2.8 L: Protection Functions
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YASKAWA ELECTRIC
TOEP C710687 03B FSDrive-MV1000 Parameter Guide
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L8-10: Cooling Fan Operation Selection
Selects the cooling fan operation.
Setting 0: Run with timer
The fan is switched on when a Run command is active. It is switched off with the delay set in parameter L8-11 after the
Run command has been released. Using this setting extends the fan lifetime.
Setting 1: Operates when the Uv (DC bus undervoltage) fault has been cleared
The fan starts operating when the voltage of the DC bus rises above the Undervoltage Detection Level (Uv) set in L2-05.
Setting 2: Operates when the control power supply is ON
The cooling fan runs all the time while control power is being supplied to the drive.
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L8-11: Cooling Fan Off-Delay Time
Sets the cooling fan switch off-delay time if parameter L8-10 is set to 0.
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L8-15: oL2 Characteristics Selection at Low Speeds
Selects whether the drive overload capability (oL fault detection level) is reduced at low speeds in order to prevent the
Power Cell IGBT failures.
Note:
Contact Yaskawa for consultation first before disabling this setting.
Setting 0: Protection disabled at low speed
The overload protection level is not reduced. Frequently operating the drive with high output current at low speed can
lead to premature IGBT faults.
Setting 1: Protection enabled at low speed
The overload protection level (oL2 fault detection level) is automatically reduced at speeds below 6 Hz.
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L8-18: Software CLA Selection
The Software Current Limit (CLA) is a drive protection function that prevents main circuit transistor failures caused by
high current. Parameter L8-18 enables or disables a drive protection function.
Note:
This setting should not be changed unless absolutely necessary. For proper drive protection and operation leave the Software
CLA function enabled.
Setting 0: Software CLA disabled (gain = 0)
The drive may trip on an oC fault if the load is too heavy or the acceleration is too short.
Setting 1: Software CLA enabled
When the software CLA current level is reached, the drive reduces the output voltage in order to reduce the current. If the
current level drops below the Software CLA level, then normal operation will continue.
No.
Name
Setting Range
Default
L8-10
Cooling Fan Operation Selection
0 to 2
1
No.
Name
Setting Range
Default
L8-11
Cooling Fan Off Delay Time
0 to 1800 s
600 s
No.
Name
Setting Range
Default
L8-15
oL2 Characteristics Selection at Low Speeds
0, 1
1
No.
Name
Setting Range
Default
L8-18
Software CLA Selection
0, 1
1
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