YASKAWA HV600 Manual page 388

2.9 L: Protection Functions
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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.
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 and the frequency reference is 7 Hz or more.
When the drive switches the carrier frequency to the set value, it uses a hysteresis of 12%.
3 : Enable at Overload
The drive decreases the carrier frequency at one of these conditions:
• Output frequency is less than 6 Hz and output current is more than 120%
• Output frequency is 7 Hz or more and the IGBT temperature detected by thermistor is high
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L8-41: High Current Alarm Selection
No.
Name
(Hex.)
L8-41 High Current Alarm
Selection
(04F2)
0 : Disabled
The drive will not detect an HCA.
1 : Enabled
If the output current is more than 150% of the drive rated current, the drive will detect an HCA.
The MFDO terminal set for an alarm [H2-01 to H2-03 = 10] activates.
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L8-90: STPo Detection Level (Low Speed)
No.
Name
(Hex.)
L8-90 STPo Detection Level (Low
Speed)
(0175)
Expert
This function detects when PM motors are not synchronized.
The drive cannot detect when motors are not synchronized because the frequency reference is low during start up and
the motor is locked. If fault detection is necessary in these conditions, set the control fault detection level to enable
detection of desynchronization because of motor locking. Increase the setting in 5-unit increments.
388
V/f OLV/PM EZOLV OLV/PM
Sets the carrier frequency reduction function. The drive decreases the carrier frequency when the
output current is more than a specified level.
V/f OLV/PM EZOLV OLV/PM
Sets the function to cause an HCA [High Current Alarm] when the output current is more than 150%
of the drive rated current.
V/f OLV/PM EZOLV OLV/PM
Sets the detection level that the control fault must be equal to or more than to cause an STPo [Motor
Step-Out Detected].
Description
Description
Description
YASKAWA TOEPYAIHV6002A HV600 Drive Programming
Default
(Range)
Determined by A1-02 and
o2-04
(1 - 3)
Default
(Range)
0
(0, 1)
Default
(Range)
0 times
(0 - 5000 times)