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Operation selection function 2 (Pr. 65 to Pr. 79)
PARAMETERS
3
3.11.7 Reverse rotation prevention selection (Pr. 78 )
<Setting>
3.11.8 Operation mode selection (Pr. 79 )
This function can prevent any reverse rotation fault resulting from the mis-input of the start signal.
POINT
Used for a machine that runs only in one direction, e.g. fan, pump.
(The setting of this parameter is valid for combined operation, PU operation, external operation and
communication operation.)
Parameter Name Factory Setting Setting Range Remarks
78
Reverse rotation prevention
selection
0 0, 1, 2 Extended mode
Control
Method
Pr. 78 Setting
Start Signal
Limit on Analog Reversible
STF STR
Speed
control
V/F control
0 Valid Valid
Negative input starts rotation in the direction
opposite to that of start signal
1
(reverse rotation lock)
Valid Invalid
Negative input does not start rotation.
2
(forward rotation lock)
Invalid Valid
Torque
control
0 Valid Valid
Negative input starts rotation in the direction
opposite to that of start signal
1
(reverse rotation lock)
Valid Invalid
Negative analog input results as follows.
2
(forward rotation lock)
Invalid Valid
Position
control
0
Functions as a stroke signal
and motor does not rotate in
the direction where the STF or
STR signal does not exist.
Under position control, analog command is
irrelevant to the forward/reverse rotation lock
function as it does not function in other than torque
limit setting (absolute value used for operation).
1
(reverse rotation lock)
Motor does not rotate in the
reverse rotation direction.
2
(forward rotation lock)
Motor does not rotate in the
forward rotation direction.
Used to select the operation mode of the inverter.
The inverter can be run from the control panel or parameter unit (PU operation), with external signals
(external operation), or by combination of PU operation and external operation (external/PU combined
operation).
The external operation mode is selected at power on (factory setting).
Parameter Name Factory Setting Setting Range
79 Operation mode selection 0 0 to 4, 6 to 8
speed torque position
Speed Operation
Starting speed or less No rotation
When rotation is in the
same direction as that of
start signal and speed is
higher than starting speed
Torque in the
direction opposite to
that of start signal is
generated.
speed torque position