YASKAWA GA700 Series Technical Manual page 913

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L8-20: Control Fault & Step Out Detect
No.
Name
(Hex.)
L8-20 Control Fault & Step Out
Detect
(04C0)
Expert
If you enter a Stop command but it cannot stop drive operation, the drive will detect CF.
0 : Disabled
1 : CF/STPo Detection Enabled
2 : CF ALM/Stop
The drive stops DC injection braking as specified by the value of b2-03 [DC Inject Braking Time at Start].
Note:
• When A1-02 = 4, control will not be stable if you do not do Rotational Auto-Tuning. This can cause CF faults if you ramp to stop. If
the drive detects CF, do Rotational Auto-Tuning and Line-to-Line Resistance Tuning. Also, do Line-to-Line Resistance Tuning.
• If you set A1-02 = 4 and set these parameters, the drive can detect CF because it cannot stop the operation in some load conditions.
Make sure that you do Rotational Auto-Tuning and Line-to-Line Resistance Tuning correctly and then set L8-20 = 0.
–d5-01 = 1 [Torque Control Selection = Torque Control]
–L3-11 = 1 [Overvoltage Suppression Select = Enabled]
–Decreased L7-01 to L7-04 [Torque Limit].
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L8-27: Overcurrent Detection Gain
No.
Name
(Hex.)
L8-27 Overcurrent Detection Gain
(04DD)
Note:
• The overcurrent detection function detects the lower of these two values:
–Drive overcurrent level
–Motor rated current × L8-27 / 100
• Set L7-xx [Torque Limit] parameters to a smaller value than the setting of L8-27.
• On drives with software versions PRG:1022 and later, this function is disabled when you set L8-27 = 0.0. Under usual circumstances,
do not set L8-27 = 0.0. If the drive rated current is much higher than the motor rated current, PM motor magnets can demagnetize
when current flows at the drive overcurrent detection level. The "PRG" column on the nameplate on the right side of the drive identifies
the software version. You can also use U1-25 [Software Number] to identify the software version.
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L8-29: Output Unbalance Detection Sel
No.
Name
(Hex.)
L8-29 Output Unbalance
Detection Sel
(04DF)
This function prevents damage to PM motors. Current unbalance can heat a PM motor and demagnetize the
magnets. When the current is unbalanced, the drive will detect LF2 to stop the motor and prevent damage to the
motor.
0 : Disabled
1 : Enabled
Note:
You must set E9-01 = 1 [Motor Type Selection = Permanent Magnet (PM)] and A1-02 = 8 [EZOLV] to show L8-29.
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L8-31: LF2 Detection Time
No.
Name
(Hex.)
L8-31 LF2 Detection Time
(04E1)
When the output current is unbalanced for longer than the time set in L8-31, the drive detects LF2.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
V/f CL-V/f OLV CLV AOLV
Sets operation after the drive detects a CF fault when A1-02 = 4 [Control Method Selection =
Advanced Open Loop Vector].
V/f CL-V/f OLV CLV AOLV
Sets the PM motor overcurrent detection level as a percentage of the motor rated current value.
V/f CL-V/f OLV CLV AOLV
Sets the function to detect LF2 [Output Current Imbalance].
V/f CL-V/f OLV CLV AOLV
Sets the LF2 [Output Current Imbalance] detection time.
12.9 L: Protection Functions
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
1
(0 - 2)
Default
(Range)
300.0%
(0.0 - 1000.0%)
Default
(Range)
1
(0, 1)
Default
(Range)
3
(1 – 100)
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