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5.8 L: Protection Functions
312
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
Setting 5: UL3, UL4 at speed agree (Alarm)
Undertorque detection is active only when the output speed is equal to the frequency reference, i.e., no detection during
acceleration and deceleration. The operation continues after detection and a UL3 or UL4 alarm is triggered.
Setting 6: UL3, UL4 at Run (Alarm)
Undertorque detection works as long as the Run command is active. The operation continues after detection and a UL3 or
UL4 alarm is triggered.
Setting 7: UL3, UL4 at Speed Agree (Fault)
Undertorque detection is active only when the output speed is equal to the frequency reference, i.e., no detection during
acceleration and deceleration. The operation is stopped and a UL3 or UL4 fault is triggered.
Setting 8: UL3, UL4 at run (Fault)
Undertorque detection works as long as a Run command is active. Operation stops and a UL3 or UL4 fault is triggered.
■
L6-02, L6-05: Torque Detection Level 1, 2
These parameters set the detection levels for the torque detection functions 1 and 2. In V/f and OLV/PM control modes
these levels are set as a percentage of the drive rated output current, while in vector control modes these levels are set as
a percentage of the motor rated torque. When Mechanical Weakening detection is enabled (L6-08
≠
0), the level for
L6-02 is set as a percentage of the drive’ rated output current in all control modes.
Note:
The torque detection level 1 (L6-02) can also be supplied by an analog input terminal set to H3-
= 7. Here, the analog value
has priority and the setting in L6-02 is disregarded. Torque detection level 2 (L6-05) cannot be set by an analog input.
■
L6-03, L6-06: Torque Detection Time 1, 2
These parameters determine the time required to trigger an alarm or fault after exceeding the levels in L6-02 and L6-05.
■
Mechanical Weakening Detection
This function can be used to detect mechanical weakening of a machine that leads to overtorque or undertorque situations
after a certain machine operation time has elapsed.
The function is activated in the drive when the cumulative operation counter U4-01 exceeds the time set in parameter
L6-11. Mechanical Weakening Detection uses the torque detection 1 settings (L6-01, L6-02, L6-03) and triggers an oL5
or UL5 fault when overtorque or undertorque occurs in the speed range determined by parameter L6-08 and L6-09. The
oL5 or UL5 operation is set by parameter L6-08.
To output a signal for Mechanical Weakening Detection, set H2-
to 22.
■
L6-08: Mechanical Weakening Detection Operation
Sets the speed range to detect mechanical weakening and the action to take when mechanical weakening is detected.
Setting 0: Disabled
Setting 1: Continue running if the speed is greater than L6-09 (signed) (Alarm)
Detection when the speed is above L6-09 (signed). Upon detection operation continues, but an oL5 alarm is output.
Setting 2: Continue running if the speed is greater than L6-09 (Alarm)
Detection when the speed is above L6-09 (unsigned). Upon detection operation continues, but an oL5 alarm is output.
No.
Name
Setting Range
Default
L6-02
Torque Detection Level 1
0 to 300%
150%
L6-05
Torque Detection Level 2
0 to 300%
150%
No.
Name
Setting Range
Default
L6-03
Torque Detection Time 1
0.0 to 10.0 s
0.1 s
L6-06
Torque Detection Time 2
0.0 to 10.0 s
0.1 s
No.
Name
Setting Range
Default
L6-08
Mechanical Weakening Detection Operation
0 to 8
0
SIEP_C710636_02B_1_0.book 312 ページ 2015年11月25日 水曜日 午後4時56分