L6: Detection Of Overtorque/Undertorque - YASKAWA GA700 Technical Manual

11.9 L: Protection Function
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L5-05: Auto Restart Operation Selection
No.
Name
(Hex.)
L5-05 Auto Restart
Operation Selection
(0467)
0 : Continuous
Counts the number of successful fault resets via Auto Restart.
Once this count exceeds the value set in L5-01, a fault is output on the keypad, a fault signal is output, and the
motor coasts to stop.
1 : Use L5-04 Time
Counts the number of executed fault resets via Auto Restart, whether successful or not. The Auto Restart process
is repeated in intervals as set by L5-04 [Auto Restart Interval Time ].
Once this count exceeds the value set in L5-01, a fault is output on the keypad, a fault signal is output, and the
motor coasts to stop.
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L6: Detection of Overtorque/Undertorque

The overtorque/undertorque detection function is used to protect machinery and loads.
Overtorque is the state in which an excessive load is placed on the machine. When the motor current or output
torque reaches or exceeds the overtorque detection level and this state continues for at least the overtorque
detection time, an alarm is output, and the drive shuts off the output.
Undertorque is the state in which loads have suddenly decreased. When the motor current or output torque reaches
or falls below the undertorque detection level and this state continues for at least the undertorque detection time,
an alarm is output, and the drive shuts off the output.
The undertorque detection function can be used to detect the following states.
• Machine belt cuts
• Abnormal operation of the electromagnetic contactor on the drive output side
• Clogged output side air filters in fans and blowers
• Damage to blade tips and breakage of string
Note:
Drives may stop during overtorque conditions due to oC [Overcurrent] or oL1 [Motor Overload] occurs. To prevent the drive from
stopping, use torque detection to indicate an overload situation to the controller before oC or oL1 are detected by the drive. As with
undertorque conditions, use this function to detect issues that occur in the application.
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Parameter Settings
The two overtorque/undertorque detection functions can be set individually with this device. Set the parameters in
accordance with the following table.
Configuration Parameter
MFDO Function Select
• Terminals M1-M2
• Terminals M3-M4
• Terminals P1-C1
• Terminals P2-C2
Detection conditions and selection of
operation after detection
Detection Level
Detection Time
*1 The torque detection level can also be supplied by an analog input terminal. Set H3-xx = 7 [MFAI Function Select = Overtorque/
Undertorque DetectLvl] to enable this function. If both L6-02 and H3-xx = 7 are set, the analog input has priority and the setting of
L6-02 is disabled.
856
V/f CL-V/f OLV
Selects the count method for the Auto Restart operation.
Table 11.59 Overtorque/Undertorque Detection Settings Parameters
Overtorque/Undertorque Detection 1
H2-01, H2-02, H2-03, and H2-04 = B
N.O.: Turned on when detected
H2-01, H2-02, H2-03, H2-04 = 17
N.C.: Turned off when detected
L6-01
L6-02
Analog Input Terminal
H3-xx = 7
L6-03
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
CLV AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
*1
Overtorque/Undertorque Detection 2
H2-01, H2-02, H2-03, H2-04 = 18
N.O.: Turned on when detected
H2-01, H2-02, H2-03, H2-04 = 19
N.C.: Turned off when detected
L6-04
L6-05
-
L6-06
Default
(Range)
0
(0, 1)