L: Protection Function; L: Protection Function; L1: Motor Protection; L2: Momentary Power Loss Ride-Thru - YASKAWA P1000 Technical Manual

B.9 L: Protection Function
B.9 L: Protection Function
L parameters provide protection to the drive and motor, including control during momentary power loss, stall prevention,
frequency detection, fault restarts, overtorque and undertorque detection, and other types of hardware protection.
u

L1: Motor Protection

No.
(Addr. Name
Hex)
L1-01 Motor Overload Protection
(480) Selection
L1-02 Motor Overload Protection
(481) Time
u

L2: Momentary Power Loss Ride-Thru

No.
(Addr. Name
Hex)
L2-01 Momentary Power Loss
(485) Operation Selection
L2-02 Momentary Power Loss
(486) Ride-Thru Time
L2-03 Momentary Power Loss
(487) Minimum Baseblock Time
L2-05 Undervoltage Detection
(489) Level (Uv1)
<1> Default is 0 in bypass controller software versions VST800297 and earlier.
<2> Default setting is dependent on parameter o2-04, Drive Model Selection.
<3> Default setting is dependent on parameters o2-04, Drive Model Selection, and E1-01, Input Voltage Setting.
<4> Values shown are specific to 208 Vac. Double the value for 480 Vac.
u

L3: Stall Prevention

No.
(Addr. Name
Hex)
L3-02 Stall Prevention Level
(490) during Acceleration
L3-03 Stall Prevention Limit
(491) during Acceleration
266
0: Disabled
1: General purpose motor (standard fan cooled)
The drive may not be able to provide protection when using multiple motors,
even if overload is enabled in L1-01. Set L1-01 to 0 and install separate thermal
relays to each motor.
Sets the motor thermal overload protection (oL1) time.
0: Disabled.
Drive trips on Uv1 fault when power is lost.
1: Recover within the time set in L2-02.
Uv1 will be detected if power loss is longer than L2-02.
Note: L2-02 is dependent on drive model selection and is not
accessible.
2: Recover as long as CPU has power.
Uv1 is not detected.
Sets the Power Loss Ride-Thru time. Enabled only when L2-01 = 1 or 3.
Sets the minimum wait time for residual motor voltage decay before the drive
output reenergizes after performing Power Loss Ride-Thru.
Increasing the time set to L2-03 may help if overcurrent or overvoltage occur
during Speed Search or during DC Injection Braking.
Sets the DC bus undervoltage trip level.
Used when L3-01 = 1 or 2. 100% is equal to the drive rated current.
Sets Stall Prevention lower limit during acceleration when operating in the
constant power range. Set as a percentage of drive rated current.
YASKAWA SIEP YAIP1B 01B YASKAWA AC Drive – P1000 Bypass Technical Manual
Description
Description
Description
Values Page
Default: 1
134
Range: 0, 1
Default: 1.0 min
Min.: 0.1 135
Max.: 5.0
Values Page
<1>
Default: 2
135
Range: 0 to 2
<2>
Default:
136
Min.: 0.0 s
Max.: 25.5 s
<2>
Default:
136
Min.: 0.1 s
Max.: 5.0 s
Default: 190 Vdc
<3> <4>
136
Min.: 150 Vdc
<4>
Max.: 220 Vdc
Values Page
Default: 120%
Min.: 0
136
<1>
Max.: 120
Default: 50%
Min.: 0 137
Max.: 100