YASKAWA CIMR-VU BA0001 Technical Manual page 215

Overload Tolerance
150
Rated Speed=100% Speed
60 s
A: Max. speed for 200LJ and above
B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
100
90
60
Continuous
50
A
B
05 33 100 120 167 200
Speed (%)
n L1-02: Motor Overload Protection Time
Sets the time for the drive to shut down on motor overload (oL1) when the motor is running with excessive current. Enter the
time the motor can withstand operating at 150% current after previously running at 100% current (hot motor overload
condition). This parameter rarely requires adjustment.
No.
L1-02
Defaulted to operate with an allowance of 150% overload operation for one minute in a hot start after continuous operation
at 100%.
Figure 5.76 illustrates an example of the electrothermal protection operation time using a general-purpose motor operating at
the value of E1-06, Motor Base Speed, with L1-02 set to one minute.
Motor overload protection operates in the area between a cold start and a hot start.
• Cold start: Characteristics of motor protection operation time in response to an overload situation that was suddenly reached
when starting a stationary motor.
• Hot start: Characteristics of motor protection operation time in response to an overload situation that occurred while the
motor was operating continuously at or below its rated current.
Operation time (minutes)
Figure 5.76 Protection Operation Time for General Purpose Motors at the Rated Output Frequency
n Motor Protection Using a Positive Temperature Coefficient (PTC)
A motor PTC can be connected to an analog input of the drive. This input is used by the drive for motor overheat protection.
When the motor overheat alarm level is reached, an oH3 alarm will be triggered and the drive will continue operation as
selected in L1-03. When the overheat fault level is reached an oH4 fault is triggered, a fault signal will be output and the drive
will stop the motor using the stop method determined in L1-04.
Figure 5.77 shows a PTC connection example for analog input A2. If using analog input A2, make sure to set DIP switch S1
on the terminal board for voltage input when using this function.
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Motor designed to operate from line
power. Motor cooling is most effective
when running at rated base frequency
(check the motor nameplate or
specifications)
C
Name
Motor Overload Protection Time
10
7
3
1
0.4
0.1
0 100
Cooling Ability
Cold start
(characteristics when an
overload occurs at a
complete stop)
Hot start
(characteristics when an
overload occurs during
continuous operation at 100%)
Motor current (%)
150 200
E2-01 = 100% motor current
5.8 L: Protection Functions
Overload Characteristics
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.
Setting Range
0.1 to 5.0 minutes 1.0 minutes
Default
5
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