Toshiba Tosvert VF-S15 Instruction Manual page 221

=: Inverter is stopped. However, it is not tripped (Failure signal FL not activated). The inverter stop
(Failure signal FL not activated.), only after detection of a voltage not exceeding 50% of its rating.
Be sure to connect the input AC or DC reactor specified in section 10.4.
[Parameter setting]
Title
Undervoltage trip/alarm
f627
selection
6.29.14 Analog input break detection
f633 : Analog input break detection level (VIC)
f644 : Operation selection of analog input break detection (VIC)
f649 : Fallback frequency
 Function
The inverter will trip if the VIC value remains below the specified value for about 0.3 seconds. In such
a case, trip " e-18 " and alarm " al05 " is displayed.
f633 =0: Disabled....Not detected.
f633 =1-100....The inverter will trip if the VIC input remains below the specified value for about 0.3 seconds.
[Parameter setting]
Title
Analog input break detection level
f633
(VIC)
Operation selection of analog input
f644 
break detection (VIC)
f649  Fallback frequency
Note : The VIC input value may be judged earlier to be abnormal, depending on the degree of deviation of
the analog data detected.
Function
0: Alarm only
(detection level 60% or less)
1: Tripping
(detection level 60% or less)
2: Alarm only
(detection level 50% or less, input
AC or DC reactor required)
3: -
Function
F-109
Adjustment range
Adjustment range
0: Disabled
1-100%
0: Tripping
1: Alarm only (Coast stop)
2: Alarm only ( f649 frequency)
3: Alarm only (Maintain running)
4: Alarm only (Deceleration stop)
ll - ul (Hz)
E6581926
Default setting
0
6
Default setting
0
0
0.0