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3. SIGNALS AND WIRING
(b) Analog torque command offset
Using parameter No.PC38, the offset voltage of
999 to 999mV can be added to the TC applied
voltage as shown below.
0
8( 8)
Max. torque
Generated torque
TC applied voltage [V]
Parameter No. PC38 offset range
999 to 999mV
(2) Torque limit
By setting parameter No.PA11 (forward rotation torque limit) or parameter No.PA12 (reverse rotation torque
limit), torque is always limited to the maximum value during operation. A relationship between limit value
and servo motor torque is as in section 3.6.1 (5). Note that the analog torque limit (TLA) is unavailable.
(3) Speed limit
(a) Speed limit value and speed
The speed is limited to the values set in parameters No.PC05 to PC11 (internal speed limits 1 to 7) or
the value set in the applied voltage of the analog speed limit (VLA).
A relationship between the analog speed limit (VLA) applied voltage and the servo motor speed is
shown below.
When the servo motor speed reaches the speed limit value, torque control may become unstable. Make
the set value more than 100r/min greater than the desired speed limit value.
Forward rotation (CCW)
Reverse rotation (CW)
-10
Rated speed [r/min]
CCW direction
0+10
VC applied voltage [V]
CW direction
Rated speed
Speed[r/min]
The following table indicates the limit direction according to forward rotation selection (RS1) and reverse
rotation selection (RS2) combination.
(Note) Input device Speed limit direction
RS1 RS2
Analog speed limit (VLA)
Internal speed
commands
Polarity Polarity
1 0 CCW CW CCW
0 1 CW CCW CW
Note. 0: off
1: on