Undertorque Detection - Omron VARISPEED V7 User Manual

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 func-
tion selection in n057, n058, or n059 to 8 (undertorque detected, NO
contact) or 9 (undertorque detected, NC contact).
Motor Current
n118
Multi-function Output
Terminal (Undertorque
Detection Signal)
MA, MB, P1, P2
* Undertorque detection release width (hysteresis) is set at approx. 5 % of the
Inverter's rated current.
Undertorque Detection Function Selection 1 (n117)
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.
During 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).
6 Programming Features
ON
n119
Description
Time
ON
n119
185