YASKAWA GA800 Technical Reference page 1004

12.9 L: Protection Functions
3 : Finless
Use this setting to install a finless drive.
■
L8-38: Carrier Frequency Reduction
No.
Name
(Hex.)
L8-38 Carrier Frequency Reduction
(04EF)
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%.
■
L8-40: Carrier Freq Reduction Off-Delay
No.
Name
(Hex.)
L8-40 Carrier Freq Reduction Off-
Delay
(04F1)
Set L8-40 ≠ 0.00 to enable the carrier frequency reduction function during start-up. When operation starts, the drive
automatically decreases the carrier frequency. When the time set in L8-40 is expired, the carrier frequency returns to
the value set in C6-02 [Carrier Frequency Selection].
■
L8-41: High Current Alarm Selection
No.
Name
(Hex.)
L8-41 High Current Alarm
Selection
(04F2)
0 : Disabled
The drive will not detect HCA [Current Alarm].
1 : Enabled
If the output current is more than 150% of the drive rated current, the drive will detect HCA.
The MFDO terminal set for an alarm [H2-01 to H2-03 = 10] activates.
1004
V/f CL-V/f OLV CLV AOLV
Sets the carrier frequency reduction function. The drive reduces the carrier frequency when the
output current is more than a specified level.
V/f CL-V/f OLV CLV AOLV
Sets the length of time until the automatically reduced carrier frequency returns to the condition
before the reduction.
V/f CL-V/f OLV CLV AOLV
Sets the function to cause an HCA [Current Alarm] when the output current is more than 150% of the
drive rated current.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Default
(Range)
Determined by A1-02, C6-
01 and o2-04
(0 - 2)
Default
(Range)
Determined by A1-02
(0.00 - 2.00 s)
Default
(Range)
0
(0, 1)