12.8 L: PROTECTION
802 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
■ L8-54 STPo Id Diff Detection
No.
(Hex.)
Name Description
Default
(Range)
L8-54
(0474)
Expert
STPo Id Diff Detection
Sets the Id deviation detection function for STPo [Desynchronization Error].
1
(0, 1)
0 : Disable
1 : Enabled
■ L8-55 DB IGBT Protection
No.
(Hex.)
Name Description
Default
(Range)
L8-55
(045F)
DB IGBT Protection
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 : Enabled
Prevents damage to the internal braking transistor when using a braking transistor or optional braking resistors.
These models have a built-in braking transistor:
• 4002 to 4168
■ L8-56 StallP@Acc Activation Time
No.
(Hex.)
Name Description
Default
(Range)
L8-56
(047D)
Expert
StallP@Acc Activation
Time
Sets the length time that the acceleration stall prevention function can continue to operate before
the drive detects an STPo [Desynchronization Error].
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 StallP Retry Counts
No.
(Hex.)
Name Description
Default
(Range)
L8-57
(047E)
Expert
StallP Retry Counts
Sets the number of times the acceleration stall prevention function can operate until speeds match
before the drive detects an STPo [Desynchronization Error].
10 times
(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 Detect Level
No.
(Hex.)
Name Description
Default
(Range)
L8-90
(0175)
Expert
STPo Detect Level
Sets the detection level that the control fault must be equal to or more than to cause an STPo
[Desynchronization Error].
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.
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