u
L8: Drive Protection
No.
(Addr.
Hex)
Name LCD Display Description Values Page
L8-01
(04AD)
Internal Dynamic
Braking Resistor
Protection Selection
(ERF type)
DB Resistor Prot
0: Not Provided
1: Provided
0: Resistor overheat protection disabled
1: Resistor overheat protection enabled
Note: This parameter is not available in models
4A0930 and 4A1200.
Default: 0
Range: 0, 1
–
L8-02
(04AE)
Overheat Alarm Level OH Pre-Alarm Lvl
An overheat alarm occurs when heatsink temperature exceeds
the L8-02 level.
Default:
<1>
Min.: 50 °C
Max.: 150 °C
–
L8-03
(04AF)
Overheat Pre-Alarm
Operation Selection
OH Pre-Alarm Sel
0: Ramp to Stop
1: Coast to Stop
2: Fast-Stop
3: Alarm Only
4: Run@L8-19 Rate
0: Ramp to stop. A fault is triggered.
1: Coast to stop. A fault is triggered.
2: Fast Stop. Decelerate to stop using the deceleration time in
C1-09. A fault is triggered.
3: Continue operation. An alarm is triggered.
4: Continue operation at reduced speed as set in L8-19.
Default: 3
Range: 0 to 4
–
L8-05
(04B1)
Input Phase Loss
Protection Selection
Inp Ph Loss Det
0: Disabled
1: Enabled
Selects the detection of input current phase loss, power supply
voltage imbalance, or main circuit electrolytic capacitor
deterioration.
0: Disabled
1: Enabled
Default: 1
Range: 0, 1
–
L8-07
(04B3)
Output Phase Loss
Protection Selection
Outp Ph Loss Det
0: Disabled
1: 1PH Loss Det
2: 2/3PH Loss Det
0: Disabled
1: Enabled (triggered by a single phase loss)
2: Enabled (triggered when two phases are lost)
Default: 1
Range: 0 to 2
–
L8-09
(04B5)
Output Ground Fault
Detection Selection
Grnd Flt Det Sel
0: Disabled
1: Enabled
0: Disabled
1: Enabled
Default:
<1>
Range: 0, 1
–
L8-10
(04B6)
Heatsink Cooling Fan
Operation Selection
Fan On/Off Sel
0: Dur Run (OffDly)
1: Always On
0: Run with timer (Fan operates only during run and for L8-11
seconds after stop.)
1: Run always (Cooling fan operates whenever the drive is
powered up.)
Default: 0
Range: 0, 1
–
L8-11
(04B7)
Heatsink Cooling Fan
Off Delay Time
Fan Delay Time
Sets a delay time to shut off the cooling fan after the Run
command is removed when L8-10 = 0.
Default: 60 s
Min.: 0
Max.: 300
–
L8-12
(04B8)
Ambient Temperature
Setting
Ambient Temp
Enter the ambient temperature. This value adjusts the oL2
detection level.
Default: 40 °C
Min.: -10
Max.: 50
–
L8-15
(04BB)
oL2 Characteristics
Selection at Low Speeds
OL2 Sel @ L-Spd
0: Disabled
1: Enabled
0: No oL2 level reduction below 6 Hz.
1: oL2 level is reduced linearly below 6 Hz. It is halved at 0
Hz.
Default: 1
Range: 0, 1
–
L8-18
(04BE)
Software Current Limit
Selection
Soft CLA Sel
0: Disabled
1: Enabled
0: Disabled
1: Enabled
Default: 0
Range: 0, 1
–
L8-19
(04BF)
Frequency Reduction
Rate during Overheat
Pre-Alarm
Fc Red dur OHAlm
Specifies the frequency reference reduction gain at overheat
pre-alarm when L8-03 = 4.
Default: 0.8
Min.: 0.1
Max.: 0.9
–
L8-27
(04DD)
Overcurrent Detection
Gain
OC Level
Sets the gain for overcurrent detection as a percentage of the
motor rated current. Overcurrent is detected using the lower
value between the overcurrent level of the drive or the value
set to L8-27.
Default: 300.0%
Min.: 0.0
Max.: 400.0
–
L8-29
(04DF)
Current Unbalance
Detection (LF2)
LF2 Flt Det Sel
0: Disabled
1: Current&Voltage
2: Current Det Type
3: Voltage Det Type
For models 2A0004 to 2A0415, 4A0002 to 4A0675, and
5A0003 to 5A0242:
0: Disabled
1: Enabled (current and voltage detection)
2: Enabled (current detection)
3: Enabled (voltage detection)
For models 4A0930 and 4A1200:
0: Disabled
1: Enabled (current detection)
Default: 1
Range: 0 to 3
Range: 0, 1
–
B.8 L: Protection Function
306
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
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