E6581301

Output frequency [Hz]

Set frequency

DC braking start frequency ￿￿￿￿

0

Output current [A]

0

Note:During DC braking, the DC braking

 

current may be adjusted

LED display

automatically to prevent the

overload protection function from

 

￿￿ displayed

being activated and causing the

DC braking

inverter to trip.

 

The DC braking current may be

 

 

adjusted automatically to prevent

 

tripping.

 

 

When the inverter is used with a

 

standard motor, setting the

 

percentage of DC braking (￿￿￿￿)

 

above 60% may activate the thermal

 

protection function to prevent the

Time [s]

motor from being overloaded,

depending on the setting of ￿￿￿￿

 

(DC braking time).

DC braking current

￿￿￿￿

DC braking time

￿￿￿￿

 

Operation signal (F-CC) (SW1 set to sink logic)

ON

OFF

<DC braking start conditions>

The forward/reverse DC braking priority control function ￿￿￿￿ recognizes certain conditions such as stop commands from the inverter, and is activated when the output frequency goes down below the DC braking start frequency set with ￿￿￿￿. In this case, the conditions under which DC braking starts include not only the issue of a start or stop command from the operation panel or an external input device, but also a fall in the reference frequency below the value set with ￿￿￿￿ (stop frequency setting) or a fall in the output frequency below the operation stop frequency setting ￿￿￿￿.

[DC braking under normal conditions] (Forward/reverse run DC braking priority control ￿￿￿￿=￿ [Disabled])

6

Output frequency [Hz]

Set frequency

￿￿￿￿

0

Reference frequency

￿￿￿￿

~ ~

￿￿￿￿

￿￿￿￿ ￿

: DC braking

 

~ ~

 

Time [s]

￿￿￿￿

￿￿￿￿

0

Operation signal (F-CC) (SW1 set to sink logic)

(1)

(2)

(2)

~ ~

 

~ ~

~ ~

 

~ ~

(3)

ON

OFF

(1)

If ￿￿￿￿ and ￿￿￿￿ > reference frequency

: DC braking

(2)

If ￿￿￿￿ > reference frequency > ￿￿￿￿￿

: Operation at the command frequency

 

If ￿￿￿￿ and ￿￿￿￿ > reference frequency

: DC braking

(3)

If an operation command is entered during DC braking

: DC braking is discontinued to restart the operation.

F-15

Page 131
Image 131
Toshiba VF-AS1 instruction manual ~ ~