YASKAWA A1000 Series Technical Manual

5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual 269
Parameter Details
5
Setting 0: Disabled
Toque limit is created at start without a delay time. Disable L7-16 to maximize response time when the application
requires sudden acceleration or deceleration at start.
Setting 1: Enabled
A time filter is added to allow the torque limit to build at start.
◆ L8: Drive Protection
■ L8-01: Internal Dynamic Braking Resistor Protection Selection (ERF type)
This parameter selects the dynamic braking resistor protection when using an optional heatsink mounted braking resistor
(ERF type, 3% ED).
Setting 0: Disabled
Disables braking resistor protection. Use this setting for any dynamic braking option other than the Yaskawa ERF type
resistor.
Setting 1: Enabled
Enables protection for ERF type resistors.
■
L8-02: Overheat Alarm Level
Sets the overheat alarm (oH) detection level.
The drive will output an alarm when the heatsink temperature exceeds the alarm level set in parameter L8-02. If the
operation when this alarm occurs is set for continued operation (L8-03 = 4) and 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- = 20), the switch will close when the heatsink temperature
rises above L8-02.
■
L8-03: Overheat Pre-Alarm Operation Selection
Sets the operation when an overheat pre-alarm is detected.
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.
No. Name Setting Range Default
L8-01 Internal Dynamic Braking Resistor Protection Selection (ERF type) 0 or 1 0
No. Name Setting Range Default
L8-02 Overheat Alarm Level 50 to 150 °C
Determined by C6-01 and
o2-04
No. Name Setting Range Default
L8-03 Overheat Pre-Alarm Operation Selection 0 to 4 3

YASKAWA A1000 Series Specifications

General

Series	A1000
Type	AC Drive
Altitude	Up to 1000m without derating
Output Frequency	0-400 Hz
Control Method	V/f Control
Overload Capacity	150% for 60 seconds
Communication Options	Modbus, DeviceNet, Profibus, Ethernet/IP
Ambient Temperature	-10 to 50°C
Storage Temperature	-20 to 60°C
Humidity	5% to 95% (non-condensing)
Enclosure Rating	IP20
Horsepower	0.5 to 1000 HP
Power Range	0.4 - 630 kW (varies by voltage and model)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overheat
Cooling Method	Fan Cooled
Safety	Safe Torque Off (STO)