Toshiba Tosvert VF-S15 Instruction Manual page 220

6.29.6 Input phase failure detection
f608 : Input phase failure detection selection
 Function
f608=0: No tripping. (Failure signal FL not activated)
f608=1: Phase failure detection is enabled during operation. The inverter will trip if the abnormal voltage
[Parameter setting]
Title
f608
6
Note1: Setting  to  (input phase failure detection: disabled) may result in a breakage of the
Note2: Parameter f608 is invalid for single-phase input model.
Note3: When operating the inverter with DC input, set f608=0 (none).
This parameter detects inverter input Phase failure. If the abnormal voltage status of main circuit
capacitor persists for few minutes or more, the tripping function and the failure signal FL will be
activated. Trip display is eph1. Detection may not be possible when operating with a light load, or
when the motor capacity is smaller than the inverter capacity.
If the power capacity is larger than the inverter capacity (more than 500kVA or more than 10 times),
detection errors may occur. If this actually happens, install an AC or DC reactor .
status of main circuit capacitor persists for few minutes or more. (Failure signal FL activated)
Function
Input phase failure detection selection
capacitor in the inverter main circuit if operation is continued under a heavy load in spite of the
occurrence of an input phase failure.
Adjustment range
0: Disabled
1: Enabled
F-108
E6582175
Default setting
1