6. Programming Features
153
Undertorque Detection
An alarm signal can be output to a multi-function output terminal (MA,
MB, P1 or P2) when the load on the machine side suddenly becomes
lighter (i.e., when an undertorque occurs).
To output an undertorque detection signal, set the output terminal funci-
ton selection in n057, n058, or n059 to 8 (undertorque detected, NO
contact) or 9 (undertorque detected, NC contact).
* Undertorque detection release width (hysteresis) is set at approx. 5 % of the
Inverter’s rated current.
Undertorque Detection Function Selection (n177)
1. To detect undertorques during acceleration, set to 3 or 4.
2. To continue operation after undertorque detection, set to 1 or 3. Dur-
ing detection, the operation displays the “UL3” alarm (flashing).
3. To halt the Inverter by a fault at undertorque detection, set to 2 or 4.
At detection, the Operation displays the “UL3” fault (continuously
lit).
Setting Description
0 Undertorque detection not provided.
1 Detected during constant-speed running. Operation continues
after detection.
2 Detected during constant-speed running. Operation stops.
3 Detected during running. Operation continues after detection.
4 Detected during running. Operation stops.
n119
n118
n119
ON
ON
Multi-function Output
Terminal (Undertorque
Detection Signal)
MA, MB, P1, P2
Time
Motor Current
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