Parameter List
10
10.11 L: Protection Functions
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 519
No.
(Hex.)
Name Description
Default
(Range)
Ref.
L8-08
(04B4)
Output Phase Loss
Detection Lvl
Sets the output phase loss detection level.
5.0%
(0.0 - 20.0%)
764
L8-09
(04B5)
Output Ground Fault
Detection
Sets the function to enable and disable ground fault protection.
0 : Disabled
1 : Enabled
Determined by o2-04
(0, 1)
764
L8-10
(04B6)
Heatsink Fan Operation
Selection
Sets operation of the heatsink cooling fan.
0 : During Run, w/ L8-11 Off-Delay
1 : Always On
2 : Temperature-Dependent Fan Ctrl.
0
(0 - 2)
764
L8-11
(04B7)
Heatsink Fan Off-Delay
Time
Sets the length of time that the drive will wait before it stops the cooling fan after it
cancels the Run command when L8-10 = 0 [Heatsink Fan Operation Selection =
During Run, w/ L8-11 Off-Delay].
60 s
(0 - 300 s)
765
L8-12
(04B8)
Ambient Temperature
Setting
Sets the ambient temperature of the drive installation area.
40 °C
(-10 °C - +50 °C)
765
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)
765
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)
765
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)
765
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)
766
L8-35
(04EC)
Installation Method
Selection
Sets the type of drive installation.
0 : IP20/Open-Chassis enclosure
1 : Side-by-Side Mounting
2 : IP21/NEMA Type 1/IP55
3 : External Heatsink
Determined by the drive
(0 - 3)
766
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
and o2-04
(0 - 2)
766
L8-39
(04F0)
Carrier Freq Reduction
during oL
Sets the low carrier frequency when IGBT protection is enabled.
Determined by o2-04
(1.0 - 15.0 kHz)
767
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)
767
L8-41
(04F2)
High Current Alarm
Selection
Triggers an HCA [Current Alarm] when the output current exceeds 150% of the drive
rated current.
0 : Disable
1 : Enabled
1
(0, 1)
767
L8-55
(045F)
Internal DB
TransistorProtection
Sets the protection function for the internal braking transistor.
0 : Disable
1 : Protection Enabled
1
(0, 1)
767
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