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
Factory setting: 0
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.
Operation
Overtorque
After
Detection
Setting
Disabled
Detection
Condition
0
Disabled
——
——
1
Overtorque
Continues
Only at set frequency
2
Overtorque
Coast to stop
Only at set frequency
3
Overtorque
Continues
At all times except during
stopping or DC injection braking
4
Overtorque
Coast to stop
At all times except during
stopping or DC injection braking
—
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
displays 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
Factory setting: 160 %
Range: 30 to 200 %
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
Factory setting: 0
During Open Loop Vector Control
This parameter is only effective when the drive is in the Open Loop Vector control method.
D.
n099 : Overtorque / Undertorque Detection Time
Factory setting: 0.1 sec.
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
warning or fault display.
5-31
5.20 OVERTORQUE DETECTION
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)
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