Yaskawa VS-626 MC5 - Manual (Page 196)

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 qC 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