Parameter Details
11
11.9 L: Protection Function
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 767
As decreasing the carrier frequency increases the overload tolerance, the overload capacity is increases
temporarily for oL2 [Drive Overloaded], allowing the drive to run through transient load peaks without tripping.
0 : Disabled
No carrier frequency reduction at high current.
1 : Enabled below 6 Hz
The carrier frequency is reduced at speeds below 6 Hz when the current exceeds 100% of the drive rated current.
The drive returns to the normal carrier frequency when the current falls below 88% or the output frequency
exceeds 7 Hz.
2 : Enabled for All Speeds
The carrier frequency is reduced at the following speeds:
• Output current is at least 100% of the drive rated current while the frequency reference is lower than 6 Hz.
• Output current is at least 112% of the drive rated current while the frequency reference is higher than or equal to
7 Hz.
The drive uses the delay time set in L8-40 [CarrierFreqReduct Off DelayTime] and a hysteresis of 12% when
switching the carrier frequency back to the set value.
■ L8-39: Carrier Freq Reduction during oL
No.
(Hex.)
Name Description
Default
(Range)
L8-39
(04F0)
Carrier Freq Reduction
during oL
Sets the low carrier frequency when IGBT protection is enabled.
Determined by o2-04
(1.0 - 15.0 kHz)
Sets the low carrier frequency when IGBT protection is enabled.
■ L8-40: Carrier Freq Reduction Off-Delay
No.
(Hex.)
Name Description
Default
(Range)
L8-40
(04F1)
Carrier Freq Reduction Off-
Delay
Sets the length of time until the automatically reduced carrier frequency returns to the condition
before the reduction.
Determined by A1-02
(0.00 - 2.00 s)
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.
(Hex.)
Name Description
Default
(Range)
L8-41
(04F2)
High Current Alarm
Selection
Triggers an HCA [Current Alarm] when the output current exceeds 150% of the drive rated
current.
1
(0, 1)
0 : Disabled
An HCA is not detected.
1 : Enabled
An HCA is triggered when the output current exceeds 150% of the drive rated current.
The MFDO terminal set for Alarm [H2-01 to H2-05 = 10] turns ON.
■ L8-55: Internal DB TransistorProtection
No.
(Hex.)
Name Description
Default
(Range)
L8-55
(045F)
Internal DB
TransistorProtection
Sets the protection function for the internal braking transistor.
1
(0, 1)
0 : Disable
Disables braking transistor protection.
Use this setting in the following situation. Enabling the braking transistor in the following situations may cause an
rF [Braking Resistor Fault].
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