YASKAWA A1000 Series Technical Manual

5.8 L: Protection Functions
246 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Setting 5: Constant torque PM motors (constant torque range of 1:500)
Sets protection characteristics needed when driving a PM with constant torque. These motors allow for a speed control
from 0.2% to 100% when operating with 100% load. Slower speeds with 100% load will trigger overload.
Setting 6: General-purpose motor (50 Hz)
Because the motor (50 Hz) is self-cooled, the overload tolerance drops when the motor speed is lowered. The drive
appropriately adjusts the electrothermal trigger point according to the motor overload characteristics, protecting the
motor from overheat throughout the entire speed range.
■
L1-02: Motor Overload Protection Time
Sets the time it takes the drive to detect motor overheat due to overload. This setting rarely requires adjustment, but
should correlate with the motor overload tolerance protection time for performing a hot start.
Defaulted to operate with an allowance of 150% overload operation for one minute in a hot start.
• Figure 5.87 shows an example of the electrothermal protection operation time using a general-purpose motor
operating at 50 Hz with L1-02 set to one minute.
During normal operation, motor overload protection operates in the area between a cold start and a hot start.
• Cold start: Motor protection operation time in response to an overload situation that was suddenly reached when
starting a stationary motor.
• Hot start: Motor protection operation time in response to an overload situation that occurred during sustained
operation at rated current.
Overload Tolerance Cooling Ability Overload Characteristics
Motor is designed to effectively cool itself at ultra-
low speeds (about 0.2% of base speed).
Continuous operation with 100% load from 0.2% to
100% of base speed.
Overload Tolerance Cooling Ability Overload Characteristics
Motor designed to operate from line power.
Motor cooling is most effective when running at
rated base frequency (check the motor nameplate or
specifications).
Continuous operation at less than line power
frequency with 100% load can trigger motor
overload protection (oL1). A fault is output and the
motor will coast to stop.
No. Name Setting Range Default
L1-02 Motor Overload Protection Time 0.1 to 5.0 minutes 1.0 minutes
Percent of base speed (%)
0 0.2 100 130 150
150
100
115
77
67
Instantaneous rating (60 s)
125
83
120
Continuous
Torque (%)
A: Max. speed for 200LJ and above
B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
A
B
C
100 120 167 20005 33
Speed (%)
Torque (%)
Continuous
100
90
150
60 s
50
Rated Speed=100% Speed

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)