disables the current limiter. If it is enabled, the inverter controls the
output frequency while keeping the current set to F44 in order to prevent the motor
from stalling.
With F43, you may select whether the current limiter works during constant speed
operation only (F43 = 1) or during both acceleration and constant speed operation
(F43 = 2). Set F43 to 1, for example, to drive the motor at maximum performance in
the acceleration zone and to limit the drive current in the constant speed zone.
For three-phase 200V and single-phase 200V series inverters
The limiting level setting for the three-phase 200V and single-phase 200V
series should be calculated from the current limiting level
I
limit
(A) based
on the reference current I
ref
(A), as shown below.
100
(A)
(A)
= (%) Setting
ref
limit
u
I
I
(Example) Setting the current limiting level I
limit
at 4.2 A for 0.75 kW
standard motors
84 100
(A) 5.0
(A) 4.2
= (%) Setting
u
The reference current is given in the table for F20 to F22 on page
5-24.
• The current limiting feature selected by F43 and F44 are implemented
by software, so an operational delay may occur. To avoid the delay,
use the current limiter (hardware) simultaneously (H12 = 1).
• If an overload is applied when the limiting level is set extremely low,
the inverter will immediately lower its output frequency. This may
cause an overvoltage trip or dangerous turnover of the motor rotation
due to undershooting.
If the current limiter function has been activated, the inverter may operate at an ac-
celeration/deceleration time or frequency different from the set ones. The machine
should be so designed that safety is ensured even in any current limiter operation.
Otherwise an accident could occur.