|
No.
(Hex.)
|
Name
|
Description
|
Default
(Range)
|
|
L8-38
(04EF)
|
Carrier Frequency Reduction
|
        
Sets the carrier frequency reduction function. The drive reduces the carrier frequency when the output current is more than a specified level.
|
Determined by A1-02, C6-01 and o2-04
(0 - 2)
|
If you decrease the carrier frequency, it increases the overload tolerance. The overload capacity increases temporarily for oL2 [Drive Overloaded] and lets the drive operate through transient load peaks and not trip.
- 0
- Disabled
-
The drive will not decrease the carrier frequency at high current.
- 1
- Enabled below 6 Hz
-
The drive decreases the carrier frequency at speeds less than 6 Hz when the current is more than 100% of the drive rated current.
When the current is less than 88% or the output frequency is more than 7 Hz, the drive goes back to the usual carrier frequency.
- 2
- Enabled for All Speeds
-
The drive decreases the carrier frequency at these speeds:
-
Output current is a minimum of 100% of the drive rated current and the frequency reference is less than 6 Hz.
-
Output current is a minimum of 109% of the drive rated current, the drive is in Normal Duty mode, and the frequency reference is 7 Hz or more.
-
Output current is a minimum of 112% of the drive rated current, the drive is in Heavy Duty mode, and the frequency reference is 7 Hz or more.
When the drive switches the carrier frequency to the set value, it uses the delay time set in L8-40 [CarrierFreqReduct Off DelayTime] and a hysteresis of 12%.