Parameter List
11
11.11 L: Protection Functions
YASKAWA SIEPC71061753C GA500 Technical Manual 427
No.
(Hex.)
Name Description
Default
(Range)
Ref.
L8-15
(04BB)
Drive oL2 @ Low Speed
Protection
Sets the function to decrease the drive overload level at which the drive will trigger oL2
[Drive Overload] during low speed operation (6 Hz or slower) to prevent damage to the
main circuit transistors.
Note:
Contact Yaskawa or your nearest sales representative before disabling this function
at low speeds. If you frequently operate drives with high output current in low
speed ranges, it can cause heat stress and decrease the life span of drive IGBTs.
0 : Disabled (No Additional Derate)
1 : Enabled (Reduced oL2 Level)
1
(0, 1)
732
L8-18
(04BE)
Software Current Limit
Selection
Set the software current limit selection function to prevent damage to the main circuit
transistor caused by too much current.
0 : Disabled
1 : Enabled
0
(0, 1)
732
L8-19
(04BF)
Freq Reduction @ oH
Pre-Alarm
Sets the ratio at which the drive derates the frequency reference during an oH alarm.
0.8
(0.1 - 0.9)
732
L8-27
(04DD)
Overcurrent Detection
Gain
Sets the PM motor overcurrent detection level as a percentage of the motor rated current
value.
Note:
Parameter A1-02 [Control Method Selection] selects which parameter is the motor
rated current.
• A1-02 ≠ 8[EZOLV]: E5-03 [PM Motor Rated Current (FLA)]
• A1-02 = 8: E9-06 [Motor Rated Current (FLA)]
300.0%
(0.0 - 1000.0%)
732
L8-29
(04DF)
Output Unbalance
Detection Sel
Sets the function to detect LF2 [Output Current Imbalance].
0 : Disabled
1 : Enabled
1
(0, 1)
733
L8-31
(04E1)
LF2 Detection Time
Sets the LF2 [Output Current Imbalance] detection time.
3
(1 – 100)
733
L8-35
(04EC)
Installation Method
Selection
Sets the type of drive installation.
Note:
This parameter is set to the correct value when the drive is shipped.
0 : IP20/UL Open Type
1 : Side-by-Side Mounting
2 : IP20/UL Type1
3 : External Heatsink/Finless
0, 3
(0 - 3)
343
L8-40
(04F1)
Carrier Freq Reduction
Off-Delay
Sets the length of time until the automatically reduced carrier frequency returns to the
condition before the reduction.
Determined by A1-02
(0.00 - 2.00 s)
734
L8-41
(04F2)
High Current Alarm
Selection
Sets the function to cause an HCA [Current Alarm] when the output current is more
than 150% of the drive rated current.
0 : No
1 : Yes
0
(0, 1)
734
L8-51
(0471)
Expert
STPo I Detection Level
Sets the STPo [Motor Step-Out Detected] detection level as a percentage of the motor
rated current.
Note:
Parameter A1-02 [Control Method Selection] selects which parameter is the motor
rated current.
• A1-02 = 5 [OLV/PM]: E5-03 [PM Motor Rated Current (FLA)]
• A1-02 = 8 [EZOLV]: E9-06 [Motor Rated Current (FLA)]
0.0%
(0.0 - 300.0%)
734
L8-52
(0472)
Expert
STPo Integration Level
Sets the detection level for STPo [Motor Step-Out Detected] related to the ACR integral
value.
1.0
(0.1 - 2.0)
734
L8-53
(0473)
Expert
STPo Integration Time
Sets the length of time until the drive detects STPo after it is more than the value of L8-
51 [STPo I Detection Level].
1.0 s
(1.0 - 10.0 s)
734
L8-54
(0474)
Expert
STPo Id Diff Detection
Sets the Id deviation detection function for STPo [Motor Step-Out Detected].
0 : Disabled
1 : Enabled
1
(0, 1)
734
L8-55
(045F)
Internal DB
TransistorProtection
Sets the protection function for the internal braking transistor.
0 : Disable
1 : Protection Enabled
1
(0, 1)
735
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