YASKAWA FSDrive-MV1000 Parameter Manual page 216

2.8 L: Protection Functions
u L7: Torque Limit
The torque limit function limits the torque in each of the four quadrants individually to protect the machinery. It can be
used in OLV and CLV control modes. The limit can be either set by parameters or by analog inputs. A contact output
programmed for "During torque limit" (H2-01, H2-02, H2-03 = 30) can be switched when the drive is operating at the
torque limit.
Setting Torque Limits
n
The torque limits are defined by parameters L7-01 to L7-04 for each of the four operation quadrants. Analog inputs can
also be used to either define a general limit for all operation conditions (H3-02, H3-06, H3-10 = 15) or for setting
separate limits for each operation condition (H3-02, H3-06, H3-10 = 10, 11, or 12).
settings is applied in each quadrant.
If two limit values are defined for the same operation conditions, the drive will use the lower value.
Note: The maximum output torque is ultimately limited by the drive output current (max. 150% of drive rated current in HD, 120% in
ND). Output torque will not exceed the limit set for the drive rated current, even if the torque limits are set to higher values.
Example: If parameter L7-01 = 130%, L7-02 to L7-04 = 200%, and a general torque limit of 150% is set by an analog
input (H3-02, H3-06, H3-10 = 15), then the torque limit in quadrant 1 will be 130%, but 150% in all other quadrants.
Figure 2.79
REV motor rotation
L7-01 to L7-04: Torque Limits
n
A setting of 100% is equal to the motor rated torque.
No.
L7-01
L7-02
L7-03 Forward Regenerative Torque Limit
L7-04 Reverse Regenerative Torque Limit
Note: If the analog input is programmed for "10: Forward torque limit", "11: Reverse torque limit", "12: Regenerative torque limit", or
"15: General torque limit", the drive uses the lower value in L7-01 through L7-04, or analog input torque limit.
216
positive torque reference
REV run regenerative
10: Positive Torque Limit
12: Regenerative Torque Limit
15: Torque Limit
Parameter L7-04
quadrant 2
quadrant 3
11: Negative Torque Limit
15: Torque Limit
Parameter L7-02
REV run motoring
negative torque reference
Figure 2.79 Torque Limit Parameters and Analog Input Settings
Name
Forward Torque Limit
Reverse Torque Limit
FWD run motoring
10: Positive Torque Limit
15: Torque Limit
Parameter L7-01
quadrant 1
quadrant 4
11: Negative Torque Limit
12: Regenerative Torque Limit
15: Torque Limit
Parameter L7-03
FWD run regenerative
Setting Range
0 to 300%
0 to 300%
0 to 300%
0 to 300%
YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide
Figure 2.79 shows which of the limit
FWD motor rotation
Default
100%
100%
1%
1%