Page 4–136
DURApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Chapter 4: AC Drive Parameters
Type Hex Addr Dec Addr
P6.21 Over-Current Stall Prevention Level During Operation
♦R/W 0615 41558
Range/Units (Format: 16-bit unsigned) Default
If P6�34 = VT (light duty): 0~130% of drive rated current
If P6�34 = CT (normal duty): 0~160% of drive rated current
00 = Disable
VT: 120
CT: 120
During steady-state operation with motor load rapidly increasing, the GS4 drive output current
may exceed the limit specified in P6.21. If output current exceeds the setting specified in P6.21
when the drive is operating, the drive will decrease its output frequency (according to P6.36) to
prevent a motor stall. If the output current is lower than the setting specified in P6.21, the drive
will resume acceleration (according to P6.36) to catch up with the set frequency command value.
Over-current Stall Prevention
During Operation
P6.21
Output Frequency
Over-current stall prevention
during operation, output
frequency decreased
Over-current stall prevention during operation
Time
Current
P6.21 Setting
P6.21 setting rated
drive current x 5%
Decreased by
deceleration time
Related parameters: P6.34 VT/CT Duty Selection,
P6.36 OC Stall Prevention Accel/Decel Time Selection at Normal Speed
Type Hex Addr Dec Addr
P6.22 Maximum Allowable Power Loss Time
♦R/W 0616 41559
Range/Units (Format: 16-bit unsigned) Default
0�0~20�0 sec
2�0
If the duration of a power loss is less than this parameter setting, the GS4 drive will resume
operation. If it exceeds the Maximum Allowable Power Loss Time, the GS4 drive output is then
turned off (coast stop).
The selected operation after power loss in P6.08 is only executed when the maximum allowable
power loss time is ≤ 20 seconds and the GS4 drive displays “LU.” But if the GS4 drive is powered
off due to overload, even if the maximum allowable power loss time is ≤5 seconds, the operation
mode as set in P6.08 is not executed. In that case the drive starts up normally.
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