YASKAWA Varispeed V7 Instruction Manual page 201

Undertorque Detection
An alarm signal can be output to a multi-function output terminal (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).
Multi-function Output
Terminal (Undertorque
Detection Signal)
P1, P2
* Undertorque detection release width (hysteresis) is set at approx. 5 % of the
Inverter's rated current.
Undertorque Detection Function Selection (n177)
Setting
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.
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).
200
Motor Current
n118
n119
ON
Description
Time
ON
n119