L: Protection Function; L: Protection Function; L1: Motor Protection; L2: Momentary Power Loss Ride-Thru - YASKAWA Z1000 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.
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L1: Motor Protection

No.
(Addr. Name
Hex)
Motor Overload Protection
L1-01
Selection
(480)
Mtr OL Charact
Motor Overload Protection
L1-02
Time
(481)
MOL Time Const
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L2: Momentary Power Loss Ride-Thru

No.
(Addr. Name
Hex)
Momentary Power Loss
L2-01
Operation Selection
(485)
PwrL Selection
Momentary Power Loss
L2-02
Ride-Thru Time
(486)
PwrL Ridethru t
Momentary Power Loss
L2-03
Minimum Baseblock Time
(487)
PwrL Baseblock t
Undervoltage Detection
L2-05
Level (Uv1)
(489)
PUV Det Level
<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.
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L3: Stall Prevention

No.
(Addr. Name
Hex)
Stall Prevention Level
L3-02
during Acceleration
(490)
StallP Accel Lvl
Stall Prevention Limit
L3-03
during Acceleration
(491)
StallPAcc LowLim
328
0: Disabled
0: OL1 Disabled
1: General purpose motor
1: VT Motor
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.
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 ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
Description
(standard fan cooled)
Description
1: Enbl with Timer
2: Enbl whl CPU act
Description
Values Page
Default: 1
168
Range: 0, 1
Default: 1.0 min
Min.: 0.1 169
Max.: 5.0
Values Page
<1>
Default: 2
169
Range: 0 to 2
<2>
Default:
170
Min.: 0.0 s
Max.: 25.5 s
<2>
Default:
170
Min.: 0.1 s
Max.: 5.0 s
Default: 190 Vdc
<3> <4>
170
Min.: 150 Vdc
<4>
Max.: 220 Vdc
Values Page
<1>
Default:
Min.: 0% 170
<1>
Max.: 150%
Default: 50%
Min.: 0 171
Max.: 100