Instruction manual

125
 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 function
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 1 (n177)
(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 operator displays the "UL3" alarm (blinking).
(3) To halt the inverter by a fault at undertorque detection, set to 2 or 4. At
detection, the operator displays the "UL3" fault (continuously lit).
TIME
n119n119
ONON
MOTOR CURRENT
n118
MULTI-FUNCTION OUTPUT TERMINAL
(UNDERTORQUE DETECTION SIGNAL)
MA, MB, P1, P2
* *
Setting Description
0
1
Undertorque detection not provided.
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.