YASKAWA U1000 Technical Manual

Setting 1: Enabled
A delay time of 64 ms is added to allow the torque limit to build at start.
u
L8: Drive Protection
n
L8-02: Overheat Alarm Level
Sets the overheat alarm (oH) detection level.
The drive outputs an alarm when the heatsink temperature exceeds the overheat alarm level. If the temperature reaches the
overheat fault level, the drive will trigger an oH1 fault and stop operation.
When an output terminal is set for the oH pre-alarm (H2-oo = 20), the switch will close when the heatsink temperature rises
above L8-02.
No. Name Setting Range Default
L8-02 Overheat Alarm Level 50 to 150 °C
Determined by
C6-01 and o2-04
n
L8-03: Overheat Pre-Alarm Operation Selection
Sets the operation when an overheat pre-alarm is detected.
Note: Change L8-03 setting only when necessary.
No. Name Setting Range Default
L8-03 Overheat Pre-Alarm Operation Selection 0 to 4 3
Setting 0: Ramp to Stop
If an overheat alarm occurs, the drive decelerates to stop using the currently selected deceleration time. If a digital output is
programmed for “fault” (H2-oo = E), this output will be triggered.
Setting 1: Coast to Stop
If an overheat alarm occurs, the drive switches off the output and the motor coasts to stop. If a digital output is programmed
for “fault” (H2-oo = E), this output will be triggered.
Setting 2: Fast Stop
If an overheat alarm occurs, the drive decelerates to stop using the Fast Stop time (C1-09). If a digital output is programmed
for “fault” (H2-oo = E), this output will be triggered.
Setting 3: Alarm Only
If an overheat alarm occurs, an alarm is output and the drive continues operation.
Setting 4: Operation with Reduced Speed
If an overheat alarm occurs, the operation continues with the speed reduced to the level set to parameter L8-19. If the oH alarm
is still present after 10 s, the speed is reduced again. The amount of speed reduction depends on how often the alarm repeats.
If the oH alarm disappears while the drive is operating at a reduced speed, the drive will switch to the previous speed in 10 s
increments until reaching base frequency. Figure 5.102 explains the operation with reduced speed during an oH alarm. A
digital output programmed for 4D is switched when the oH alarm is still active after ten reduction cycles.
5.8 L: Protection Functions
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YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual

YASKAWA U1000 Specifications

General

Category	Controller
Series	U1000
Input Frequency	50/60 Hz
Control Method	Vector control, V/f control
Overload Capacity	150% for 60 seconds
Output Voltage	0 to rated input voltage
Output Frequency	0-400Hz
Protection Functions	Overcurrent, Overvoltage, Undervoltage
Communication Protocols	Ethernet/IP, Modbus, CANopen
Cooling Method	Forced air cooling
Ambient Temperature	-10 to 50 °C
Operating Temperature	-10 to 50 °C
Storage Temperature	-20 °C
Humidity	5-95% (non-condensing)
Enclosure	IP20