YASKAWA GA700 - Page 792

11.5 d: References
792 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Table 11.45 Torque Control Signal Polarity
Run Command Direction
Torque Reference Signal
Polarity
Direction of Motor Rotation
Polarity of the Internal
Torque Reference [U1-09]
Forward run + (Positive) Forward direction + (Positive)
- (Negative) Reverse direction - (Negative)
Reverse run + (Positive) Reverse direction - (Negative)
- (Negative) Forward direction + (Positive)
Note:
For Yaskawa motors, the forward run direction is counterclockwise direction when seen from the load shaft.
When you use analog inputs, you can get negative input values with these methods:
• Apply negative voltage input signals.
• Use positive voltage input signals and set the analog input bias to negative values.
• Apply positive voltage input signals and use a digital input programmed for Analog TorqueRef Polarity Invert
[H1-xx = 78].
When you use MEMOBUS/Modbus communication or a communication option card, set the positive or negative
signed torque reference.
When the level of the analog signal input is 0 V to 10 V or 4 mA to 20 mA, the torque reference is the forward
direction. To reverse the polarity of the torque reference, use one of these two methods:
• Use a -10 V to +10 V voltage input
• Set H1-xx = 78 [MFDI Function Select = Analog TorqueRef Polarity Invert].
■ Speed Limit and Speed Limit Bias
The drive reads the speed limit setting from the input selected in d5-03 [Speed Limit Selection]. You can use d5-
05 [Speed Limit Bias] to add a bias to this speed. Parameter d5-08 [Uni-directional Speed Limit Bias] sets how
the drive applies bias to the speed limit.
Table 11.46 shows the relation between these settings:
Table 11.46 Speed Limit, Speed Bias and Speed Limit Priority Selection
Operating Conditions
Run
command
Forward Reverse Forward Reverse Forward Reverse Forward Reverse
Torque
reference
direction
+ (Positive) + (Positive) - (Negative) - (Negative) - (Negative) - (Negative) + (Positive) + (Positive)
Speed limit
direction
+ (Positive) - (Negative) - (Negative) + (Positive) + (Positive) - (Negative) - (Negative) + (Positive)
Direction of
motor
rotation
Forward Reverse Forward Reverse
Generated
torque
(d5-08 = 0
[Disabled])
*1