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5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
317
5
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.
Note:
The cooling fan will always turn on when a damping resistor overheat (doH) is detected regardless of the setting value.
Setting 1: Run always
The fan runs whenever power is supplied to the drive.
■
L8-11: Heatsink Cooling Fan Off-Delay Time
Sets the cooling fan switch off-delay time if parameter L8-10 is set to 0.
■
L8-12: Ambient Temperature Setting
If the temperature where the drive is mounted is above the specified values, the drive rated current must be reduced for
optimal performance life. By setting the ambient temperature to parameter L8-12 and adjusting the installation method
setting in L8-35, the drive rating automatically adapts to safe values. Refer to
Temperature Derating on page 462
for
detail.
■
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
premature output transistor failures. Set this parameter to 0 (Protection disabled at low speed) when protection is
activated for an oL2 fault for a light load at low speed.
Note: 1.
Contact Yaskawa before using the drive for applications for which the setting is 0 (disabled).
2.
Do not set this parameter to 0 (disabled) in V/f or OLV control.
3.
Do not set this parameter to 0 (disabled) for models 4
0302 to 4
0930.
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 drive faults.
Setting 1: protection enabled at low speed
The overload protection level (oL2 fault detection level) is automatically reduced at speeds below 6 Hz.
■
L8-18: Software Current Limit 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 this function.
Note:
This setting should not be changed unless absolutely necessary.
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 soft 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
L8-11
Heatsink Cooling Fan Off-Delay Time
0 to 300 s
60 s
No.
Name
Setting Range
Default
L8-12
Ambient Temperature Setting
-10 to 50°C
40°C
No.
Name
Setting Range
Default
L8-15
oL2 Characteristics Selection at Low Speed
0 or 1
1
No.
Name
Setting Range
Default
L8-18
Software Current Limit Selection
0 or 1
Determined by A1-02
SIEP_C710636_02B_1_0.book 317 ページ 2015年11月25日 水曜日 午後4時56分