Abnormal Speed Detection; Overvoltage Limit Operation; Undervoltage Trip - Toshiba TOSVERT VF-AS1 Instruction Manual

6.33.13 Abnormal speed detection

 : Abnormal speed detection time
 : Overspeed detection frequency upper band
 : Overspeed detection frequency lower band
• Function
These parameters allow you to set the inverter so that, when it is in sensor speed control mode (=,
), it always monitors the rotational speed of the motor, even when the motor is at rest, and if the speed
remains out of the specified limits for the specified length of time, it outputs an error signal.
Title



Output frequency [Hz]
6
Note 1: This function doesn't operate at the time of a torque control.
Note 2: It is advisable to set the parameter  (Acceleration/deceleration operation after torque limit) to  when
this function is set.

6.33.14 Overvoltage limit operation

 : Overvoltage limit operation level
⇒ For more details, refer to Section 6.14.2.

6.33.15 Undervoltage trip

 : Undervoltage detection level
 : Undervoltage trip selection
 : Undervoltage (trip alarm) detection time
• Function
This parameter is used for selecting the control mode when an undervoltage is detected. (Invalid, while the
inverter stops.) When selecting "tripping enabled," you can also specify the time elapsed before the inverter trips.
=: (Disabled) ··············· Inverter stops,but does not trip. (FL is not active.)
=: (Enabled) ················ The inverter trips  if an undervoltage passes for the time set with  or
Title



Function
Abnormal speed detection time
Overspeed detection frequency upper band
Overspeed detection frequency lower band
0

over. (FL is activated.)
Function
Undervoltage detection level
Undervoltage trip selection
Undervoltage (trip alarm) detection time
Adjustment range
~ sec.
: Disabled, ~  H z
: Disabled, ~  H z
Output frequency
 trip

Adjustment range
~ % for 500V class.
~ % for 575V class
~ % for 690V class
,  %: (auto mode)
: Disabled, : Enabled
~ sec.
F-60
E6581528
Default setting





Time [s]
Default setting
According to voltage
class ⇒ Refer to page
K-23.

