Chapter 6: Programming Features
Firmware – S2011 and S3012
Revision: 1 (9/98) 43 © Saftronics, Inc.
6.3.9 Torque Detection
If an excessive load is applied to the machine, output current increase can be detected by output alarm signals at multi-
function contact output Terminals MA, MB and M1.
To output an overtorque detection signal, set multi-function contact output selection n040 or n041 to “overtorque
detection” [Setting: 6 (NO contact) or 7 (NC contact)].
∗ Release width (hysteresis) during overtorque detection is 5% of the level of Inverter current.
Figure 28 Torque Characteristics
§ Overtorque Detection Function Selection (n074)
Setting Description
0 Detection disabled (Factory setting).
1 Detected during constant-speed running, and operation continues after detection.
2 Detected during running, and operation continues after operation.
3
Detected during constant-speed running, and Inverter output is shut OFF during
detection.
4 Detected during running, and Inverter output is shut OFF during detection.
1. To detect overtorque during acceleration or deceleration, set to 2 or 4.
2. To continue the operation after overtorque detection, set to 1 or 2. During detection, the Digital Operator
displays “OL3” alarm (blinking).
3. To halt the Inverter by a fault at overtorque detection, set to 3 or 4. At detection, the Digital Operator displays
“OL3” fault (ON).
§ Overtorque Detection Level (n075)
Sets the overtorque detection current level in units of 1%. (Inverter rated current: 100%) Factory setting: 160%
§ Overtorque DetectionTime (n076)
If the time when motor current exceeds the overtorque detection level (n075) is longer than overtorque detection time
(n076), the overtorque detection function operates. Factory setting: 0.1 seconds
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