YASKAWA V7 Technical Manual page 110

5.34 UNDERTORQUE DETECTION
— For undertorque detection during accel or decel, set to " 3 " or " 4 ".
— For continuous operation after undertorque detection, set to " 1 " or " 3 ". During detection, the Digital Operator
displays and " UL3 " alarm (blinking).
— To stop the drive at an undertorque detection fault, set to " 2 " or " 4 ". At detection, the Digital Operator displays an
" UL3 " fault.
— To output an undertorque detection signal, set output terminal function selection (n057, n058 or n059 ) to
" 8 " or " 9 ".
B. n118 : Undertorque Detection Level
This is the reference point for determining that an undertorque condition exists. Set as a percent of Drive rated
current or as a percent of motor rated torque.
C. n119 : Undertorque Detection Time
Determines how long an undertorque condition must exist before another event will occur, e.g. coast to stop,
multi-function output change of state, or UL3 warning or fault display.
D.
n057 : Multi-function Output 1
(terminals MA, MB & MC)
n058 : Multi-function Output 2
(terminals P1 & PC)
n059 : Multi-function Output 3
(terminals P2 & PC)
A Form-C contact, or an open collector output, can be programmed to change states during an
overtorque/undertorque detection condition.
n096 setting:
n057 setting:
n096 setting:
n099 setting:
Detection level
(n098 )
OUTPUT
CURRENT/
TORQUE
MOTOR
SPEED
RUN
SIGNAL
FAULT
SIGNAL
CONTACT OUTPUT
(OVERTORQUE
DETECTION)
TERM. MA & MC)
Continued
EXAMPLE OF OVERTORQUE DETECTION
2 — Overtorque enabled, only at set frequency, coast to stop
6 — Output contact programmed for overtorque detection
110 % — Level at which overtorque is sensed
1.0 s — Time delay before overtorque event occurs
110%
100%
0
100%
0
Overtorque Detection Timing Diagram
Factory setting: 10 %
Range: 0 to 200 %
Factory setting: 0.1 sec.
Range: 0.1 to 10.0 seconds
5-58
Data 6 or 7 : Overtorque
Detection
Data 8 or 9 : Undertorque
Detection
Detection
time
(n099)
Coast
stop