YASKAWA OYMC V1000

1.8 L: Protection Functions
188 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
Setting 4: PM Derated Torque Motor
This setting is for operating a PM motor. PM motors for derated torque have a self-cooling
design, so the overload tolerance drops as the motor slows. Electrothermal operation is
triggered in accordance with the motor overload characteristics, providing overheat
protection across the entire speed range.
Note: Select a method to protect the motor from overheat by setting L1-01
between 1 and 4 when running a single motor from the drive. An external
thermal relay is not needed.
■ 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.
• Figure 1.74 shows an example of the electrothermal protection operation time using a
general-purpose motor operating at 60 Hz with L1-02 set to one minute.
Overload Tolerance Overload Characteristics Cooling Ability
Pico motor is designed with
a heatsink running from the
flange to the enclosure. PM
motors for derated torque
have the most effective
cooling design.
Because this motor is
designed for derated torque
applications, the load needs
to be limited at low speeds.
No. Name Setting Range Default
L1-02 Motor Overload Protection Time 0.1 to 5.0 min 1.0 min
150
continuous
rating
60 s momentary
rating
Motor Speed (%)
10 33 100
QWVRWV
HTGSWGPE[
120
100
80
50
0.0
(%)
Torque