Yaskawa AC Drive P1000 Bypass Technical Manual - Manual (Page 127)

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. Name Setting Range Default
L1-02 Motor Overload Protection Time 0.1 to 5.0 minutes 1.0 minutes
Defaulted to operate with an allowance of 150% overload operation for one minute in a hot start after continuous operation
at 100%.
Figure 5.31 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)
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 (%)
E2-01 = 100% motor current
10
7
3
1
0.4
0.1
0 100 150 200
Figure 5.31 Protection Operation Time for General Purpose Motors at the Rated Output Frequency
u L2: Momentary Power Loss Ride-Thru
n L2-01: Momentary Power Loss Operation Selection
When a momentary power loss occurs (DC bus voltage falls below the level set in L2-05), the drive can automatically return
to the operation it was performing prior to the power loss based on certain conditions.
No. Name Setting Range Default
L2-01 Momentary Power Loss Operation Selection 0 to 2 2
Setting 0: Disabled
If power is not restored within 15 ms, a Uv1 fault will result and the motor coasts to stop.
Setting 1: Recover within L2-02
When a momentary power loss occurs, the drive output will be shut off. If the power returns within the time set to parameter
L2-02, the drive will perform Speed Search and attempt to resume operation. If the power does not return within this time, it
will trigger a Uv1 fault.
Note: L2-02 value is dependent on drive model selection and is not accessible.
Setting 2: Recover as long as CPU Has Power
When a momentary power loss occurs, the drive output will be shut off. If the power returns and the drive control circuit has
power, the drive will attempt to perform Speed Search and resume the operation. This will not trigger a Uv1 fault.
Notes on Settings 1 and 2
• “Uv” will flash on the operator while the drive is attempting to recover from a momentary power loss. A fault signal is not
output at this time.
5.8 L: Protection Functions
YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual 127
5
Programming