Toshiba VF-AS1 instruction manual E6581301

E6581301

Output frequency [Hz]

Set frequency

DC braking start frequency ￿￿￿￿

0 Output current [A]

0

Operation signal (F-CC)

Operation standby signal (ST-CC) (SW1 set to sink logic)

LED display

￿￿is displayed.

￿￿￿￿is displayed.

￿￿￿￿

Time [s]

￿￿￿￿

2

ON

OFF

ON

OFF

Note 1: If the motor shaft fixing control parameter ￿￿￿￿ is set at ￿ (enabled) when the output frequency is below the DC braking start frequency ￿￿￿￿ and terminals ST-CC are closed (ON), the DC braking function is activated and the motor shaft fixing control continues regardless of the setting of the DC braking time parameter ￿￿￿￿.

Note 2: If a power failure occurs during motor shaft fixing control and the motor starts to a coast, motor shaft fixing control will be canceled. Also, if the inverter trips during motor shaft fixing control and is restored to working order by the retry function, motor shaft fixing control will be canceled.

6.8.3Function of issuing a 0Hz command during a halt!

￿￿￿￿￿: 0Hz command output selection

• Function

This function controls the motor in the zero-speed state at the time of stop. If this function is set up, the 0Hz command will be put out instead of DC braking at the time of a stop,and a motor will be controlled in the setting time stop state. The monitor display serves as ￿￿ during this control operation. This function operates only at the time of vector control with a sensor (￿￿=￿, ￿).

Refer to DC braking (Section 6.8.1) for conditions of operation. The position of DC braking is served as an operation which sets the operation frequency command to 0Hz.

[Parameter setting]

Title!	Function!	Adjustment range!	Default setting!
￿￿￿￿!	0Hz command output selection!	￿: Standard (DC braking)!	￿
		￿: 0Hz command!
￿￿￿￿!	DC braking starting frequency!	￿￿~￿￿￿￿￿ Hz!	￿￿
￿￿￿￿!	DC braking time!	￿￿~￿￿￿ sec.!	￿￿

Note 1: This function doesn't operate when ￿￿￿￿=￿￿.

Note 2: If this function is set up, motor shaft fixing control ￿￿￿￿ cannot be used.

Note 3: This function doesn't operate at the time of a torque control.

6

Note 4: This function doesn't operate except ￿￿=￿, ￿ of the vector control mode with a sensor. In order to use this function, the option board for PG feedback is required. When expect vector control with a sensor ￿￿=￿, ￿, this function operate as DC braking mode (It is the same as ￿￿￿￿=￿ setting).

Note 5: Since the reference frequency that will suspend the motor abruptly from the state of high rotation if (￿￿￿￿) is set up highly, please be careful. A trip may occur according to load conditions.

Note 6: This parameter has a function similar to the DC braking function, which is activated by a command from the terminal board or an external control device (input terminal function ￿￿ or ￿￿, or command from external control device). To the DC braking function which will be activated if ￿￿￿￿ (jog run stop pattern) is set to ￿ (DC braking), and to the DC braking function which will be activated if ￿￿￿￿ (emergency stop pattern) is set to ￿ (DC braking), but it issues 0Hz commands instead of DC braking commands.

F-17