Amtech
6-90
6
C503: Emergency Stop mode
Set the stopping method for the emergency stop from the following options.
1. Coast to stop without fault output
2. Coast to stop with fault output
3. Ramp down to stop
C504: Speed Search selection
C505: Speed Search Current Limit (%)
C506: Speed Search Frequency Deceleration time (Sec)
C507: Speed Search Voltage Acceleration time (Sec)
C508: Speed Search Wait Time (Sec)
Speed search operation is useful to start the coasting motor or AC DRIVE changeover operation
without tripping. When selected, the AC DRIVE starts speed search from the maximum frequency.
The operation starts after the speed search wait time C508 after the start command. The following
figure explains the sequence of operation.
Speed search current limit C505 is applicable only during the speed search operation. The output
frequency deceleration time and output voltage acceleration time during the SSF can be adjusted
using C506 and C507 respectively as per the application.
C509: PLCT Time (Sec)
Power Loss Carry Through is a function that allows the AC DRIVE to run trip-less during the short-
term power outage / under voltage. As soon as the power outage / under voltage is detected, the AC
DRIVE output is turned OFF. If the supply resumes before the programmed time in C509, the AC
DRIVE will start with the speed search operation and reach to the set frequency. The fault relay will
not be enabled during this process nor the under voltage fault displayed on the operation panel.
However, if the power outage or under voltage condition persists for longer time than the programmed
time, the AC DRIVE will trip indicating under voltage fault. When programmed to 0, the PLCT feature
is disabled.
Note: The time in C509 must be less than the time for which the control power supply remains stable during the
power outage or under voltage condition.
C510: Speed Search Match Current Limit (%)
Speed search match current limit function limit drive current when speed match with actual motor
speed. Not usually necessary to set. When restarting is not possible with the factory settings, set the
value.
C511: Speed Search Match Frequency Gain
Set gain to increase the frequency after speed detect for speed search function.
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