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Maximum Allowable Power Loss Time Mem Addr: 060CH(41549)
Range: 0.3 to 5.0 sec Default Setting: 2.0
• During a power loss, if the power loss time is less than the time defined by this
parameter, the AC drive will resume operation. If the Maximum Allowable
Power Loss Time is exceeded, the AC drive output is turned off.
Base-Block Time for Speed Search Mem Addr 060DH(41550)
Range: 0.3 to 5.0 sec Default Setting: 0.5
• When a momentary power loss is detected, the AC drive turns off for a specified
time interval determined by 6-13 before resuming operation. This time interval is
called Base-Block. This parameter should be set to a value where the residual
output voltage due to regeneration is nearly zero, before the drive resumes
operation.
• This parameter also determines the searching time when performing external Base-
Block and Fault Reset (6-01)
Maximum Speed Search Current Level Mem Addr 060EH(41551)
Range: 30 to 200% Default Setting: 150
• Following a power failure, the AC drive will start its speed search operation only if
the output current is greater than the value determined by 6-14. When the output
current is less than that of 6-14, the AC drive output frequency is at a "speed
synchronization point". The drive will start to accelerate or decelerate back to the
operating frequency at which it was running prior to the power failure.
6-14
6-13
6-12
Chapter 4: AC Drive Parameters
GS1 Series AC Drive User Manual
4–42
Input
Power
Output
Frequency
Output
Voltage
Speed Search starts with
the Master Frequency
Max. Allowable Power Loss Time
Speed Search
speed synchronization
detection
Baseblock
Time
6-12
6-02 = 1
6-13
Speed Search starts w ith
Minimum Output Frequency
Baseblock
Time
Max. Allowable Power Loss Time
6-12
6-02 = 2
6-13