Toshiba VF-A7 Protection functions, Motor over road protection-level adjust / motor types

Models: VF-A7

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6.25 Protection functions

6.25.1 Motor over road protectionlevel adjust / motor types

 Motor over road protection level #1

 Overload reduction start-up frequency

Refer to 5.13 for details.

6.25.2 Setting of current stall

 Stall prevention level

Mandatory

Warning

Do not set the stall prevention level() at a extremely small value.

If the stall prevention level() was set at a value that is near the motor's no load current or less, stall prevention function would work and output frequency would rise. In ordinary usage, do not set the stall prevention level at 30% or less.

Function

If the output current exceeds that set with , the stall protective function is a ctivated to reduce the output frequency.

[Parameter setting]

Title

Function

Adjustment range

Default setting



Stall prevention level

 [%], : Disabled



[Display during the alarm ]

When  is displayed (when the output current is on the point of exceeding ), the ou tput frequency displayed changes and a "" is displayed on the left side of the frequency.

Example of display



Note) In V/f constant control mode, the torque limits #1, #2, #3 and #4 can be used as a stall prevention. You can make various settings by combining these functions with the V/f1, 2, 3 and 4 functions.

6.25.3 Inverter trip holding

 Selection of inverter trip holding

Function

The function is to hold inverter's trip records. If this function is active, trip records are retained and can be displayed even after the inverter is reset.

[Parameter setting]

Title

Function

Adjustment range

Default setting



Selection of inverter trip holding

: Cleared if power is

turned off

 

 

: Hold even if power

is turned off

 

The last 4 trip records can be held and displayed in status monitor mode.

Trip data (current, voltage, etc. at the time of a trip) can be displayed in status monit or mode when the inverter trips, but is cleared if the power is turned off.

Inverter trip

Panel (terminal) reset Reset holding FL

Power source reset

 

Turn on power again

 

Fault display

FL not active

Ready for

normal operation

Trip again

Fault display

FL active

If the cause of tripping or that of another failure is not yet removed.

F-57

Page 148
Image 148
Toshiba VF-A7 Protection functions, Motor over road protection-level adjust / motor types, Setting of current stall