5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 233
Parameter Details
5
Setting 0: IP20 enclosure drive
For an IP20 enclosure drive installed with at a minimum of 30 mm space to the next drive or a cabinet wall.
Setting 1: Side-by-Side mounting
For drives mounted according to Yaskawa’s Side-by-Side specifications (requires 2 mm between drives).
Setting 2: NEMA Type 1
For drives compliant with NEMA Type 1 enclosure specifications.
Setting 3: Finless model or external heatsink Installation
For finless drives or a standard drive mounted with the heatsink outside the cabinet or enclosure panel.
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L8-38: Carrier Frequency Reduction Selection
Lets the drive reduce the carrier frequency when the output current exceeds a certain level. This temporarily increases the
overload capability (oL2 detection), allowing the drive to run through transient load peaks without tripping.
L8-38 selects the operation of the carrier frequency reduction function.
Note: This function cannot be used in Advanced Open Loop Vector for PM motors.
Setting 0: Disabled
No carrier frequency reduction at high current.
Setting 1: Enabled for output frequencies 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 its normal carrier frequency when the current falls below 88% or the output frequency exceeds 7 Hz.
Setting 2: Enabled for entire frequency range
The carrier frequency is reduced at the following speeds:
• Below 6 Hz when the current exceeds 100% of the drive rated current.
• Above 7 Hz when the current exceeds 112% of the drive rated current.
The drive uses the delay time set in parameter L8-40 and a hysteresis of 12% when switching the carrier frequency back
to the set value.
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L8-40: Carrier Frequency Reduction Off-Delay Time
Sets a hold time before returning to the original carrier frequency setting after the carrier frequency has been temporarily
derated as determined by L8-38. The carrier frequency reduction function is disabled if this value is 0.00 s.
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L8-41: High Current Alarm Selection
Triggers a high current alarm (HCA) when the output current rises too much.
Setting 0: Disabled
No alarm is detected.
Setting 1: Enabled
An alarm is triggered when the output current exceeds 150% of the drive rated current. A digital output set for an alarm
(H2- = 10) will close.
No. Name Setting Range Default
L8-38 Carrier Frequency Reduction Selection 0 to 2
Determined by A1-02 and
o2-04
No. Name Setting Range Default
L8-40 Carrier Frequency Reduction Off-Delay Time 0.00 to 2.00 s Determined by A1-02
No. Name Setting Range Default
L8-41 High Current Alarm Selection 0 or 1 0
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