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Advanced Operation
7.3.6 Protective Functions: L
- 58
Inverter Overheating (OH) Pre-alarm Settings: L8-02 L8-03
User
Change
during
Setting
Factory
Valid Access Levels
User
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting
Open Loop
Vector
Flux Vector
L8-02
Overheat pre-alarm lev-
el
50 to 110
95
A
A
L8-03
Operation selection after
overheat pre-alarm
0 to 3
--
3
A
A
D
Constant L8-02 specifies the detection temperature in
q
C for the Inverter overheat (OH) pre-alarm
function. An overheat pre-alarm occurs when the temperature of the cooling fins reaches this level.
D
Constant L8-03 specifies the processing that will be performed when an overheat pre-alarm occurs.
Apart from this setting, cooling fin overheating (OH1) is detected as a protection function at 105
_
C.
D
Settings
Setting
Function
0
Decelerates to a stop in the deceleration time set in C1-09. (Protection operation: Fault contacts
operate)
1
Coast to stop. (Protection operation: Fault contacts operate)
2
Emergency stop in the emergency-stop time set in C1-09. (Protection operation: Fault contacts
operate)
3
Continues operation. (Alarm: Monitor display only.)
Input Open-phase Protection Selection: L8-05
User
Change
during
Setting
Factory
Valid Access Levels
User
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting
Open Loop
Vector
Flux Vector
L8-05
Input open-phase
protection selection
0 1
--
0
A
A
D
This function detects changes in the main circuit DC voltage which indicate a power supply open-
phase, large imbalance in the power supply voltage, or deterioration of the main circuit capacitor.
D
Settings
Setting
Function
0
Disabled.
1
Enabled. (Detects input power supply open-phase, 3-phase imbalance, or deterioration of the
main circuit capacitor.)
Output Open-phase Protection Selection: L8-07
D
This function detects an Inverter output open-phase.
User
Change
during
Setting
Factory
Valid Access Levels
User
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting
Open Loop
Vector
Flux Vector
L8-07
Output open-phase
protection selection
0 1
--
0
A
A
D
Settings
Setting
Function
0
Disabled.
1
Enabled. (Detects an output open-phase at under 10% of the Inverter’s rated output current.)
D
False open-phase detections may occur when the motor capacity is small compared to the Inverter ca-
pacity. In this case, disable the detection function by setting L8-07 to 0.
7