YASKAWA A1000 Technical Manual

5.8 L: Protection Functions
296 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
 L8-03: Overheat Pre-Alarm Operation Selection
Sets the operation when an overheat pre-alarm is detected.
Note: Change settings only when necessary.
Setting 0: Ramp to stop
If an overheat alarm occurs, the drive decelerates to stop using the deceleration time currently selected. If a digital output
is programmed for “fault” (H2- = E), this output will be triggered.
Setting 1: Coast to stop
If heatsink overheat (oH) occurs, the drive switches off the output and the motor coasts to stop. If a digital output is
programmed for “fault” (H2- = 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- = 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 is continued but the speed is reduced to the level set in parameter L8-19. If
after 10 s the oH alarm is still present, the speed is reduced once more. The amount of reduction depends on how often
the alarm repeats. If the oH alarm disappears while the drive is operating at a reduced speed, then the drive will switch
back to the previous speed it was reduced to before. Figure 5.109 explains the operation with re
duced speed during an
oH alarm. A digital output programmed for 4D is switched when the oH alarm is still
active after ten reduction cycles.
Figure 5.109
Figure 5.109 Output Frequency Reduction During Overheat Alarm
 L8-19: Frequency Reduction Rate during Overheat Pre-Alarm
Specifies how much the output frequency is reduced when L8-03 is set to 4 and an oH alarm is present.
No. Name Setting Range Default
L8-03 Overheat Pre-Alarm Operation Selection 0 to 4 3
No. Name Setting Range Default
L8-19 Frequency Reduction Rate During Overheat Pre-Alarm 0.1 to 0.9 0.8
10 s
etc.
time
10 s 10 s 10 s 10 s 10 s 10 s
f
ref
× (L8-19)
f
ref
× (L8-19)
2
f
ref
× (L8-19)
4
f
ref
× (L8-19)
3
f
ref
Output frequency
Reset oH
Alarm
Reset oH
Alarm
Digital output (4D)
oH
Alarm
oH
Alarm
oH
Alarm
oH
Alarm
oH alarm number

YASKAWA A1000 Specifications

General

Type	AC Drive
Series	A1000
Input Voltage	200-240V, 380-480V
Frequency Range	0-400 Hz
Horsepower Range	0.5 to 1000 HP
Power Range	0.4 to 630 kW
Control Method	V/f Control
Overload Capacity	150% for 60 seconds
Braking	Dynamic Braking
Communication	Modbus
Safety	Safe Torque Off (STO)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overheat
Operating Temperature	-10 to +50°C
Storage Temperature	-20 to 60°C
Humidity	5 to 95% RH (non-condensing)
Enclosure	IP20