Instruction manual

153
4
PARAMETERS
When the Pr. 250 value is 8888, the functions of terminals STF and STR change as
shown below:
STF = start signal, STR = rotation direction signal
When the Pr. 250 value is any of 1000 to 1100s, the functions of terminals STF and STR
are the same as when the Pr. 250 value is 8888.
Also, for the stopping method used when the start signal switches off, the output is shut
off (the motor coasts to a stop) after the period set in Pr. 250 (i.e. 1000s) have elapsed.
4.2.47 Output phase failure protection selection (Pr. 251)
Pr. 251 "Output phase failure protection selection"
You can make invalid the output phase failure protection (E.LF) function which stops the
inverter output if one of the three phases (U, V, W) on the inverter's output side (load
side) becomes open.
Choose "without output phase failure protection" when the motor capacity is smaller
than the inverter capacity (when the output current is less than approximately 25% of
the rated inverter current value as a guideline), since performing operation in such a
case may activate output phase failure protection.
STF STR Inverter Operating Status
OFF OFF
Stop
OFF ON
ON OFF Forward rotation
ON ON Reverse rotation
Note:1. The RUN signal switches off when the output stops.
2. When the start signal is switched on again during motor coasting, the motor
starts at 0Hz.
3. When the Pr. 250 value is 0, the output is shut off within the shortest time.
Parameter
Number
Setting
Range
Minimum
Setting
Increments
Factory
Setting
Description
251 0, 1 1 1
0: Without output phase failure
protection
1: With output phase failure
protection
Pr. 254  Refer to Pr. 73
Pr. 342  Refer to Pr. 117
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