YASKAWA GA700 Technical Manual page 222

4.3 UL Standards
■
L1-02: Motor Overload Protection Time
No.
Name
(Hex.)
L1-02 Motor Overload
(oL1) Protection
(0481)
Set the overload tolerance time to the length of time that the motor is allowed to operate at 150% load from
continuous operation at 100% load.
The default setting triggers the electronic thermal protector after the motor operates at 150% load continuously for
1 minute after continuous operation at 100% load (hot start).
The following diagram is 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 4.16 Protection Operation Time for a General-purpose Motor at Rated Output Frequency
■
L1-03: Motor OH Alarm Operation Select
No.
Name
(Hex.)
L1-03 Motor OH Alarm
Operation Select
(0482)
0 : Ramp to stop
The drive ramps the motor to stop according to the deceleration time. Fault relay output terminal MA-MC will
turn on, and MB-MC will turn off.
1 : Coast to stop
The drive shuts off output and the motor coasts to stop. Fault relay output terminal MA-MC will turn on, and MB-
MC will turn off.
2 : Fast Stop
The drive stops the motor using the deceleration time set in C1-09 [Fast Stop Time]. Fault relay output terminal
MA-MC will turn on, and MB-MC will turn off.
3 : Alarm only
oH3 appears on the keypad, and operation continues.
222
V/f CL-V/f OLV CLV AOLV
Sets the operation time for the electronic thermal protector of the drive to
protect the motor. Normally there is no need to change this setting.
V/f CL-V/f OLV CLV AOLV
Selects the drive operation when the PTC input signal input into the drive
reaches the detection level of oH3 [Motor Overheat Alarm].
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default Setting
(Range)
1.0 min
(0.1 - 5.0 min)
Default Setting
(Range)
3
(0 - 3)