Torque detection 1 (level and timer)
Torque detection 2/low torque detection (level and timer)
E78 specifies the operation level and E79 specifies the timer, for the output signal “TD1”. E80 specifies the
operation level and E81 specifies the timer, for the output signal “TD2” or “U-TL”.
In the inverter’s low frequency operation, as a substantial error in torque calculation occurs, no low torque can be
detected within the operation range at less than 20% of the base frequency (F04). (In this case, the result of
recognition before entering this operation range is retained.) The U-TL signal goes off when the inverter is stopped.
Since the motor parameters are used in the calculation of torque, it is recommended that auto-tuning be applied by
function code P04 to achieve higher accuracy.
Output signal Assigned data
Detection level Timer
Range: 0 to 300% Range: 0.01 to 600.00 s
“TD1” 46 E78 E79
“TD2” 47 E80 E81
“U-TL” 45 E80 E81
■ Torque detected 1 – “TD1”, Torque detected 2 – “TD2”
The output signal TD1 or TD2 comes ON when the torque value calculated by the inverter or torque command
exceeds the level specified by E78 or E80 (Torque detection (Level)) for the period specified by E79 or E81
(Torque detection (Timer)), respectively. The signal turns OFF when the calculated torque drops below “the level
specified by E78 or E80 minus 5% of the motor rated torque.” (The minimum ON-duration is 100 ms.)
■ Low torque detected – “U-TL”
This output signal comes ON when the torque value calculated by the inverter or torque command drops below the
level specified by E80 (Low torque detection (Level)) for the period specified by E81 (Low torque detection (Timer)).
The signal turns OFF when the calculated torque exceeds “the level specified by E78 or E80 plus 5% of the motor
rated torque.” (The minimum ON-duration is 100 ms.)
E98, E99
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