YASKAWA GA700 Technical Manual page 684

11.5 d: Reference Settings
Note:
For Yaskawa motors, the forward run direction is the counter clockwise direction when viewed from the load shaft.
When using analog inputs, negative input values can be generated by:
• applying negative voltage input signals.
• using positive voltage input signals while setting the analog input bias to negative values.
• applying positive voltage input signals and using a digital input that is programmed for H1-xx = 78 [MFDI
Function Select = Ex.Torque Ref Polarity Inversion].
When using 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 input a reverse direction for torque reference, use either of the following.
• Use a -10 V to 10 V voltage input
• Switch the polarity of the torque reference by setting the H1-xx=78 [MFDI Function Select = Ex.Torque Ref
Polarity Inversion].
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Speed Limit and Speed Limit Bias
The speed limit setting is read from the input selected in d5-03 [Speed Limit Selection]. A bias can be added to
this speed limit using d5-05 [Speed Limit Bias]. Parameter d5-08 [Unidirectional Speed Limit Bias] determines
how bias is applied to the speed limit.
The following table explains the relation between these settings.
Table 11.35 Speed Limit, Speed Bias and Speed Limit Priority Selection
Run Forward
command
Torque + (Positive)
reference
direction
Speed limit + (Positive)
direction
Direction of Forward
motor
rotation
Generated
torque
(d5-08 = 0
[Disabled])
*1
Generated
torque
(d5-08 = 1
[Enabled])
*1
Application
example
*1 The Δn value is determined by the C5 parameter setting.
684
Reverse Forward
+ (Positive) - (Negative)
- (Negative) - (Negative)
Reverse
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Operating Conditions
Reverse Forward
- (Negative) - (Negative)
+ (Positive) + (Positive)
Forward
Reverse Forward
- (Negative) + (Positive)
- (Negative) - (Negative)
Reverse
Reverse
+ (Positive)
+ (Positive)