5.8 L: Protection Functions
■ L4-05: Speed Reference Loss Detection Selection
The drive can detect a loss of an analog speed reference from input A1 and A2. Speed reference loss is detected when the
speed reference falls below 10% o f the previous reference, or below 5% o f the maximum output frequency within 400
ms.
Analog
speed
reference --------------------
400 ms
F ig u r e 5 .3 5 L o s s o f R e f e r e n c e F u n c tio n
Parameter L4-05 selects the operation when a speed reference loss is detected.
No.
Name
Setting Range
Default
L4-05
Speed Reference Loss Detection Selection
0 or 1
0
Setting 0: Stop
Drive follows the speed reference (which is no longer present) and simply stops the motor.
Setting 1: Continue operation with reduced speed reference
The drive will continue the operation at the speed reference value set in parameter L4-06. When the external speed
reference value is restored, the operation is continued with the external speed reference.
■ L4-06: Speed Reference at Reference Loss
Sets the speed reference level the drive runs with when L4-05 = 1 and a reference loss was detected. The value is set as a
percentage of the speed reference before the loss was detected.
No.
Name
Setting Range
Default
L4-06
Speed Reference at Reference Loss
0.0 to 100.0%
80.0%
■ L4-13: Door Zone Level
Sets the speed level for the car door to open. Once the car slows to the speed set in L4-13, a multi-function output
terminal set for “Door zone reached” will close (H2-DD = 52).
No.
Name
Setting Range
Default
L4-13
Door Zone Level
0.0 to 100.0%
0.0%
♦ L5: Automatic Fault Reset
After a fault has occurred, Fault Restart attempts to automatically restart the motor and continue operation instead of
stopping. The inverter can reset faults automatically. The maximum number o f resets can be selected as well as the
operation mode of the fault relay.
W ARNING!
S ud de n M o v e m e n t H azard. D o n o t u se the fa u lt re s e t fu n ctio n in liftin g applicatio ns. F a u lt re s e t m a y ca u se the m a c h in e to
dro p the load, w h ich c o u ld re s u lt in de a th o r s e rio u s injury.
Faults Allowing for Automatic R e s e t
The drive attempts to reset itself after one o f the faults listed below has occurred. All other faults will need to be reset
externally.
Fault
Name
Fault
Name
GF
Ground Fault
ov
DC Bus Overvoltage
LF
Output Phase Loss
rr
Braking Transistor Fault
oC
Overcurrent
UL3
Undertorque Detection 1
oH1
Heatsink Overheat
UL4
Undertorque Detection 2
oL1
Motor Overload
SE1
Sequence Error 1
oL2
Drive Overload
SE2
Sequence Error 2
oL3
Overtorque Detection 1
SE3
Sequence Error 3
oL4
Overtorque Detection 2
-
-
10%
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
