YASKAWA VS-606V7 Series Instruction Manual page 88

• General-purpose motor and inverter motor
Induction motors are classified as general-purpose motors or inverter
motors, based on their cooling capabilities. Therefore, the motor overload
function operates differently between these two motor types.
Cooling Effect
Effective when
operated at
50/60Hz from
commercial
power supply.
Effective even
when operated at
low speed
(approx. 6Hz)
88
Example of 200V class motor
Torque Characteristics
180
60 SEC
155
SHORT-TERM
140
TORQUE
100
(%)
80
55
38
0
3 20 60
OPERATION FREQUENCY (Hz)
Base Frequency 60Hz
(V/f for 60Hz, 220V Input Voltage)
For low-speed operation, torque
must be limited in order to stop
motor temperature rise.
180
60 SEC
SHORT-TERM
150
TORQUE
100
(%)
55
38
0
6 60
OPERATION FREQUENCY (Hz)
Base Frequency 60Hz
(V/f for 60Hz, 220V Input Voltage)
Use an inverter motor for
continuous operation at low speed.
Electronic Thermal
overload
"OL 1 " error (motor
overload protection)
occurs when
CONTINUOUS
continuously
RATING
operated at 50/60Hz
or less at 100% load.
120
Electronic thermal
overload protection
not activated even
CONTINUOUS
when continuously
RATING
operated at 50/60Hz
or less at 100% load.
120