Overtorque detection is used to compare drive rated output current with the overtorque
detection level. When the output current is equal to or greater than the defined level, an
overtorque condition exists. This will be indicated as an "oL3 Overload 3 " fault on the
Digital Operator. This feature can be selected to operate over a wide range of conditions.
A. n077 : Overtorque / Undertorque Detection Factory setting: 0
(Torq Det Sel)
This constant determines whether the overtorque detection function of the drive is
enabled, under what conditions it will detect for overtorque, and what operation it will
perform after detecting an overtorque.
— For overtorque detection during accel or decel, set to "OT/RUN Alm" (" 2 ") or "OT/RUN/Flt" (" 4 ").
— For continuous operation after overtorque detection, set to "OT/Spd Agree/Alm (" 1 ") or
"OT/RUN/Alm" (" 2 "). During detection, the Digital Operator displays and " oL3 Overload 3 "
alarm (blinking).
— To stop the drive at an overtorque detection fault, set to "OT/Spd Agree/Flt" (" 3 ") or "OT/RUN/Flt"
(" 4 "). At detection, the Digital Operator displays an " oL3 Overload 3 " fault.
— To output an overtorque detection signal, set output terminal function selection (n41 or n42) to
"OverTrq Det (NO)" (" 6 ") or "OverTrq Det (NC)" (" 7 ").
B. n078 : Overtorque / Undertorque Detection Level Factory setting: 160 %
(Torq Det Level)
Range: 30 to 200 %
This is the reference point for determining that an overtorque condition exists. Set as a
percent of drive rated current (see Appendix 2).
C. n079 : Overtorque / Undertorque Detection Time Factory setting: 0.1 sec.
(Torq Det Time)
Range: 0.0 to 10.0 seconds
Determines how long an overtorque condition must exist before another event will occur,
e.g. coast to stop, multi-function output change of state, or "
oL3 Overload 3" warning
or fault display.
5-43
5.21 OVERTORQUE / UNDERTORQUE DETECTION
Overtorque / Operation
Undertorque After Detection
LED Setting LCD Setting Disabled Detection Condition
0* Disabled* Disabled —— ——
1 OT/SpdAgree/Alm Overtorque Continues Only at set frequency
2 OT/RUN/Alm Overtorque Continues At all times except during
stopping or DC injection braking
3 OT/SpdAgree/Flt Overtorque Coast to stop Only at set frequency
4 OT/RUN/Flt Overtorque Coast to stop At all times except during
stopping or DC injection braking
5 UT/SpdAgree/Alm Undertorque Continues Only at set frequency
6 UT/RUN/Alm Undertorque Continues At all times except during
stopping or DC injection braking
7 UT/SpdAgree/Flt Undertorque Coast to stop Only at set frequency
8 UT/RUN/Flt Undertorque Coast to stop At all times except during
stopping or DC injection braking
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