Hitachi WJ200-001S Instruction Manual page 147

362
Torque Limit Function
Torque limit function allows you to limit the motor output when  (SLV) is set for the
V/F characteristics set at parameter . You can select one of the following modes
with the torque limit selection ().
(1) Quadrant-specific setting mode (=)
In this mode, individual torque limit value to be applied to four quadrants (i.e.
forward
regeneration) are set as the torque limits 1 to 4 ( to ), respectively.
(2) Terminal-switching mode(=)
In this mode, the torque limit values set in the torque limits 1 to 4 ( to )
are switched from one another according to the combination of the states of torque
limit switch terminals 1 and 2 (TRQ1 and TRQ2) assigned to intelligent input
terminals. A single selected torque limit is valid in all the operating states.
(3) Analog voltage input mode(=)
In this mode, the torque limit value is set by a voltage applied to the control circuit
terminal O. The voltage range 0 to 10V corresponds to the torque limit value range
0 to 200%. A single selected torque limit is valid in all the operating states.
If parameter " (TL: whether to enable torque limitation)" has been assigned to any
intelligent input terminal, the torque limit mode selected by the setting of  is
enabled only when the TL terminal is turned ON. When the TL terminal is turned OFF,
torque limit settings are invalid, and the maximum torque setting is applied as a torque
limit.
It the TL function has not been assigned to the intelligent input terminal, the torque
limit mode selected by the setting of  is always enabled.
Each torque limit value used for this function is expressed as a ratio of the maximum
torque generated when the inverter outputs its maximum current on the assumption
that the maximum torque is 200%.
Note that each torque limit value does not represent an absolute value of torque. The
actual output torque varies depending on the motor.
It the torque limited signal function (TRQ) is assigned to an intelligent output terminal,
the TRQ signal will turn ON when the torque limit function operates.
100% torque is referred to inverter rated current. Absolute torque value is up the motor
to be combined.
powering, reverse regeneration, reverse powering and forward