Overtorque Detection - YASKAWA V7 Technical Manual

5.20 OVERTORQUE DETECTION

Overtorque detection is used to compare Drive rated output current/torque 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 fault on the Digital Operator. This feature can be
selected to operate over a wide range of conditions.
A. n096 : Overtorque Detection
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.
Setting
0
1
2
3
4
— For overtorque detection during accel or decel, set to " 3 " or " 4 ".
— For continuous operation after overtorque detection, set to " 1 " or " 3 ". During detection, the Digital Operator dis-
plays and " oL3 " alarm (blinking).
— To stop the drive at an overtorque detection fault, set to " 2 " or " 4 ". At detection, the Digital Operator displays an
" oL3 " fault.
— To output an overtorque detection signal, set output terminal function selection (n057, n058 or n059 ) to
" 6 " or " 7 ".
B. n098 : Overtorque Detection Level
This is the reference point for determining that an overtorque condition exists. Set as a percent of
Drive rated current or as a percent of motor rated torque.
C. n097 : Overtorque Detection Selection
During Open Loop Vector Control
Setting Description
0 Detected by motor output torque (as a percentage of motor rated torque)
1 Detected by drive output current (as a percentage of drive rated current)
This parameter is only effective when the drive is in the Open Loop Vector control method.
D. n099 : Overtorque / Undertorque Detection Time
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
Operation
Overtorque After
Disabled Detection
Disabled
Overtorque Continues
Overtorque Coast to stop
Overtorque Continues
Overtorque Coast to stop
Factory setting: 0
Detection
Condition
—— ——
Only at set frequency
Only at set frequency
At all times except during
stopping or DC injection braking
At all times except during
stopping or DC injection braking
Factory setting: 160 %
Range: 30 to 200 %
Factory setting: 0
Factory setting: 0.1 sec.
Range: 0.0 to 10.0 seconds
oL3
warning or fault display.
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