11.11 L: Protection Functions
556 YASKAWA SIEPC71061705H GA700 Series Technical Manual
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)
912
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)
912
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)
912
L8-20
(04C0)
Expert
Control Fault & Step Out
Detect
Sets operation after the drive detects a CF fault when A1-02 = 4 [Control Method
Selection = Advanced Open Loop Vector].
0 : Disabled
1 : CF/STPo Detection Enabled
2 : CF ALM/Stop
1
(0 - 2)
913
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%)
913
L8-29
(04DF)
Output Unbalance
Detection Sel
Sets the function to detect LF2 [Output Current Imbalance].
0 : Disabled
1 : Enabled
1
(0, 1)
913
L8-31
(04E1)
LF2 Detection Time
Sets the LF2 [Output Current Imbalance] detection time.
3
(1 – 100)
913
L8-32
(04E2)
Cooling Fan Failure
Selection
Sets operation when the drive detects FAn [Internal Fan Fault].
0 : Ramp to Stop
1 : Coast to Stop
2 : Fast Stop (Use C1-09)
3 : Alarm Only
4 : Operate at Reduced Speed (L8-19)
1
(0 - 4)
914
L8-35
(04EC)
Installation Method
Selection
Sets the type of drive installation.
0 : IP20/UL Open Type/Ex Heatsink
1 : Side-by-Side Mounting
2 : IP20/UL Type 1
3 : Finless
Determined by the drive
(0 - 3)
444
L8-38
(04EF)
Carrier Frequency
Reduction
Sets the carrier frequency reduction function. The drive reduces the carrier frequency
when the output current is more than a specified level.
0 : Disabled
1 : Enabled below 6 Hz
2 : Enabled for All Speeds
Determined by A1-02,
C6-01 and o2-04
(0 - 2)
915
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)
915
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 : Disabled
1 : Enabled
0
(0, 1)
915
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