Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061753C GA500 Technical Manual 735
■ L8-55: Internal DB TransistorProtection
No.
(Hex.)
Name Description
Default
(Range)
L8-55
(045F)
Internal DB
TransistorProtection
Sets the protection function for the internal braking transistor.
1
(0, 1)
0 : Disable
Disables braking transistor protection.
Use this setting, if enabling the braking transistor can cause an rF [Braking Resistor Fault] in these conditions:
• With a regenerative converter, for example D1000.
• With a regenerative unit, for example R1000.
• When connecting braking resistor options to the drive, for example CDBR units.
• Without an internal braking transistor.
1 : Protection Enabled
Protects internal braking transistor when using a braking transistor or optional braking resistors.
■ L8-56: Stall P @ Accel Activation Time
No.
(Hex.)
Name Description
Default
(Range)
L8-56
(047D)
Expert
Stall P @ Accel Activation
Time
Sets the length time that the acceleration stall prevention function can continue to operate before
the drive detects an STPo [Motor Step-Out Detected].
5000 ms
(100 - 5000 ms)
Note:
If this value is too small, it can cause incorrect detection of STPo. If this value is too large, the drive will not detect STPo.
■ L8-57: Stall Prevention Retry Counts
No.
(Hex.)
Name Description
Default
(Range)
L8-57
(047E)
Expert
Stall Prevention Retry
Counts
Sets the number of times the acceleration stall prevention function can operate until speeds agree
before the drive detects an STPo [Motor Step-Out Detected].
10
(1 - 10 times)
Note:
If this value is too small, it can cause incorrect detection of STPo. If this value is too large, the drive will not detect STPo.
■ L8-90: STPo Detection Level (Low Speed)
No.
(Hex.)
Name Description
Default
(Range)
L8-90
(0175)
Expert
STPo Detection Level (Low
Speed)
Sets the detection level that the control fault must be equal to or more than to cause an STPo
[Motor Step-Out Detected].
Determined by A1-02
(0 - 5000 times)
This function detects when PM motors are not synchronized.
The drive cannot detect when motors are not synchronized because the frequency reference is low during start up
and the motor is locked. If fault detection is necessary in these conditions, set the control fault detection level to
enable detection of desynchronization because of motor locking. Increase the setting in 5-unit increments.
■ L8-93: Low Speed Pull-out DetectionTime
No.
(Hex.)
Name Description
Default
(Range)
L8-93
(073C)
Expert
Low Speed Pull-out
DetectionTime
Sets the length of time the drive will wait to start baseblock after detecting LSo [Low Speed Motor
Step-Out].
1.0 s
(0.0 - 10.0 s)
Set this parameter to 0.0 to disable the function.
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