YASKAWA E7U Programming Manual page 72

Function: Remote/Auto Operation
Setting: A
When an output is configured as a Remote Operation output, the output will close to show that the Run command is being
sourced from the digital operator. If the Remote Operation output is open, it indicates the Run command is coming from the
control circuit terminals or an optional communications card.
Function: Trq Det 1 N.O.
Setting: B
The Trq Det 1 function ties a digital output to the overtorque/undertorque sensing capabilities of the Drive. If a digital output
is configured as Trq Det 1 N.O., whenever the output current differs from the level of L6-02 for at least the length of time set
in L6-03, the digital output will close.
The torque detection function has a built-in hysteresis of 10% of the Drive rated output current.
Undertorque Detection
Signal
Output Current
Function: Loss of Reference
Setting: C
The Loss of Reference configured digital output will close when the Drive has detected a loss of the analog speed command.
The speed command is considered lost when the voltage level drops 90% in 0.4 seconds. Parameter L4-05 determines the
Drive's reaction to a loss of reference state in addition to turning on the Loss of Reference digital output.
The Loss of Reference digital output will only initiate if the Drive is configured for the speed command to be via one of the
analog inputs (A1 or A2).
Analog
Speed Command
Loss of
Reference
Output
L6-03
..................
Fig. 44 Trq Det 1 N.O. Timing Diagram
T
Fig. 45 Loss of Reference Function Characteristics
Programming 66
L6-01 = 5,6,7, or 8
L6-02 = TD Level 1
L6-03 = TD Delay Time 1
b = 10% of Drive rated current
t
b
L6-02
t
TIME
TIME
ON (Closed)
OFF (Open)
100%
80%
10%
T = 400ms
ON (Closed)
OFF (Open)
t