Amtech Axpert-Eazy Series Instruction Manual page 101

To restart after coast to stop, confirm that the motor has stopped. The AC DRIVE may trip if attempted
when the motor is running. (Enable the speed search function in such applications.)
A305: Motor Direction
This parameter allows the user to set the motor direction, when Start control selection is local (Digital
Operation Panel) A301=1. Set A305=0, to rotate the motor in forward direction and A305=1 to rotate
the motor in reverse direction in Local mode.
When A301=2: Terminal, the direction of rotation is determined by the status of programmable
sequence input.
Set B308 to prevent unintentional reverse direction operation. It will prevent the unit to start in reverse
direction, when enabled. This parameter cannot be changed during running condition.
Note: If reverse direction is locked and run command is given with reverse direction selection, the unit will not
start in reverse direction.
A306: DC Brake Start Frequency (Hz)
This is the frequency at which the dc brake will be applied. To enable this feature, the stop mode
should be ramp down and the dc braking time should not be zero. If dc braking time is zero, this
feature will be disabled.
A307: DC Brake Current (%) 6
This parameter decides the dc brake current.
A308: DC Brake Time (Sec)
This parameter decides the length of time for which dc braking is on.
When the stop mode is ramp down and stop command is issued, the output will ramp down with
deceleration time. When the AC DRIVE output reaches to dc braking start frequency, the dc voltage is
injected to the motor. The amount of voltage and the length of time for which it is applied are decided
by the dc braking current A307 and A308 respectively.
The dc braking is utilized to stop high inertia load forcefully. During dc braking mechanical energy
trapped in rotor due to system inertia will be dissipated as heat in the motor. Hence for safety dc
breaking is utilized at lower frequency.
A309: Stall Current Limit Selection
This parameter provides the choice for the selection of the stall current limit either from Local or
Terminal.
When the stall current limit selection is Local, the stall limit comes from the parameter B301 and if
selection is terminal then comes from analog input VIN (0-10V). It's range from 0 to 200% according
to 0-10V at VIN.
A310: Auto Start / Line Start
A310 = 1: (OFF) Starts (Runs) with the start (run) command ON after pre-charging.
A310 = 2: (ON without Speed Search) If the start (run) command is ON when the power is turned on,
run will start after the inverter is charged. Speed search is not executed with this setting, so if the
motor is rotating when the power is turned ON, the inverter operation could trip.
A310 = 3: (ON with Speed Search) If the start (run) command turns ON when the power turns ON,
Speed search will start when the inverter charging is completed, and then operation will start.
If auto start (A310 = 2, 3) is used, under voltage fault will not be detected
This function is not applicable, if start control either local or serial.
Axpert-Eazy AC Variable Frequency Drive
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