358
YASKAWA
TOMPYEULA7002A LA700 Series Installation and Operation Instruction
When the motor operates at 150% load continuously for 1 minute after continuous operation at 100% load (hot
start), the default setting triggers the electronic thermal protector.
shows an example of the electronic thermal protector operation time. Motor overload protection
operates in the range between a cold start and a hot start.
This example shows a general-purpose motor operating at the base frequency with
L1-02
set to 1.0 min.
•
Cold start
Shows the motor protection operation time characteristics when the overload occurs immediately after starting
operation from a complete stop.
•
Hot start
Shows the motor protection operation time characteristics when overload occurs from continuous operation
below the motor rated current.
Figure 10.5 Protection Operation Time for a General-purpose Motor at Rated Output Speed
L1-03: Motor Thermistor oH Alarm Select
No.
(Hex.)
Name
Description
Default
(Range)
L1-03
(0482)
Expert
Motor Thermistor oH
Alarm Select
Sets drive operation when the PTC input signal entered into the drive is at the
oH3 [Motor
Overheat Alarm]
detection level.
3
(0 - 3)
0 : Ramp to Stop
The drive ramps the motor to stop in the deceleration ramp. Fault relay output terminal MA-MC turns ON, and
MB-MC turns OFF.
1 : Coast to Stop
The output turns off and the motor coasts to stop. Fault relay output terminal MA-MC turns ON, and MB-MC
turns OFF.
2 : Emergency Stop (Use C1-09)
The drive stops the motor in the deceleration ramp set in
C1-09 [Emergency Stop Ramp]
. Fault relay output
terminal MA-MC turns ON, and MB-MC turns OFF.
3 : Alarm Only
The keypad shows
oH3
and the drive continues operation. The output terminal set for
Alarm [H2-01 to H2-05 =
10]
activates.
L1-04: Motor Thermistor oH Fault Select
No.
(Hex.)
Name
Description
Default
(Range)
L1-04
(0483)
Expert
Motor Thermistor oH Fault
Select
Sets the drive operation when the PTC input signal to the drive is at the
oH4 [Motor Overheat
Fault (PTC Input)]
detection level.
1
(0 - 2)
0 : Ramp to Stop
The drive ramps the motor to stop in the deceleration ramp. Fault relay output terminal MA-MC turns ON, and
MB-MC turns OFF.
1 : Coast to Stop
V/f
OLV
CLV
CLV/PM
V/f
OLV
CLV
CLV/PM